Ota Shinya, Van Thach Pham, Awano Hiroyuki, Ando Akira, Toyoki Kentaro, Kotani Yoshinori, Nakamura Tetsuya, Koyama Tomohiro, Chiba Daichi
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, 567-0047, Japan.
Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan.
Sci Rep. 2021 Mar 18;11(1):6237. doi: 10.1038/s41598-021-85642-3.
This study investigates the effect of strain on the compensation temperature of ferrimagnetic Tb-Fe films formed on a flexible substrate. The compensation temperature is determined by the anomalous Hall measurement, and an application of 1.2% tensile strain reduces the compensation temperature by 12 K. X-ray magnetic circular dichroism reveals that approximately 5% of Fe magnetic moment and approximately 1% of Tb magnetic moment are reduced by an application of 0.9% tensile strain at the room temperature. To understand the greater reduction in Fe magnetization compared with that in Tb and the compensation temperature reduction simultaneously, a model applying molecular field theory is analyzed. Changes in three types of exchange coupling between Fe and Tb atoms are speculated to be caused by the strain.
本研究调查了应变对在柔性衬底上形成的亚铁磁性Tb-Fe薄膜补偿温度的影响。补偿温度通过反常霍尔测量确定，施加1.2%的拉伸应变会使补偿温度降低12 K。X射线磁圆二色性表明，在室温下施加0.9%的拉伸应变会使约5%的Fe磁矩和约1%的Tb磁矩降低。为了理解与Tb相比Fe磁化强度的更大降低以及补偿温度的同时降低，分析了应用分子场理论的模型。推测应变会导致Fe和Tb原子之间三种类型的交换耦合发生变化。
