Magnetoelastic coupling effect of Fe10Co90 films grown on different flexible substrates

doi:10.1088/1674-1056/abb22d

Abstract

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 M_r/M_s and the coercive H_c 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.

Keywords: flexible substrates FeCo films magnetic anisotropy magneto-mechanical coupling effect

Received: 10 May 2020
Revised: 22 July 2020
Accepted manuscript online: 25 August 2020

Fund: the National Natural Science Foundation of China (Grant Nos. 11674336 and 11874150).

Corresponding Authors: ^†Corresponding author. E-mail: wjcheng@phy.ecnu.edu.cn ^‡Corresponding author. E-mail: qfzhan@phy.ecnu.edu.cn

Cite this article:

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 M_r/M_s and (b) the coercivity H_c 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 M_r/M_s 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 M_r/M_s and the coercive field H_c. (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 M_r/M_s ratio and the coercivity.

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Magnetoelastic coupling effect of Fe10Co90 films grown on different flexible substrates

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Magnetoelastic coupling effect of Fe₁₀Co₉₀ films grown on different flexible substrates