United States

Magnetic two-dimensional (2D) van der Waals (vdW) materials show promising magnetic properties, which can be utilized to build spintronic devices with improved performance and new functionalities. However, most vdW magnets have Curie temperatures below 300 K. With molecular beam epitaxy (MBE) [1], we recently synthesized 1T-phase single-crystal CrTe&lt;sub&gt;2&lt;/sub&gt; thin films [2], which show ferromagnetism and strong perpendicular magnetic anisotropy at room temperature. We have also studied the magnetic domain evolutions and the anomalous Hall effect (AHE) in these samples at different temperatures and magnetic fields. As shown in Fig. 1, MFM has revealed clear magnetic stripe domains with out-of-plane polarization in the 16 ML CrTe&lt;sub&gt;2&lt;/sub&gt; film at room temperature. The magnetic stripe domains still exist upon applying an out-of-plane magnetic field, but the width becomes narrower at +1.2 kOe and wider at -1.2 kOe, respectively. We have patterned the samples into Hall bars and measured electron transport properties at different temperatures. Both the 8 ML and 16 ML CrTe&lt;sub&gt;2&lt;/sub&gt; films show AHE up to room temperature. However, the AHE changes sign between 100 K and 150 K. This indicates intriguing magnetic domain evolution at lower temperatures. Further work has been carried out toward a deeper understanding of the magnetization in CrTe&lt;sub&gt;2&lt;/sub&gt;. Our study has highlighted CrTe&lt;sub&gt;2&lt;/sub&gt; as a unique platform for studying vdW magnetism and opened a new avenue for developing large-scale 2D magnet-based spintronics devices.

![](https://assets.underline.io/uploads/markdown_image/1/image/56f0f120d0aa30f2da3b95b65bbc1a07.jpg)

Fig.1: MFM images showing stripe domains for the 16 ML CrTe2 at H = 0 (a), +1.2 kOe (b) and -1.2 kOe (c), respectively.

![](https://assets.underline.io/uploads/markdown_image/1/image/8ef809c914f5e6a06754ccaa6457d940.jpg)

Fig.2: a. Anomalous Hall resistance vs. H at different temperatures for 8 ML CrTe2. b, c. Dependence of anomalous hall resistance (RAHE) (b) and coercivity (c) vs. temperature for 8 ML and 16 ML CrTe2.



2022 Joint MMM-INTERMAG

Magnetization evolution in room-temperature van der Waals magnet CrTe2

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.

Magnetic two-dimensional (2D) van der Waals (vdW) materials show promising magnetic properties, which can be utilized to build spintronic devices with improved performance and new functionalities. However, most vdW magnets have Curie temperatures below 300 K. With molecular beam epitaxy (MBE) [1], we recently synthesized 1T-phase single-crystal CrTe2 thin films [2], which show ferromagnetism and strong perpendicular magnetic anisotropy at room temperature. We have also studied the magnetic domain evolutions and the anomalous Hall effect (AHE) in these samples at different temperatures and magnetic fields. As shown in Fig. 1, MFM has revealed clear magnetic stripe domains with out-of-plane polarization in the 16 ML CrTe2 film at room temperature. The magnetic stripe domains still exist upon applying an out-of-plane magnetic field, but the width becomes narrower at +1.2 kOe and wider at -1.2 kOe, respectively. We have patterned the samples into Hall bars and measured electron transport properties at different temperatures. Both the 8 ML and 16 ML CrTe2 films show AHE up to room temperature. However, the AHE changes sign between 100 K and 150 K. This indicates intriguing magnetic domain evolution at lower temperatures. Further work has been carried out toward a deeper understanding of the magnetization in CrTe2. Our study has highlighted CrTe2 as a unique platform for studying vdW magnetism and opened a new avenue for developing large-scale 2D magnet-based spintronics devices.

![](https://assets.underline.io/uploads/markdown_image/1/image/56f0f120d0aa30f2da3b95b65bbc1a07.jpg)

Fig.1: MFM images showing stripe domains for the 16 ML CrTe2 at H = 0 (a), +1.2 kOe (b) and -1.2 kOe (c), respectively.

![](https://assets.underline.io/uploads/markdown_image/1/image/8ef809c914f5e6a06754ccaa6457d940.jpg)

Fig.2: a. Anomalous Hall resistance vs. H at different temperatures for 8 ML CrTe2. b, c. Dependence of anomalous hall resistance (RAHE) (b) and coercivity (c) vs. temperature for 8 ML and 16 ML CrTe2.

technical paper

Recently, 5d and 4d oxides and halides with honeycomb lattice structures are of great interest [1-2] for exhibiting an interplay between an isotropic Heisenberg-type exchange interaction (J) and an anisotropic Kitaev-type exchange interaction (K), see Fig. 1a. We predict that such an interplay can lead to topological edge states with chiral conduction when the anisotropic interaction is at least twice the strength of the isotropic interaction (i.e. K ≥ 2J), see Figs. 1b-c. We show that these interactions give rise to new types of antiferromagnetic orders, which determine the chirality of the edge atomic chain. We show calculations for sodium iridate and alpha-ruthenium chloride, both known to exhibit a zigzag antiferromagnetic order at low temperatures, and discuss the chiral edge conduction in the context of the relative strength between J and K. The edge conduction in the presence of a zigzag antiferromagnetic order will be manifested as a quantized Hall conductance when the number of zigzag atomic chains is odd (see Fig. 1b) since both edges will have the same magnetic orders. On the other hand, the Hall conductance will be zero when the number of zigzag atomic chains is even (see Fig. 1c) since the edges will have opposite magnetic orders. These signatures of the exchange interaction induced chiral edge conductions in odd and even numbers of two-dimensional atomic chains are similar to the well-known signatures of a quantum anomalous Hall insulator and an axion insulator states typically observed in a three-dimensional magnetic topological insulator [3-4], respectively. We further use a widely used model for two-dimensional topological materials to analyze the underlying mechanisms of the predicted phenomena.

![](https://assets.underline.io/uploads/markdown_image/1/image/b67aecaae65e534de04962906894efe1.jpg)

(a) Honeycomb lattice with isotropic (J) and anisotropic (K) exchange interactions. Hall conductance Gxy = Vx / Iy is calculated when the number of zigzag atomic chains is (b) odd and (c) even, as a function of K / J.

Chiral edge conduction induced by large anisotropic exchange interactions.

Materials exhibiting high degree of spin polarization such as half-metals or spin-gapless semiconductors are in demand for spin-transport-based devices. Especially, half metallic Heusler compounds have attracted much attention because they have tunable magnetic properties and exhibit high Curie temperature much above room temperature. We have synthesized one such predicted half metal, FeCrVAl, using arc melting and annealing. The vacuum annealing was done at 600oC for 48 hours. In addition, we also studied the effect of Mn substitution on the structural, magnetic, and electronic band properties of FeCrVAl synthesizing samples with compositions FeCr0.5Mn0.5VAl and FeCrV0.5Mn0.5Al. The room temperature, x-ray diffraction patterns indicate that FeCrVAl and FeCrV0.5Mn0.5Al are cubic in structure with A2 type disorder, whereas FeCr0.5Mn0.5Val is more ordered as evidenced by the presence of superlattice peaks. All samples show small saturation magnetizations at room temperature and the thermomagnetic curves M(T) are similar to that of a paramagnetic material. However, as shown in Fig.1 below, the M(T) of FeCr0.5Mn0.5VAl is different and shows a slow magnetic transitionat 800 K similar to that of a ferrimagnetic material. In this presentation, we will discuss the structural, magnetic and electron band properties of the synthesized materials and the effect of disorder on the properties of FeCrVAl. This research is supported by the National Science Foundation (NSF) under Grant Numbers 2003828 and 2003856 via DMR and EPSCoR.

![](https://assets.underline.io/uploads/markdown_image/1/image/671008ce0e34982996f2b9cfad55899c.jpg)

Figure 1: Thermomagnetic curve M(T) of FeCr0.5Mn0.5VAl alloy. The inset shows the M (H) curve recorded at 300 K.

Experimental and theoretical investigation of FeCrVAl and related compounds

Heusler alloys have been investigated intensively as a potential spin source with 100% spin polarisation at room temperature [1,2]. Theey can be used in magnetoresistive junctions for a next generation read head and a magnetic memory cell [3]. We have recently reduced their crystallisation temperature by growing on the (110) plane [4]. This can be achieved by growing on a body-centred cubic seed layer [5],[6]. In this study, we systematically investigate the effect of seed and capping layers on Co2FeAl0.5Si0.5 (CFAS) Heusler-alloy films. Heusler alloy films were grown on a thermally oxidised Si substrate in the form of Cr (0 and 3)/W (10)/CF(A)S (10)/X (5)/Ru (3) (thickness in nm, X: W, Ta, V, Ag and Pt) using a high target utilisation sputtering system at room temperature. These films were annealed at 300~350°C for 1~3 hours. The structural and magnetic properties were characterised by X-ray diffraction (XRD) and vibrating sample magnetometry. The magnetisation reversal process was also imaged using magnetic force microscope. Figure 1(a) confirms all films show W crystallisation along the (110) surface orientation, promoting the CFAS crystallisation as confirmed by the CFAS(220) peak. As shown in Fig. 1(b), all CFAS films exhibit perpendicular magnetic anisotropy but with clear deviations under the influence of top-interfaces. The magnetisation curve of the W cap exhibits the highest squareness. In-plane magnetisation measurements also confirm the CFAS/W top interface shows single-step reversal. This means that the sample consisting of a W/CFAS/W trilayer shows the ideal magnetic properties for junction applications. As listed in Fig. 1(d), all films show MS within the range of 650~850 emu/cm3, which is almost 30% smaller than the bulk value. This work was partially supported by EPSRC (EP/M02458X/1 and EP/V007211/1) and JST CREST (No. JPMJCR17J5).

![](https://assets.underline.io/uploads/markdown_image/1/image/71da82cf3408d23ffc6e5565bf99a0d6.jpg)

(a) XRD θ-2θ scans and (b) out-of-plane and (c) in-plane magnetisation curves of Si/SiO2//W (10)/CFAS (10)/Y (5)/Ru (3) (thickness in nm, Y: W, Ta, V, Ag and Pt). (d) Saturation magnetisation of these films calculated from (c).

Perpendicular Anisotropy Controlled by Seed and Capping Layers of Heusler Alloy Films

Co-based Heusler alloys are currently exploited in several interesting spintronics applications, such as magnetic electrodes in spin-valve and magnetic tunnel junction devices, due to their half-metallic ferromagnetic properties [1]. Their magnetic and electronic transport behavior at room temperature are intensely studied and tuned to meet several applications demands. In particular, the electronic transport properties display an unusual trend of Seebeck coefficient and electrical conductivity proving the half-metallic ferromagnetic behavior of these compounds [2]. In this work, Co2HfSn and Co2ZrSn bulk alloys are synthetized by arc-furnace in which the melt contains pure elements in the appropriate stoichiometric quantities; subsequent, annealing at 800 °C for 6 days is performed to release stress and reach the equilibrium phase. Magnetic properties were investigated in the wide temperature range from 2 to 500 K by SQUID and VSM magnetometers; isothermal hysteresis loops M(H) and magnetization as a function of temperature curves M(T) have been measured. Magnetic results are in excellent agreement with the mean-field model of itinerant ferromagnetism (Stoner model) in the limit of very weak ferromagnetism. The linear relationship between M2 and H/M (i.e. Arrott plot) is maintained at all studied temperatures, both well below and above the Curie temperature (see Fig. 1a). The weak itinerant ferromagnetism model, by means of its temperature-dependent coefficients, is successfully used to determine the Curie temperature resulting at 432 K and 458 K for the Co2HfSn and Co2ZrSn alloy, respectively. In addition, the extrapolation of the experimental M(T) curve at T = 0 K reveals a magnetic moment of 2.0 μB/f.u. 1.81 μB/f.u. for the Co2HfSn and Co2ZrSn samples, respectively. Electric and magnetic experimental results are compared with the ab-initio calculation, which provides the spin-polarized density of states (DOS) confirming that Co2HfSn and Co2ZrSn alloys are half-metallic compounds with a majority-spin channel across the Fermi surface, whereas the minority-spin channel shows a small band gap (see Fig. 1b).

![](https://assets.underline.io/uploads/markdown_image/1/image/df3139ef06e4c7e8a2379ed3a8f014a3.jpg)

a) Arrott plot for the Co2HfSn sample; b) DOS by ab-initio calculation for the Co2ZrSn sample

Weak ferromagnetism and electronic properties of half-metallic Co2HfSn and Co2ZrSn Heusler alloys

Exceptional tunability in the electronic and magnetic properties makes Heusler compounds very promising from both the fundamental and applied perspectives. Half-metallic ferromagnetism, half-metallic fully-compensated ferrimagnetism, spin-gapless semiconducting behavior, and fully-compensated ferrimagnetic spin-gapless semiconducting behavior have been predicted or demonstrated experimentally in Heusler compounds which makes them suitable for applications in a number of novel spintronic devices1,2,3,4,5. Half-metallic Co-based Heusler alloys are among the most attractive systems due to their high Curie temperatures, high spin polarization and the structural similarity to binary semiconductors6,7,8. Spin-gapless semiconductors can be regarded as a combination of gapless semiconductors and half-metallic ferromagnets where the conducting electrons or holes are not only 100% spin polarized but also easily excited. The realization of spin-gapless semiconducting behavior in Heusler alloys is expected to fulfill the needs for semiconductor spintronics. In this work, we have introduced the substitution of low valence transition metal atoms Y = Ti, V, Cr, Mn, and Fe to Co atoms in the parent Co2FeGa system, and examined the properties of quaternary Heusler compounds Co2-xYxFeGa (x = 0.50), both experimentally and theoretically to get a global overview of the electronic, magnetic, electron transport and mechanical properties. All single-phase alloys exhibit Heusler like L21 ordering, as corroborated by X-ray diffraction. The low-temperature saturation magnetic moments agree fairly well with the values expected from a Slater-Pauling rule for half metals (Fig.1). Electrical transport measurements are performed to explain the electronic structure of the alloys. The temperature dependence of electrical resistivity for Mn substituted alloy shows semiconducting nature in the complete temperature regime (5-400)K (Fig.2). Ab initio calculations are also performed to understand the experimental findings.

![](https://assets.underline.io/uploads/markdown_image/1/image/14f7b59db99b038cf74a4718f8f85273.jpg)

The variation of saturation magnetic moment with valence electron counts per formula units with element Y.

![](https://assets.underline.io/uploads/markdown_image/1/image/4d76d8c1a433798c5183033756315811.jpg)

Temperature dependence of electrical resistivity in Co1.50Mn0.50FeGa at zero magnetic field showing semiconducting behavior.

Possible half-metallic and spin-gapless semiconducting behavior in quaternary Heusler compounds Co2-xYxFeGa (Y = Ti, V, Cr, Mn, Fe, and Co, x = 0.50)

Quantized electronic transport in magnetic topological insulators is intertwined with spontaneous magnetic ordering, as magnetization controls band topology through the exchange interaction. We show that considering the exchange gaps at the mean-field level is inadequate to predict phase transitions between electronic states of distinct topology. Thermal spin fluctuations that disturb the magnetization can act as frozen disorders, which strongly scatter electrons and thus reduce the onset temperature of quantized transport appreciably even in the absence of structural impurities. This effect, which has hitherto been overlooked, provides an alternative explanation of recent experiments on magnetic topological insulators.

![](https://assets.underline.io/uploads/markdown_image/1/image/7c46726549c088ed001f510b9339cdce.jpg)

Spin Fluctuations in Quantized Transport of Magnetic Topological Insulators

Inorganic chiral crystals have attracted much recent interest for their potential topological quantum properties1. In particular, β-Ag2Te was shown to be a bulk insulator hosting a topological surface state (TSS) of highly anisotropic Dirac dispersion2. On the other hand, in chiral materials, an electric current along the helical axis produces a collinear spin polarization; this is known as chirality-induced spin selectivity (CISS)3. This raises the intriguing possibility that Ag2Te may be a material that simultaneously exhibits TSS and CISS. Here we report on electrical transport measurements on oriented films of nonmagnetic Ag2+δTe. The films were grown by electron-beam evaporation on quartz, which were shown to be highly textured by XRD. With decreasing temperature, the film resistivity shows semiconducting behavior at high temperatures, and plateaus below ~50 K, consistent with the predominance of a TSS (Fig. 1). The in-plane field magnetoresistance (MR) of the samples exhibits qualitatively different behavior for the longitudinal and transverse configurations. The transverse MR is positive and of a similar magnitude to polycrystalline Ag2Te samples4. In contrast, the longitudinal MR is negative in the semiconducting temperature range, and remains substantial at 300 K. At lower temperatures, the longitudinal MR shows a non-monotonic behavior, with sign reversals for the slope and even magnitude with increasing field (Fig. 2). The unusual MR in the oriented films of Ag2+δTe implies two competing mechanisms behind the magnetotransport properties of Ag2+δTe, possibly reflecting the coexistence of a TSS on the surface and CISS in the bulk. *Work supported by NSF grant DMR-1905843

![](https://assets.underline.io/uploads/markdown_image/1/image/3dbdf24c4831393f5bc0415e2f16b80a.jpg)

![](https://assets.underline.io/uploads/markdown_image/1/image/b148479fb729dd5560b9b113714769b9.jpg)

Sign Reversal and Large Anisotropy in the Magnetoresistance of Oriented Thin Films of Ag2+δTe

Sign Reversal and Large Anisotropy in the Magnetoresistance of Oriented Thin Films of Ag2+δTe

The search for magnetic topological semimetals has been one of the most intriguing issues in the field of spintronics because they exhibit anomalous transport properties that can be utilized for novel spintronic devices. Quite recently, it was theoretically predicted that an inverse spinel compound VMg2O4 is a good magnetic Weyl semimetal [1,2]. The Weyl points are found just above the Fermi energy in the eg-band formed by the 3d-orbitals of the tetravalent V on the diamond lattice. Stimulated by these previous works, here we study the electronic states and transport properties of another spinel compound MnMg2O4, in which V is totally substituted for Mn with a smaller ionic radius. The significant difference between V and Mn is that, if they maintain the nominal tetravalent configuration, V has one electron in the eg-orbital while Mn also has one hole in the eg-orbital in the low-spin state or one electron in the t2g orbital in the high-spin state. Here we focus on how the topological properties found in VMg2O4 can be affected by the orbital symmetry by first-principles calculations using WIEN2k code. The band structure and the density of states of MnMg2O4 are shown in Figure 1 (a) and (b), respectively. We find that the Fermi energy lies at the t2g band and high-spin state is realized in the 3d electrons of Mn. The resulting band structure is half-metallic with the minority band gap is found to be 3eV. We note that, unlike the eg-band lies around 1eV below the Fermi level, there is no obvious linear crossing in the t2g band. We also compute the intrinsic anomalous Hall conductivity (AHC) within the linear-response theory in the clean limit, and the energy dependence of the AHC is shown in Fig. 2. As expected from the band structure in Fig. 1(a), the AHC is very small at the Fermi energy, shown with black line. We also examine the effects of the compressive strain on the electronic structures and AHC of the systems. Lifting the degeneracy of the t2g band, the Weyl points appears slightly above the Fermi energy, resulting in a large AHC ( -144 S/cm ).

![](https://assets.underline.io/uploads/markdown_image/1/image/b9452ae2fe6ff8055dc1e70c5a891907.jpg)

Fig.1
(a) The band structure and (b) the density of states of MnMg2O4.

![](https://assets.underline.io/uploads/markdown_image/1/image/d084731d45c35b3bbf4ae0675c47bd19.jpg)

Fig.2
The energy dependences of the anomalous Hall conductivity with several compressive strains.

Ab initio study on the possible magnetic topological semimetallic state in MnMg2O4.

The rapid discovery of two-dimensional (2D) van der Waals (vdW) quantum materials has led to heterostructures that integrate diverse quantum functionalities such as topological phases, magnetism, and superconductivity. While much of the attention in this context has been centered on the heterogeneous stacking of exfoliated flakes, the epitaxial synthesis of vdW heterostructures with well-controlled interfaces is developing as an attractive route towards wafer-scale platforms for systematically exploring fundamental properties and fashioning proof-of-concept devices. Here, we use molecular beam epitaxy (MBE) to synthesize a vdW heterostructure that interfaces two material systems of contemporary interest: a 2D ferromagnet (1T-CrTe2) and a topological semimetal (ZrTe2).1 We characterize the crystal structure and stoichiometry of our MBE-grown thin films via scanning transmission electron microscopy, x-ray diffraction, and x-ray photoelectron spectroscopy. We also carry out in-vacuo angle-resolved photoemission spectroscopy to determine the band structure of the 1T-CrTe2 films and find good agreement with first-principles band structure calculations. Temperature-dependent anomalous Hall measurements reveal that robust ferromagnetic order persists in the true 2D limit of one unit-cell (u.c.) thick 1T-CrTe2 grown epitaxially on ZrTe2. In thicker samples (12 u.c. thick CrTe2), the anomalous Hall effect exhibits a magnetic field dependence that may arise from real-space Berry curvature. Finally, in ultrathin CrTe2 (3 u.c. thickness), we demonstrate current-driven magnetization switching in a full vdW topological semimetal/2D ferromagnet heterostructure device. This work was supported by NSF Grant Nos. DMR-1539916, DMR-2011401, ECCS-2025124, DOE EFRC grant DE-SC0019331, and SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by NIST.

ZrTe2/CrTe2: an epitaxial van der Waals platform for spintronics

The transition metal dichalcogenides are a class of layered materials with a van der Waals terminated surface that provides novel bonding characteristics for the preparation of nanometer scale metallic films. Furthermore, in single layer form, systems such as MoS2 act as a semiconducting analog to graphene, making it of interest to understand the formation of metal contacts on MoS2 for developing optoelectronic and spintronic device structures. We have investigated the electronic, magnetic, and structural properties of the Ni/MoS2 and Ni/WSe2 interfaces for nanometer scale films using a combination of scanning probe microscopy and density functional calculations. Our experiments show that Ni grows in a very different manner than other FCC metals like Au, Ag, and Pd. Despite a very large lattice mismatch, these three metals form quantized nanostructures with atomically flat surfaces. Nanometer scale Ni films show no signs of such quantized features, instead forming grains as might be expected for metallic growth on an inert system with poor lattice matching. The difference in growth patterns arises from a significantly larger bonding energy at the Ni/dichalcogenide interface. While the enhanced bonding also increases the impact of strain on film growth, it also leads to stronger hybridization between the Ni and dichalcogenide molecules. According to our calculations, this induces spin-polarized metallic behavior in the uppermost molecular layer of the otherwise semiconducting dichalcognide substrate. This confinement to the uppermost molecular layer creates an atomically abrupt magnetic interface within the dichalcogenide substrate. At the same time, the electronic and magnetic properties of Ni are nearly unaffected by the presence of WSe2 and MoS2, except a small reduction of magnetic moment at the interfacial Ni atoms. This research is supported by Grant No. DE-SC0020334 funded by the U.S. Department of Energy, Office of Science.

Magnetization evolution in room-temperature van der Waals magnet CrTe2

Downloads

Next from 2022 Joint MMM-INTERMAG

Chiral edge conduction induced by large anisotropic exchange interactions.

Similar lecture

Oersted-field- and current- induced Bloch Point domain wall dynamics in cylindrical Ni nanowires

Magnetization evolution in room-temperature van der Waals magnet CrTe2

.css-70qvj9{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;}Downloads

Next from 2022 Joint MMM-INTERMAG

Chiral edge conduction induced by large anisotropic exchange interactions.

Similar lecture

Oersted-field- and current- induced Bloch Point domain wall dynamics in cylindrical Ni nanowires

Downloads