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Magnetocrystalline anisotropy of the easy-plane metallic antiferromagnet Fe_2As

机译：Easy-Plane Metallic Antiferromagnet Fe_2as的磁镀晶各向异性

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Magnetocrystalline anisotropy is a fundamental property of magnetic materials that determines the dynamics of magnetic precession, the frequency of spin waves, the thermal stability of magnetic domains, and the efficiency of spintronic devices. We combine torque magnetometry and density functional theory calculations to determine the magnetocrystalline anisotropy of the metallic antiferromagnet Fe_2As. Fe_2As has a tetragonal crystal structure with the Neel vector lying in the (001) plane. We report that the fourfold magnetocrystalline anisotropy in the (001) plane of Fe_2As is extremely small, K_(22) = - 150J/m~3 at T =4K, much smaller than the perpendicular magnetic anisotropy of ferromagnetic structure widely used in spintronic devices. K_(22) is strongly temperature dependent and close to zero at T > 150K. The anisotropy K in the (010) plane is too large to be measured by torque magnetometry and we determine K1 =-830kJ/m~3 using first-principles density functional theory. Our simulations show that the contribution to the anisotropy from classical magnetic dipole-dipole interactions is comparable to the contribution from spin-orbit coupling. The calculated fourfold anisotropy in the (001) plane AV. ranges from -290 to 280 J/m the same order of magnitude as the measured value. We used K_1 from theory to predict the frequency and polarization of the lowest frequency antiferromagnetic resonance mode and find that the mode is linearly polarized in the (001) plane with f = 670 GHz.
机译：磁镀各向异性是磁性材料的基本性质，决定了磁进的动态，旋转波的频率，磁性畴的热稳定性以及旋转式装置的效率。我们将扭矩磁体和密度泛函理论计算结合以确定金属反霉菌Fe_2as的磁镀晶各向异性。 FE_2AS具有四边形晶体结构，具有位于（001）平面中的NEEL矢量。我们认为Fe_2as的（001）平面中的四倍磁镀各向异性是T = 4k的k_（22）= -150J / m〜3，远小于在旋转调整器件中广泛使用的铁磁结构的垂直磁各向异性。 K_（22）在T> 150K处依赖于温度强度，靠近零。 （010）平面中的各向异性k 太大而无法通过扭矩磁体测量，并且我们使用第一原理密度函数理论来确定K1 = -830kJ / m〜3。我们的模拟表明，从经典磁偶极子 - 偶极相互作用对各向异性的贡献与来自旋转轨道耦合的贡献相当。 （001）平面AV中计算的四倍各向异性。范围从-290到280 j / m 与测量值相同的数量级。我们从理论上使用K_1来预测最低频率反铁磁谐振模式的频率和偏振，并发现该模式在具有F = 670GHz的（001）平面中线性偏振。

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  • 来源
    《Physical review》 |2020年第6期|064415.1-064415.10|共10页
  • 作者

    Kexin Yang; Kisung Kang; Zhu Diao; Manohar H. Karigerasi; Daniel P. Shoemaker; Andre Schleife; David G. Cahill;

  • 作者单位

    Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

    Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

    Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Department of Physics AlbaNova University Center Stockholm University SE-106 91 Stockholm Sweden Department of Physics Florida A&M University Tallahassee Florida 32307 USA;

    Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

    Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

    Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA National Center for Supercomputing Applications University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

    Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Materials Science and Engineering University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA;

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