Magnetic anisotropy in single-crystalline antiferromagnetic Mn2Au

Gebre, Mebatsion S.; Banner, Rebecca K.; Kang, Kisung; Qu, Kejian; Cao, Huibo; Schleife, André; Shoemaker, Daniel P.

doi:10.1103/physrevmaterials.8.084413

Magnetic anisotropy in single-crystalline antiferromagnetic Mn2 Au

Journal Article · Fri Aug 30 00:00:00 EDT 2024 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.8.084413· OSTI ID:2440985

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Univ. of Illinois at Urbana-Champaign, IL (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States); Georgia Institute of Technology, Atlanta, GA (United States); Skidmore College, Saratoga Springs, NY (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Multiple recent studies have identified the metallic antiferromagnet Mn₂⁢Au to be a candidate for spintronic applications due to apparent in-plane anisotropy, preserved magnetic properties above room temperature, and current-induced Néel vector switching. Crystal growth is complicated by the fact that Mn₂⁢Au melts incongruently. We present a bismuth flux method to grow millimeter-scale bulk single crystals of Mn₂⁢Au in order to examine the intrinsic anisotropic electrical and magnetic properties. Flux quenching experiments reveal that the Mn₂⁢Au crystals precipitate below 550°⁢C, about 100⁢°⁢C below the decomposition temperature of Mn₂⁢Au. Bulk Mn₂⁢Au crystals have a room-temperature resistivity of 16–19 µ⁢Ωcm and a residual resistivity ratio of 41. Mn₂⁢Au crystals have a dimensionless susceptibility on the order of 10^–4 (SI units), comparable to calculated and experimental reports on powder samples. Single-crystal neutron diffraction confirms the in-plane magnetic structure. The tetragonal symmetry of Mn₂⁢Au constrains the ab-plane magnetic susceptibility to be constant, meaning that χ₁₀₀=χ₁₁₀ in the low-field limit, below any spin-flop transition. We find that three measured magnetic susceptibilities χ₁₀₀, χ₁₁₀, and χ₀₀₁ are the same order of magnitude and agree with the calculated prediction, meaning the low-field susceptibility of Mn₂⁢Au is quite isotropic, despite clear differences in ab-plane and ac-plane magnetocrystalline anisotropy. Mn₂⁢Au is calculated to have an extremely high in-plane spin-flop field above 30 T, which is much larger than that of another in-plane antiferromagnet, Fe₂⁢As (less than 1 T). Finally, the subtle anisotropy of intrinsic susceptibilities may lead to dominating effects from shape, crystalline texture, strain, and defects in devices that attempt spin readout in Mn_2⁢Au.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2440985

Alternate ID(s):: OSTI ID: 2473476

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 8 Vol. 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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Magnetic anisotropy in single-crystalline antiferromagnetic Mn2 Au

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