Ferromagnetic Resonance of a [GeTe/Sb2Te3]6/Py Superlattice

Magnetochemistry

Hiroyuki Awano¹  Yuichiro Hirano¹  Satoshi Sumi¹  Junji Tominaga² 

[1] Department of Advanced Science and Technology, Toyota Technological Institute, Nagoya 468-8511, Japan;Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan;

关键词: topological insulator;    superlattice;    ST-FMR;    spin Hall angle;    spintronics;   

DOI  :  10.3390/magnetochemistry7120156

来源: DOAJ

【 摘 要 】

A [GeTe/Sb₂Te₃] superlattice is known as a topological insulator. It shows magnetic responses such as magneto-optical effect, magneto resistance, magneto capacitance, and so on. We have reported that [GeTe/Sb₂Te₃] superlattice film has a large spin–orbit interaction using a spin pumping method of a [GeTe/Sb₂Te₃]/Py superlattice. In this paper, we demonstrate a ST-FMR (spin transfer torque ferromagnetic resonance) of the [GeTe/Sb₂Te₃]₆/Py superlattice, compared with a W/Py bilayer. The superlattice film showed a large resonance signal with a symmetric component. The ratio of symmetric components (S) to anti-symmetric (A) components (S/A) was 1.4, which suggests that the superlattice exhibits a large spin Hall angle. The [GeTe/Sb₂Te₃] superlattice will be suitable as a hetero-interface material required for high performance spintronics devices in future.

【 授权许可】

Unknown