Spin reorientation in tetragonally distorted spinel oxide NiCo2O4 epitaxial films
Spin reorientation in tetragonally distorted spinel oxide NiCo2O4 epitaxial films
复制标题
DOI：
10.1103/physrevb.104.014422
复制
发表时间：
2021-07-20
影响因子：
3.7
通讯作者：
Yanagihara, Hideto
中科院分区：
文献类型：
--
作者：
Koizumi, Hiroki;Suzuki, Ikumi;Yanagihara, Hideto
实验研究了具有垂直磁各向异性(PMA)的NiCo2O4外延薄膜的室温磁性能。不同温度下的磁矩和磁化强度测量都为MA在一定温度(T-SR)下从PMA转变为易锥磁各向异性(ECMA)的自旋重取向转变提供了明确的实验证据。在脉冲激光沉积和反应射频磁控溅射生长的薄膜中普遍观察到ECMA，尽管T-SR取决于生长方法和条件。从c轴测得的锥角在T-SR时依次增大，在5K的最低测量温度下接近最大值45-50度。用团簇模型计算表明，占据T-d位的Ni3+离子可能是ECMA的起源。磁学性质和基于团簇模型的计算结果都表明，ECMA是由于Ni3+在薄膜生长过程中形成的阳离子反位分布所致。
We experimentally investigated the magnetic properties of NiCo2O4 epitaxial films known to be conductive oxides with perpendicular magnetic anisotropy (PMA) at room temperature. Both magnetotorque and magnetization measurements at various temperatures provide clear experimental evidence of the spin reorientation transition at which the MA changes from PMA to easy-cone magnetic anisotropy (ECMA) at a certain temperature (T-SR). ECMA was commonly observed in films grown by pulsed laser deposition and reactive radio frequency magnetron sputtering, although T-SR is dependent on the growth method as well as the conditions. The cone angles measured from the c axis increased successively at T-SR and approached a maximum of 45-50 degrees at the lowest measurement temperature of 5 K. Calculation with the cluster model suggests that the Ni3+ ions occupying the T-d site could be the origin of the ECMA. Both the magnetic properties and the results of the calculation based on the cluster model indicate that the ECMA is attributable to the cation antisite distribution of Ni3+, which is possibly formed during the growth process of the thin films.