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arXiv 2201.03316cond-mat.str-el
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双矢量序参量材料的各向异性磁电阻理论

A theory for anisotropic magnetoresistance in materials with two vector order parameters

X. R. Wang

摘要:

各向异性磁电阻(AMR)和相关的平面霍尔电阻(PHR)是磁性材料中普遍存在的现象。虽然具有一个序参量的磁性多晶材料中AMR和PHR的普适角度依赖性是众所周知的,但迄今为止还没有已知的用于其他类别磁性材料的类似普适关系。在这里,我提出了一个通用的理论,在磁性材料的两个矢量序参量,如磁性单晶与一个占主导地位的晶轴或多晶非共线亚铁磁材料的电流磁效应。结果表明,AMR和PHR具有普遍的角度依赖性。一般来说,纵向和横向电阻率在没有反转对称性的情况下都是非互易的:当电流反向时,电阻率取不同的值。与简单磁性多晶材料AMR和PHR大小相同,$π/4$相位不同,具有两个矢量序参量的材料AMR和PHR大小一般不相同,相位差也不是$π/4$。具有两个序参量的材料的周期性是$2π$,而不是通常AMR和PHR的$π$周期性。

英文摘要:

Anisotropic magnetoresistance (AMR) and related planar Hall resistance (PHR) are ubiquitous phenomena of magnetic materials. Although the universal angular dependences of AMR and PHR in magnetic polycrystalline materials with one order parameter are well known, no similar universal relation for other class of magnetic materials are known to date. Here I present a general theory of galvanomagnetic effects in magnetic materials with two vector order parameters, such as magnetic single crystals with a dominated crystalline axis or polycrystalline non-collinear ferrimagnetic materials. It is shown that AMR and PHR have a universal angular dependence. In general, both longitudinal and transverse resistivity are non-reciprocal in the absence of inversion symmetry: Resistivity takes different value when the current is reversed. Different from simple magnetic polycrystalline materials where AMR and PHR have the same magnitude, and $π/4$ out of phase, the magnitude of AMR and PHR of materials with two vector order parameters are not the same in general, and the phase difference is not $π/4$. Instead of $π$ periodicity of the usual AMR and PHR, the periodicities of materials with two order parameters are $2π$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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