United States

Ultra-Rapid Annealing (URA) has been demonstrated as a viable means of producing nanocrystalline soft magnetic materials with a saturation magnetic polarization comparable to that of Fe-Si steels (1.85 to 2.02 T) while also maintaining low coercivity (2.5 to 9.3 A/m)[1–3]. However, the high heating rates (&amp;gt; 10&lt;sup&gt;4 &lt;/sup&gt;K/s) and short annealing times (&amp;lt; 3 s) utilized by URA compared to conventional annealing techniques, along with the effect of latent heating during primary crystallization [4], has created new material production challenges. Specifically, the requirement for batch processing by URA places a limit on the commercial viability of this technique. In this work, a Continuous Ultra-Rapid Annealing (CURA) process has been demonstrated whereby a ribbon undergoes URA in a reel-to-reel continuous process. Annealing time (0.1 to 10 s) and tension (5-40 MPa) utilized by CURA are carefully controlled to allow for the processing of brittle nanocrystalline alloys. The microstructural and magnetic properties of nanocrystalline (Fe&lt;sub&gt;0.8&lt;/sub&gt;Co&lt;sub&gt;0.2&lt;/sub&gt;)&lt;sub&gt;86&lt;/sub&gt;B&lt;sub&gt;14&lt;/sub&gt; produced by CURA have been characterized. Figure 1 shows DC hysteresis loops acquired from nanocrystalline (Fe&lt;sub&gt;0.8&lt;/sub&gt;Co&lt;sub&gt;0.2&lt;/sub&gt;)&lt;sub&gt;86&lt;/sub&gt;B&lt;sub&gt;14&lt;/sub&gt; produced by the batch URA [1,2] and the newly developed CURA processes. The coercivity was reduced from 14.9 A/m to 8.8 A/m and the core loss at 1.5 T and 50 Hz was reduced from 0.62 W/kg to 0.50 W/kg by applying the CURA process. The CURA process has also been utilized to produce a nanocrystalline (Fe&lt;sub&gt;0.8&lt;/sub&gt;Co&lt;sub&gt;0.2&lt;/sub&gt;)&lt;sub&gt;86&lt;/sub&gt;B&lt;sub&gt;14&lt;/sub&gt; toroidal core weighing 0.16 kg. This core was machined to produce a stator core for a commercially available 220 W electric motor which demonstrated a 10-25% relative improvement in efficiency over an unmodified motor with a conventional Fe-Si steel stator core [5].

![](https://assets.underline.io/uploads/markdown_image/1/image/c02f56623f189e8fb02e1aa0efeed0ac.jpg)

DC hysteresis loops acquired from nanocrystalline (Fe0.8Co0.2)86B14 produced by conventional Ultra-Rapid Annealing (URA) and the newly developed Continuous Ultra-Rapid Annealing (CURA) process.

![](https://assets.underline.io/uploads/markdown_image/1/image/72718e73d3acbc83299d81db6d6ad39f.jpg)

A photo of the nanocrystalline (Fe0.8Co0.2)86B14 electric motor stator core produced by CURA after winding of the excitation coils and mounting to a commercially available 220 W motor frame.

2022 Joint MMM-INTERMAG

Nanocrystalline soft magnetic materials produced by Continuous Ultra-Rapid Annealing (CURA)

The 15th Joint MMM-INTERMAG Conference (2022 Joint) is sponsored jointly by AIP Publishing and the IEEE Magnetics Society. Members of the international scientific and engineering communities interested in recent developments in fundamental and applied magnetism are invited to attend and contribute to the technical sessions. The technical program will include invited and contributed papers in oral and poster sessions, invited symposia, a plenary session, and an evening session, with about 1500 presentations overall. This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

The 2022 Joint Conference will offer both in-person and prerecorded on-demand content.

For tickets to the event, please register at the following link: https://magnetism.org/register

Please register for the Joint MMM-Intermag conference to join the event.

This Conference provides an outstanding opportunity for worldwide participants to meet their colleagues and collaborators and discuss developments in all areas of magnetism research.

Ultra-Rapid Annealing (URA) has been demonstrated as a viable means of producing nanocrystalline soft magnetic materials with a saturation magnetic polarization comparable to that of Fe-Si steels (1.85 to 2.02 T) while also maintaining low coercivity (2.5 to 9.3 A/m)[1–3]. However, the high heating rates (&gt; 104 K/s) and short annealing times (&lt; 3 s) utilized by URA compared to conventional annealing techniques, along with the effect of latent heating during primary crystallization [4], has created new material production challenges. Specifically, the requirement for batch processing by URA places a limit on the commercial viability of this technique. In this work, a Continuous Ultra-Rapid Annealing (CURA) process has been demonstrated whereby a ribbon undergoes URA in a reel-to-reel continuous process. Annealing time (0.1 to 10 s) and tension (5-40 MPa) utilized by CURA are carefully controlled to allow for the processing of brittle nanocrystalline alloys. The microstructural and magnetic properties of nanocrystalline (Fe0.8Co0.2)86B14 produced by CURA have been characterized. Figure 1 shows DC hysteresis loops acquired from nanocrystalline (Fe0.8Co0.2)86B14 produced by the batch URA [1,2] and the newly developed CURA processes. The coercivity was reduced from 14.9 A/m to 8.8 A/m and the core loss at 1.5 T and 50 Hz was reduced from 0.62 W/kg to 0.50 W/kg by applying the CURA process. The CURA process has also been utilized to produce a nanocrystalline (Fe0.8Co0.2)86B14 toroidal core weighing 0.16 kg. This core was machined to produce a stator core for a commercially available 220 W electric motor which demonstrated a 10-25% relative improvement in efficiency over an unmodified motor with a conventional Fe-Si steel stator core [5].

![](https://assets.underline.io/uploads/markdown_image/1/image/c02f56623f189e8fb02e1aa0efeed0ac.jpg)

DC hysteresis loops acquired from nanocrystalline (Fe0.8Co0.2)86B14 produced by conventional Ultra-Rapid Annealing (URA) and the newly developed Continuous Ultra-Rapid Annealing (CURA) process.

![](https://assets.underline.io/uploads/markdown_image/1/image/72718e73d3acbc83299d81db6d6ad39f.jpg)

A photo of the nanocrystalline (Fe0.8Co0.2)86B14 electric motor stator core produced by CURA after winding of the excitation coils and mounting to a commercially available 220 W motor frame.

technical paper

Magnetic materials in which it is possible to control the topology of their magnetic order in real space or the topology of their magnetic excitations in reciprocal space are highly sought-after as platforms for alternative data storage and computing architectures. Here we show that multiferroic insulators, owing to their magneto-electric coupling, offer a natural and advantageous way to address these two different topologies using laser fields. We demonstrate that via a delicate balance between the energy injection from a high-frequency laser and dissipation, single skyrmions—archetypical topological magnetic textures—can be set into motion with a velocity and propagation direction that can be tuned by the laser field amplitude and polarization, respectively. Moreover, we uncover an ultrafast Floquet magnonic topological phase transition in a laser-driven skyrmion crystal and we propose a new diagnostic tool to reveal it using the magnonic thermal Hall conductivity.

![](https://assets.underline.io/uploads/markdown_image/1/image/7db0278173bbc5cba45a88101bb6611a.jpg)

Real- and reciprocal-space topology can be controlled by lasers. (a) The topological spin structure of a skyrmion carrying in-plane electric polarization Ρ undergoes translational motion under a circularly polarized laser. (b) An ultrafast topological phase transition occurs in the Floquet magnon band structure of skyrmion crystals due to the effective magnetic field induced by circularly polarized laser irradiation.



Laser-Controlled Real and Reciprocal Space Topology in Multiferroic Insulators

Ferrites and magnetic nanoparticles (NPs) are widely used in sectors such as energy, electronics and biomedicine [1,2]. This work shows an optimum combination of co-precipitation, milling and reduction process of ferrite precursors (CoFe2O4 and NiFe2O4) to obtain CoFe and NiFe NPs, respectively, with tailored magnetic properties and improved heat generation for magneto-thermal applications. Ferrite precursor powders have been synthesized by co-precipitation [3] followed by nanostructuring through self-developed ultrafast milling (24 min). Reduction at different temperatures under Ar+H2 has led to NPs with a tuneable composition going from pure ferrite to CoFe and NiFe NPs, with core-shell nanostructures (CoFe2O4-CoFe and NiFe2O4-NiFe) at intermediate reduction stages. An optimized temperature has resulted in CoFe and NiFe NPs with a high saturation magnetization of 235 and 149 emu/g, respectively. Milling has allowed for diminishing the reduction temperature in 100 °C compared to that required for non-milled particles, which is of relevance in view of upscaling (Fig. 1) [4]. The magneto-thermal response of the NPs has been studied by exposure to alternating magnetic fields at 103 kHz for 5 min. Remarkably, an increase of 28% in the heat generated (under an applied field of 20 mT) has been obtained for the reduced milled CoFe NPs in comparison to the non-milled NPs (Fig. 2), due to particle refinement and high saturation magnetization. The milled NiFe NPs has shown a lower heat generation due to agglomeration effects. This cost-efficient and scalable approach eases the synthesis of NiFe and CoFe NPs for magneto-thermal applications. Acknowledgments. Authors acknowledge financial support from EU M-ERA.NET through COSMAG project (PCI2020-112143); from MICINN through NEXUS project (PID2020-115215RB-C21); and from CM through NanoMagCOST project (P2018/NMT-4321). A.J.C.-H. acknowledges support from "La Caixa" by the Doctoral INPhINIT Incoming program (LCF/BQ/DI20/1178002).

![](https://assets.underline.io/uploads/markdown_image/1/image/3d3878bca20e35efefe648bf0daa5801.jpg)

Fig.1. (a) Room temperature hysteresis loops and (b) XRD patterns of milled cobalt ferrite NPs reduced at different temperatures.

![](https://assets.underline.io/uploads/markdown_image/1/image/1e335e0631e7215287a7642ecf21df92.jpg)

Fig.2. Magneto-thermal measurements of milled and non-milled CoFe NPs.

Scalable Synthesis of CoFe and NiFe Nanoparticles from Ferrite Precursors with Tailored Magneto-Thermal Properties by a Combined Co-precipitation, Milling and Reduction Process

Metal Amorphous Nanocomposites (MANCs) are an evolving class of soft magnetic materials consisting of an Fe- or Co-based crystalline phase embedded in an amorphous matrix. In thin-film form, they possess highly tunable magnetic properties, low eddy current and hysteresis losses, and are capable of performing under high-frequency magnetic field reversal. Therefore they are good candidates for a range of applications including use in power electronics, transformers, and electric motors[1, 2]. We investigated the structural, static and dynamic properties of magnetron sputtered and vacuum annealed (5 minutes and 20 minutes at 520oC) films of CoFeMnNbSiB using Transmission Electron Microscopy (TEM), Atom Probe Tomography (APT), Vibrating Sample Magnetometry (VSM) and Ferro-Magnetic Resonance (FMR). The sputtered films did not show crystallinity, however, an Mn-rich columnar structure that spanned the thickness of the film parallel to the growth direction was observed. After annealing for 5 minutes and 20 minutes, the columnar structure transformed to a partially crystallized microstructure with Co and Fe enriched crystallized phases with ~7nm grain size enclosed by an amorphous intergranular region as shown in Fig. 1. The magnetization dynamics of the films were measured using a custom-built instrument with a frequency range of 1-65 GHz and fields up to 1.6 T. The FMR spectrum of annealed samples shows two overlapping resonances (Fig. 2) due to the two phases present in the samples whereas the as-sputtered sample shows only one resonance. The effective magnetization remained constant whereas the linewidth increased from 13 to 55 Oe after annealing. The magnetic coercivity was observed to be (~26 Oe) independent of annealing while the saturation magnetization increased from 828 to 953 emu/cm3. The observed changes in magnetic properties with annealing indicate that short-time annealing can be useful in optimizing the performance of these MANCs and tailoring properties for various applications.

![](https://assets.underline.io/uploads/markdown_image/1/image/8e0cc2fd197e33d1445aaa05db782123.jpg)

Fig. 1.a) TEM image of 20 minutes annealed sample b) Magnified section of a crystalline region

![](https://assets.underline.io/uploads/markdown_image/1/image/5a0af14f69f8ff951824fdad5f91dd49.jpg)

Fig. 2. FMR spectrum of 20 minutes annealed sample at 40 GHz reflecting two overlapping peaks due to dual-phase in the sample

Structural and magnetic characterization of Co-based soft magnetic amorphous nanocomposite films

Magnetic wires can present outstanding magnetic properties such as giant magnetoimpedance (GMI) or magnetic bistability and related single domain wall (DW) propagation. Magnetically soft glass-coated magnetic microwires prepared by the Taylor-Ulitovsky technique with metallic nucleus covered by flexible, insulating and biocompatible glass are quite demanded for a great number of applications [1]. Recenly, we showed that stress-annealing allows magnetic softening, GMI effect improvement and even grading the magnetic anisotropy in Fe-rich microwires [2]. Although generally thinner wires present certain advantages related to the industrial application, for some applications (like non-contact stress monitoring or magnetic tags) thicker wires are highly requested. Recently, preparation of thicker (above 50 μm in diameter, d) glass-coated Fe-rich microwires is reported [3]. In this paper, we present our recent experimental results on preparation and processing of “thick” Co-rich magnetic microwires (d = 94 μm) with graded magnetic anisotropy. From previous publications related to the effect of stress-annealing on magnetic anisotropy of Fe-rich microwires, is known that the stress-annealing induced anisotropy depends on the annealing temperature, Tann [2]. Such graded magnetic anisotropy has been obtained by stress-annealing of Co-rich microwire at variable annealing temperature. The hysteresis loops for different sections of the microwire have been evaluated using a short (2 mm long) movable pick-up coil. A gradual change in the hysteresis loop (measured by the short pick-up coil) of the sample stress-annealed at variable Tann is observed (see Fig.1). Such microwire, presents also variable squareness ratio, Mr/M0, along the microwire length, L (see Fig.1). Obtained graded anisotropy has been attributed to a gradual modification of the domain structure along the microwire. Previously, for preparation of thin films with a graded magnetic anisotropy, rather sophisticated methods were used, including a change in the chemical composition during the deposition of thin films [4]. Accordingly, we propose a rather simple route to design graded magnetic anisotropy in a magnetic microwire.

![](https://assets.underline.io/uploads/markdown_image/1/image/57c8ead2c65eb757399987363b53f20c.jpg)

Graded magnetic anisotropy in Co-rich microwires

Fe-Nb-Cr-B rapidly quenched melt-spun ribbons (MSRs) show glassy structures in the as-quenched state and Curie temperatures (TC) of 290-330 K depending on the Cr content [1]. The medical applications are usually requiring submicron powders, which can be easily targeted to the sick body organs by means of the external magnetic field [2]. The present work focusses on the preparation of Fe67.2Nb0.3Cr12.5B20 submicron powders by high-energy ball milling from MSRs precursors, using different milling agents: oleic acid (OA), sodium oleate (NAOL) and stearic acid (SA). The main challenge is to preserve the glassy structure from MSRs through the milling process, because only the glassy structure guarantees the low TC. MSRs were annealed at 4000C for 1 h to facilitate the milling. The ratio stainless steel balls:powder was of 50:1. The powders milled in OA and NAOL in the ratio of 1:1 have been washed in n-heptane and dried at 700C in vacuum, while for the ones milled in SA, in the ratio of 5:1, trichloroethylene was used for removing the surfactant. After 150 h of milling in OA the powders have ~100 nm, XRD and UHR-TEM investigations indicating the presence of only the glassy structure and the absence of precipitating crystalline phases. The milling up to 250 h reduces the size of the powders to &lt; 50 nm, while the glassy structure is preserved, as confirmed also by the same TC value (~450C) as for the precursor MSRs. The milling in NAOL keeps the powders in the range of 800÷900 nm, while TC remains ~450C. The milling over 100 h in NAOL results in an increase of TC to 650C and of Ms to 45 Am2/kg, compared with MSRs powders milled in OA (Ms = 35 Am2/kg). The increase of TC and Ms is even more obvious for the powders milled in SA (1100C and 112 Am2/kg, respectively). Moreover, the powders milled in SA are not changing their size even after 50 h of milling, i.e. ~5 µm, comparable with the ones of the precursor MSRs. However, the HR-SEM images indicate round shaped powders after milling in SA, compared with the starting lamellar pieces of MSRs, while the XRD and SAED patterns emphasize similar glassy structures for powders and MSRs. Financial support by the NUCLEU Program (PN 19 28 01 01) is gratefully acknowledged.

Influence of wet and dry milling conditions on the evolution of microstructure and TC of Fe-Cr-Nb-B glassy powders

The possibility of the powderization of the precursor with a single amorphous phase was investigated in the FeBNbP and the FeBNbPSi nanocrystalline alloy powders. The Fe90-XBxNb7P3 (x=9, 10), the Fe79.5B9.5Nb7P3Si1 and the Fe82-xB9Nb6P3Six (x=2, 3) powders were prepared by the gas atomization method using high pressure water for rapid quenching. The crystallization by abnormal grain growth was shown by cross sectional images and SAED pattern in the as-atomized Fe81B9Nb7P3 particle. On the other hand, the as-atomized particle as a precursor exhibiting low Hc of 141 A/m with single amorphous phase was observed from a cross sectional image and SAED pattern in the Fe80B10Nb7P3 nanocrystalline alloy powder. In addition, the stability of amorphous phase in the FeBNbP nanocrystalline alloy powder was also significantly improved by the addition of Si. The as-atomized Fe79.5B9.5Nb7P3Si1 nanocrystalline alloy powder with Si of 1 at% was decreased the crystallization peak compared with the Fe80B10Nb7P3 nanocrystalline alloy powder without Si. In particular, the as-atomized Fe79B9Nb6P3Si3 alloy powder with Si of 3% as a precursor powder of nanocrystalline alloy exhibited the excellent magnetic softness of low Hc of 53 A/m compared to ordinary Fe73Si11B11Cr3C2 amorphous and Fe73.5Si13.5B9Nb3Cu1 nanocrystalline alloy powders. Furthermore, the nanocrystallized Fe79B9Nb6P3Si3 powder at 873K achieved both high Bs of 1.41T and low Hc of 37A/m compared to ordinary amorphous, and nanocrystalline alloys. Therefore, we concluded that the novel FeBNbPSi nanocrystalline alloy powder with both high Bs and low Hc was developed for magnetic core of inductor products.

![](https://assets.underline.io/uploads/markdown_image/1/image/550cdf016aa2f60c6e842e8e68bc0cee.jpg)

Fig.1 (a) SEM image of the particle cross section with the Fe81Nb7B9P3, (b) TEM bright field image of amorphous and crystallization region with the Fe81B9Nb7P3, (c), (d), (e) SAED pattern of a region with A, B and C, (f) SEM image of the particle cross section with the Fe80B10Nb7P3, (g) TEM bright field image of amorphous region with the Fe80B10Nb7P3, (h) SAED pattern of D region.

![](https://assets.underline.io/uploads/markdown_image/1/image/a6df95996d718f997f1d5f7c18ef6299.jpg)

Table. 1 Average particle size and magnetic characteristics of Fe90-XBxNb7P3 (x=9, 10), Fe79.5 B9.5Nb7P3Si1 and Fe82-xB9Nb6P3Six (x=2, 3) powders with ordinary FeSiBCCr and FeSiBNbCu powders.

Development of Novel Fe Based Nanocrystalline FeBNbPSi Alloy Powder with High Bs of 1.41T

Amorphous ferromagnetic glass-coated microwires present various properties suitable for technological applications, such as great magnetic softness, ultra-fast magnetization switching and domain wall propagation, inductive heating capabilities or Giant Magnetoimpedance, GMI, effect [1, 2]. Thus, they have been widely studied in the past few years [1]. As-prepared Fe and Co based microwires differ in some of these properties. Fe microwires are observed to present magnetic bistability and rather low GMI values, while Co ones possess nearly non-hysteretic magnetization curves and higher GMI [1], making the latter a more attractive candidate for GMI related technologies. However, Co is a critical raw material, making Fe-based microwires preferable for large scale applications. Thus, search of appropriate postprocessing for magnetic softness and GMI improvement is essentially relevant. Among the prospective methods allowing these goals are stress-annealing and Joule heating. As the latter is more effective for tuning of GMI in Co-rich microwires [1], systematic studies of Joule heating on magnetic properties and GMI of Fe-rich ones are scarce. Accordingly, influence of Joule heating on magnetic properties and GMI effect of Fe75B9Si12C4 glass-coated microwires was studied. The GMI ratio, ΔZ/Z, is defined as: ΔZ/Z = [Z(H) - Z(Hmax)] / Z(Hmax) A decrease in coercivity of Joule heated samples is observed, while hysteresis loop maintain rectangular shape (Fig 1). However, a remarkable increase in ΔZ/Z is observed (Fig 2). Observed GMI ratio improvement has been discussed considering magnetic anisotropy by induced magnetic field during Joule heating and internal stress relaxation. Remarkable GMI effect improvement observed in Joule heated Fe-rich microwires, along the fact that Fe is a more common, cheap metal than Co, makes them suitable for magnetic sensor applications.

![](https://assets.underline.io/uploads/markdown_image/1/image/0c6d500e18157a87372c9dde525ab3a3.jpg)

Fig. 1. Hysteresis loops of Fe75B9Si12C4 microwires Joule heated at 20mA for different times. Inset: coercivity dependence on annealing time.

![](https://assets.underline.io/uploads/markdown_image/1/image/4f8abb050b87d288134fc3e6171b6a1e.jpg)

Fig. 2. GMI ratio of as-prepared (a) and Joule heated for 3min (b) Fe75B9Si12C4 microwires measured at different AC frequencies.

Effect of Joule Heating on GMI and Magnetic Properties of Fe-rich Glass-Coated Microwires

In the present work, we combine magnetometry and magnetic small-angle neutron scattering to study the influence of the microstructure on the macroscopic magnetic properties of a nanocrystalline Ni bulk sample, which was prepared by straining via high-pressure torsion. As seen by magnetometry, the mechanical deformation leads to a significant increase of the coercivity compared to nondeformed polycrystalline Ni. The neutron data reveal a significant spin-misalignment scattering caused by the high density of crystal defects inside the sample, which were created by the severe plastic deformation during the sample preparation. The corresponding magnetic correlation length, which characterizes the spatial magnetization fluctuations in real space, indicates an average defect size of 11 nm, which is smaller than the average crystallite size of 60 nm. In the remanent state, the strain fields around the defects cause spin disorder in the surrounding ferromagnetic bulk, with a penetration depth of around 22 nm. The range and amplitude of the disorder is systematically suppressed by an increasing external magnetic field. Under certain assumptions, the analysis of the penetration depth allows one to determine the magnitude of the effective magnetic anisotropy. For HPT Ni, we find an increased anisotropy (factor of 4), presumably due to magnetoelastic interactions, relative to the single-crystalline ground state. Our findings are supported and illustrated by micromagnetic simulations, which, for the particular case of nonmagnetic defects (holes) embedded in a ferromagnetic Ni phase, further highlight the role of localized spin perturbations for the magnetic microstructure of defect-rich magnets such as high-pressure torsion materials. This work was supported by the financial support from the National Research Fund of Luxembourg (Pride MASSENA Grant No. 10935404 and CORE SANS4NCC Grant), from KAKENHI (Grant No. 19K05102) and from the Japan Science and Technology Agency (Grant No. JPMJSK1511).

Revealing defect-induced spin disorder in nanocrystalline

Magnetic wires are one of the most convenient materials allowing to study domain wall, DW, propagation. From the viewpoint of technological applications, fast, reliable, and controllable DW propagation is essential [1]. Therefore, great efforts have been made to control the single DW propagation [1]. Amorphous perfectly cylindrical microwires with positive magnetostriction coefficient can present a fast (DW velocity, v, of the order of 1 km/s) single DW propagation [2]. In viscous regime below the Walker breakdown field a uniform v is usually assumed if magnetic fielf, H is constant. We observed that in Fe75B9Si12C4 magnetic microwire stress-annealing at variable annealing temperature, T, rather different hysteresis loops for different sections of such microwire are observed (Fig. 1a). In as-prepared microwires DW propagation with the same velocity is observed in different section of the microwire (see Fig. 1b). However, in a media with graded magnetic anisotropy v is essentially non-uniform (Fig. 1c): faster DW propagation is observed in the region with moderate stress-annealing induced magnetic anisotropy (see Fig. 1c). Such character of induced anisotropy is evidenced by the dependence of the inner axially magnetized core radius, Rc. on sample length, L (see Fig. 1d). Evaluated Rc(L) dependence and its correlation with T(L) reflects graded magnetic anisotropy obtained by stress-annealing at variable Tann. Higher DW velocity in the region with induced magnetic anisotropy is explained by the transverse character of stress-annealing induced magnetic anisotropy which affects the travelling domain wall in a similar way as application of transversal bias magnetic field. Obtained graded magnetic anisotropy allows engineering the DW dynamics of Fe-rich microwires and observation of essentially non-uniform singe DW propagation in media with graded magnetic anisotropy.

![](https://assets.underline.io/uploads/markdown_image/1/image/6cc90572f9480697e48013153a1184c0.jpg)

Graded magnetic anisotropy appearing as a modification of hysteresis loop character over the microwire length, L, obtained by stress-annealing at variable T (a), v(H) dependencies in as-prepared microwire (b) and in the region with graded magnetic anisotropy (c) and Rc (L) dependence in microwire with graded anisotropy.

Domain wall propagation in Fe-rich magnetic microwires with graded magnetic anisotropy

The D03 Fe3Sn phase shows higher magnetization and smaller magnetocrystalline anisotropy compared to Fe3Si based on the comprehensive first principles calculations [1]. A new computation-based alloy design method, motivated by the work of Villars [2], was used to design a new alloy system (Fe1-x-yCoxSny)87Nb3B9Cu1 (4&lt;x&lt;27, 5&lt;y&lt;15) to achieve D03 Fe3Sn phase with the help of the melt-spinning process. Differential scanning calorimetry was used to determine the primary crystallization temperatures of the Fe79-xCoxSn8Nb3B9Cu1 alloys (x=4, 9, 14, 19 and 24), which have peak temperatures from 405°C to 420°C at a heating rate of 10°C /min. The amorphous ribbons were encapsulated in fused quartz ampoules and annealed in tube furnace at 450°C, 500°C, or 550 °C for 3600 seconds. X-Ray Diffraction (XRD) has been used to analyze structural properties of as-spun and heat-treated ribbons of all alloy compositions. Partial crystalline exists during the melt-spinning process for these series alloys except the Fe60Co20Sn7Nb3B9Cu1 as-spun ribbons, which has a single broad scattering peak of XRD diffractograms indicating an amorphous phase. XRD diffractogram of the heat-treated ribbons are comprised of a B2 phase, which has a primitive cubic structure. The crystallite sizes for each heat-treated sample were estimated by Scherrer broadening to have values between 6 and 11 nm. The magnetic properties of as-spun and heat-treated ribbons were studied by vibrating sample magnetometry. Saturation magnetization and coercivity were determined from room temperature magnetic hysteresis loops. The highest magnetization value 171.4 Am2/kg was achieved by Fe60Co22Sn5Nb3B9Cu1 alloy annealed at 500°C while the coercivity value is 67.3A/m.

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