Magnetic anisotropy and high-frequency property of flexible FeCoTa films obliquely deposited on a wrinkled topography

Jincai Li; Qingfeng Zhan; Shuanglan Zhang; Jinwu Wei; Jianbo Wang; Minjie Pan; Yali Xie; Huali Yang; Zheng Zhou; Shuhong Xie; Baomin Wang; Run-Wei Li

doi:10.1038/s41598-017-03288-6

Magnetic anisotropy and high-frequency property of flexible FeCoTa films obliquely deposited on a wrinkled topography

Sci Rep. 2017 Jun 6;7(1):2837. doi: 10.1038/s41598-017-03288-6.

Authors

Jincai Li^{1

2}, Qingfeng Zhan³, Shuanglan Zhang¹, Jinwu Wei⁴, Jianbo Wang⁴, Minjie Pan¹, Yali Xie¹, Huali Yang¹, Zheng Zhou¹, Shuhong Xie², Baomin Wang¹, Run-Wei Li⁵

Affiliations

¹ CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People's Republic of China.
² Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan, 411105, People's Republic of China.
³ CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People's Republic of China. zhanqf@nimte.ac.cn.
⁴ Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou, 730000, People's Republic of China.
⁵ CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, People's Republic of China. runweili@nimte.ac.cn.

Abstract

We investigated the magnetic anisotropy and the high-frequency property of flexible Fe₆₀Co₂₆Ta₁₄ (FeCoTa) thin films obtained by oblique sputtering onto a wrinkled surface. The sinuously wrinkled topography is produced by growing Ta layer on a pre-strained polydimethylsiloxane (PDMS) membrane. Due to the enhanced effect of shadowing, the oblique deposition of FeCoTa layer gives rise to a shift of wrinkle peak towards the incident atomic flux. With increasing the PDMS pre-strain or increasing the oblique sputtering angle, both the uniaxial magnetic anisotropy and the ferromagnetic resonance frequency of FeCoTa films are enhanced, but the initial permeability decreases. The magnetization reversal mechanism of wrinkled FeCoTa films can be interpreted by a two-phase model composed of both coherent rotation and domain wall nucleation. With the enhancement of uniaxial magnetic anisotropy, the domain wall nucleation becomes pronounced in FeCoTa films.

Publication types

Research Support, Non-U.S. Gov't