Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures
Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures
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DOI：
10.1021/acsaelm.2c00523
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发表时间：
2022-05
影响因子：
4.7
通讯作者：
Nirjhar Bhattacharjee;K. Mahalingam;A. Fedorko;A. Will-Cole;Jaehyeon Ryu;M. Page;M. McConney;Hui Fang;D. Heiman;N. Sun
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文献类型：
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作者：
Nirjhar Bhattacharjee;K. Mahalingam;A. Fedorko;A. Will-Cole;Jaehyeon Ryu;M. Page;M. McConney;Hui Fang;D. Heiman;N. Sun
． 拓扑绝缘体（TIs）与铁磁体（FMs）耦合的薄膜是高效节能自旋电子学器件的理想选择。本文报道了TI晶体结构紊乱对溅射沉积TI/FM， Bi 2 Te 3 /Ni 80 Fe 20异质结构界面和磁性能的影响。Ni和少量来自Py的Fe在界面上扩散并与bi2te 3反应。对于高结晶c轴取向的bi2te 3薄膜，观察到吉尔伯特阻尼的巨大增强，伴随着有效的面外磁各向异性和增强的类阻尼自旋轨道扭矩（DL-SOT），可能是由于bi2te 3的拓扑表面态（TSS）。此外，在低温下的磁滞回线测量中观察到自发交换偏置。这是由于扩散的Ni与bi2te 3反应形成反铁磁拓扑界面层，并与FM， ni80fe20偶联。随着Bi - 2 - Te - 3无序性的增加，AFM界面层的交换作用明显减弱。这些实验结果摘要长度为一段。
. Thin films of Topological insulators (TIs) coupled with ferromagnets (FMs) are excellent candidates for energy-efficient spintronics devices. Here, the effect of crystalline structural disorder of TI on interfacial and magnetic properties of sputter-deposited TI/FM, Bi 2 Te 3 /Ni 80 Fe 20 , heterostructures is reported. Ni and a smaller amount of Fe from Py was found to diffuse across the interface and react with Bi 2 Te 3 . For highly crystalline c- axis oriented Bi 2 Te 3 films, a giant enhancement in Gilbert damping is observed, accompanied by an effective out-of-plane magnetic anisotropy and enhanced damping-like spin-orbit torque (DL-SOT), possibly due to the topological surface states (TSS) of Bi 2 Te 3 . Furthermore, a spontaneous exchange bias is observed in hysteresis loop measurements at low temperatures. This is because of an antiferromagnetic topological interfacial layer formed by reaction of the diffused Ni with Bi 2 Te 3 which couples with the FM, Ni 80 Fe 20 . For increasing disorder of Bi 2 Te 3 , a significant weakening of exchange interaction in the AFM interfacial layer is found. These experimental results Abstract length is one paragraph.