1 Key Laboratory of Polar Materials and Devices (MOE) and State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China 2 Engineering Research Center for Nanophotonics and Advanced Instrument, School of Physics and Electronic Science, East China Normal University, Ministry of Education, Shanghai 200241, China
The magneto–mechanical coupling effect and magnetic anisotropy of Fe10Co90 (FeCo) films deposited on silicon wafer (Si), flexible polyethylene terephthalate (PET), freestanding polydimethylsiloxane (PDMS), and pre-stretched 20% PDMS substrates were studied in detail. The loop squareness ratio Mr/Ms and the coercive Hc of the FeCo film grown on a PET substrate can be obviously tuned by applying a small tensile-bending strain, and those of the FeCo film grown on a freestanding PDMS substrate can only be slightly changed when applying a relatively large tensile bending strain. For the FeCo film prepared on a 20% pre-stretched PDMS, a wrinkled morphology is obtained after removing the pre-strain. The wrinkled FeCo film can keep the magnetic properties unchanged when applying a relatively large tensile bending strain perpendicular to the wrinkles. This reveals that PDMS is an ideal substrate for magnetic films to realize flexible immutability. Our results may help for developing flexible magnetic devices.
Jiapeng Zhao(赵佳鹏), Qinhuang Guo(郭勤皇), Huizhong Yin(尹慧中), Jintang Zou(邹锦堂), Zhenjie Zhao(赵振杰), Wenjuan Cheng(程文娟), Dongmei Jiang(蒋冬梅), and Qingfeng Zhan(詹清峰) Magnetoelastic coupling effect of Fe10Co90 films grown on different flexible substrates 2020 Chin. Phys. B 29 117501
Fig. 1.
AFM images (10 × 10 μm2) of bare substrates of (a) rigid Si, (b) flexible PET, and (c) soft PDMS. AFM images (10 × 10 μm2) of the stacks of Ta(6 nm)/FeCo(40 nm)/Ta(6 nm) deposited on (d) Si, (e) PET, and (f) PDMS substrates.
Fig. 2.
Angular dependence of (a) the loop squareness ratio Mr/Ms and (b) the coercivity Hc for the FeCo films grown on Si, PET, and freestanding PDMS substrates. The hysteresis loops measured along the easy axis (EA) and the hard axis (HA) for the FeCo films grown on Si, PET, and freestanding PDMS substrates.
Fig. 3.
Hysteresis loops for FeCo films grown on the PET substrate acquired with magnetic field applied along (a) the easy axis (EA) and (b) the hard axis (HA) with different external tensile bending strains applied along the hard axis and the easy axis, respectively. Hysteresis loops for FeCo films grown on the freestanding PDMS substrate acquired with magnetic field applied along (c) the easy axis and (d) the hard axis with different external tensile bending strains applied along the hard axis and the easy axis, respectively. The insets correspondingly show the tensile bending strain dependence of the Mr/Ms ratio and the coercivity.
Fig. 4.
(a) AFM image (40 × 40 μm2) for the wrinkled FeCo film grown on a 20% pre-stretched PDMS. (b) The corresponding angular dependence of the loop squareness ratio Mr/Ms and the coercive field Hc. (c) The typical hysteresis loops for the wrinkled FeCo film measured along the easy and hard axes. Hysteresis loops for the wrinkled FeCo film acquired along (d) the easy axis and (e) the hard axis with different external tensile bending strains applied perpendicular and parallel to the wrinkles, respectively. The insets correspondingly show the tensile bending strain dependence of the Mr/Ms ratio and the coercivity.
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The 50 nm-thick yttrium iron garnet films with perpendicular magnetic anisotropy Shuyao Chen(陈姝瑶), Yunfei Xie(谢云飞), Yucong Yang(杨玉聪), Dong Gao(高栋), Donghua Liu(刘冬华), Lin Qin(秦林), Wei Yan(严巍), Bi Tan(谭碧), Qiuli Chen(陈秋丽), Tao Gong(龚涛), En Li(李恩), Lei Bi(毕磊), Tao Liu(刘涛), and Longjiang Deng(邓龙江). Chin. Phys. B, 2022, 31(4): 048503.
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