Advanced Materials

Ionic-Liquid-Gating Control of Spin Reorientation Transition and Switching of Perpendicular Magnetic Anisotropy

Author Shishun Zhao

Shishun Zhao, Lei Wang, Ziyao Zhou*, Chunlei Li, Guohua Dong, Le Zhang, Bin Peng, Tai Min, Zhongqiang Hu, Jing Ma, Wei Ren, Zuo-Guang Ye, Wei Chen, Pu Yu, Ce-Wen Nan, Ming Liu*, Ionic-Liquid-Gating Control of Spin Reorientation Transition and Switching of Perpendicular Magnetic Anisotropy, Advanced Materials (2018)

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Abstract

The trend of mobile Internet requires portable and wearable devices as bio-device interfaces. Electric field control of magnetism is a promising approach to achieve compact, light-weight, and energy-efficient wearable devices. Within a flexible sandwich heterostructure, perpendicular magnetic anisotropy switching was achieved via low-voltage gating control of an ionic gel in mica/Ta/(Pt/Co)x/Pt/ionic gel/Pt, where (Pt/Co)x acted as a functional layer. By conducting in situ VSM, EPR, and MOKE measurements, a 1098 Oe magnetic anisotropy field change was determined at the bending state with tensile strain, corresponding to a magnetic anisotropy energy change of 3.16 × 105 J/m3 and a giant voltage tunability coefficient of 0.79 × 105 J/m3·V. The low voltage and strain dual control of magnetism on mica substrates enables tunable flexible spintronic devices with an increased degree of manipulation.