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Highly Flexible and Twistable Freestanding Single Crystalline Magnetite Film with Robust Magnetism
Author(s) -
An Feng,
Qu Ke,
Zhong Gaokuo,
Dong Yongqi,
Ming Wenjie,
Zi Mengfei,
Liu Zhijie,
Wang Yadong,
Qi Biyun,
Ding Zhen,
Xu Jun,
Luo Zhenlin,
Gao Xingsen,
Xie Shuhong,
Gao Peng,
Li Jiangyu
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202003495
Subject(s) - materials science , magnetism , magnetite , bent molecular geometry , magnetization , superparamagnetism , layer (electronics) , thin film , nanotechnology , composite material , condensed matter physics , magnetic field , metallurgy , physics , quantum mechanics
Magnetic materials and devices that can be folded and twisted without sacrificing their functional properties are highly desirable for flexible electronic applications in wearable products and implantable systems. In this work, a high‐quality single crystalline freestanding Fe 3 O 4 thin film with strong magnetism has been synthesized by pulsed laser deposition using a water‐dissolvable Sr 3 Al 2 O 6 sacrificial layer, and the resulting freestanding film, with magnetism confirmed at multiple length scales, is highly flexible with a bending radius as small as 7.18 µm and twist angle as large as 122°, in sharp contrast with bulk magnetite that is quite brittle. When transferred to a polydimethylsiloxane support layer, the Fe 3 O 4 film can be bent with large deformation without affecting its magnetization, demonstrating its robust magnetism. The work thus offers a viable solution for flexible magnetic materials that can be utilized in a range of applications.