Mechanically tunable exchange coupling of Co/CoO bilayers on flexible muscovite substrates

Thai Duy Ha, Min Yen, Yu Hong Lai, Chang Yang Kuo, Chien Te Chen, Arata Tanaka, Li Zai Tsai, Yi Feng Zhao, Chun Gang Duan, Shang Fan Lee, Chun Fu Chang, Jenh-Yih Juang*, Ying-hao Chu*

*此作品的通信作者

研究成果: Article同行評審

8 引文 斯高帕斯(Scopus)

摘要

The employment of flexible muscovite substrates has given us the feasibility of applying strain to heterostructures dynamically by mechanical bending. In this study, this novel approach is utilized to investigate strain effects on the exchange coupling in ferromagnetic Co and anti-ferromagnetic CoO (Co/CoO) bilayers. Two different Co/CoO bilayer heterostructures were grown on muscovite substrates by oxide molecular beam epitaxy, with the CoO layer being purely (111)- and (100)-oriented. The strain-dependent exchange coupling effect can only be observed on Co/CoO(100)/mica but not on Co/CoO(111)/mica. The origin of this phenomenon is attributed to the anisotropic spin re-orientation induced by mechanical bending. The strain-dependent magnetic anisotropy of the bilayers determined by anisotropic magnetoresistance measurements confirms this conjecture. This study elucidates the fundamental understanding of how magnetic exchange coupling can be tuned by externally applied strain via mechanical bending and, hence, provides a novel approach for implementing flexible spintronic devices.

原文English
頁(從 - 到)3284-3291
頁數8
期刊Nanoscale
12
發行號5
DOIs
出版狀態Published - 7 2月 2020

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