Controlling Chiral Spin States of a Triangular‐Lattice Magnet by Cooling in a Magnetic Field
Controlling Chiral Spin States of a Triangular‐Lattice Magnet by Cooling in a Magnetic Field
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DOI：
10.1002/adfm.201900947
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发表时间：
2019-07
影响因子：
19
通讯作者：
S. Deng;G. Fischer;M. Uhlarz;J. Wosnitza;K. Bohnen;R. Heid;Cong Wang;C. Sürgers
中科院分区：
文献类型：
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作者：
S. Deng;G. Fischer;M. Uhlarz;J. Wosnitza;K. Bohnen;R. Heid;Cong Wang;C. Sürgers
具有非共线和非共面磁矩排列的磁性材料具有非零标量自旋手性，表现出独特的磁性和自旋相关的电子输运性质。自旋手性通常出现在竞争交换作用导致磁矩之间的几何阻碍以及晶格和磁结构之间的强耦合的材料中。这些特征在锰基反钙钛矿中尤其强烈，其中相互作用和手性可以通过晶格的置换修饰来调节。基于密度泛函理论计算和磁场冷却后的磁化强度测量，提出了磁有序Mn3.338Ni0.651N反钙钛矿中形成两个不等手性自旋态的证据。当外加磁场平行或反平行于冷却场方向时，低场时磁场依赖的磁化强度和霍尔效应的垂直位移以及非对称磁阻效应证明了存在符号相反、大小不同的两个标量自旋手性。这为操纵自旋手性在手性自旋电子学新兴领域的潜在应用开辟了可能性。
Magnetic materials with a non‐collinear and non‐coplanar arrangement of magnetic moments hosting a nonzero scalar spin‐chirality exhibit unique magnetic and spin‐dependent electronic transport properties. The spin chirality often occurs in materials where competing exchange interactions lead to geometrical frustrations between magnetic moments and to a strong coupling between the crystal lattice and the magnetic structure. These characteristics are particularly strong in Mn‐based antiperovskites where the interactions and chirality can be tuned by substitutional modifications of the crystalline lattice. This study presents evidence for the formation of two unequal chiral spin states in magnetically ordered Mn3.338Ni0.651N antiperovskite based on density functional theory calculations and supported by magnetization measurements after cooling in a magnetic field. The existence of two scalar spin‐chiralities of opposite sign and different magnitude is demonstrated by a vertical shift of the magnetic‐field dependent magnetization and Hall effect at low fields and from an asymmetrical magnetoresistivity when the applied magnetic field is oriented parallel or antiparallel to the direction of the cooling field. This opens up the possibility of manipulating the spin chirality for potential use in the emerging field of chiral spintronics.