Flexible magnetic thin films and devices

Abstract

Flexible electronic devices are highly attractive for a variety of applications such as flexible circuit boards, solar cells, paper-like displays, and sensitive skin, due to their stretchable, biocompatible, light-weight, portable, and low cost properties. Due to magnetic devices being important parts of electronic devices, it is essential to study the magnetic properties of magnetic thin films and devices fabricated on flexible substrates. In this review, we mainly introduce the recent progress in flexible magnetic thin films and devices, including the study on the stress-dependent magnetic properties of magnetic thin films and devices, and controlling the properties of flexible magnetic films by stress-related multi-fields, and the design and fabrication of flexible magnetic devices.

Magnetization-induced shape transformations in flexible ferromagnetic rings

“…Soft magnetic materials which can change their configuration under the action of external electric or magnetic fields find applications in diverse areas of science and technology. They are used in the fabrication of materials and devices for shapeable magnetoelectronics [1,2], programmable magnetic materials [3,4] and numerous interactive human-machine interfaces [5,6]. A possibility to control geometry of the magnet by means of the external magnetic field that acts on the magnetic subsystem opens exciting opportunities in the engineering of miniature robots [3,4,6].…”

Recent research progress in biomimetic tactile sensors

“…近年来, 仿生触觉传感器在器件结构设计 [15] 、集 成阵列 [16] 等方面的研究取得众多进展, 未来也将朝着 功能多样化集成、适用于大规模生产的工艺路线等方 向发展. 可以预见的是, 它和其他领域的学科交叉融 合, 与其他柔性电子器件如柔性电路、柔性太阳能电 池、柔性磁器件等结合 [17,18] , 在医疗健康 [19] 、软机器 人 [20] 、可穿戴式设备 [21] 和假肢 [22] 等方面展示出巨大 的应用潜力. [23] .…”

Strain engineered domain structure and their relaxation in perpendicularly magnetized Co/Pt deposited on flexible polyimide

“…Miniaturization and flexibility with high speed and low power consumption are the key aspects for developing next generation spintronic devices [1][2][3]. Perpendicular magnetic anisotropic (PMA) systems such as Co/Pt bilayes have shown their importance in increasing thermal stability and developing non-volatile magnetic random access memories (MRAM's) with low current density requirement for magnetization switching at 20 nm bit size level [1,[4][5][6][7][8][9].…”

“…Such mechanical methods transfer almost uniform stress from substrate to the film, which gives rise to device flexibility. In recent years the effect of stress application on magnetic anisotropy and domain structure in various magnetic films with in-plane MA have been studied [3,20]. However, the stress effect in flexible PMA films is less explored.…”