Progress in Stress Controlling Magnetic Anisotropy of Flexible Magnetostrictive Thin Films

Magnetostrictive material Fe81Ga19 alloy has the advantages of low saturation field (~100 Oe), good ductility, and moderate amount of stretching (~350 ppm), and has broad application prospects in the field of sensors and actuators. In microelectromechanical systems as well as multifunctional composites, it is crucial to obtain stress-sensitive magnetostrictive films. In previous related studies, magnetostrictive thin films grown on rigid substrates have sharply reduced sensitivity in stress sensing and magnetoelectric coupling due to the constraints of the substrate. In recent years, magnetic thin films and spintronic devices based on flexible substrates have attracted widespread interest. Flexible substrates have small Young’s modulus and are easily deformed. become more sensitive.

At present, Li Runwei’s research team from the Key Laboratory of Magnetic Materials and Devices of the Chinese Academy of Sciences has prepared a Fe81Ga19 polycrystalline film with excellent performance on a flexible substrate PET (polyethylene terephthalate). The magnetic uniaxial anisotropy (1.81×105erg/cm3). Furthermore, we regulated the magnetic anisotropy of Fe81Ga19 thin films by applying different degrees of stress on the easy axis and hard axis by bending strain. The results show that under the action of stress, the easy axis of Fe81Ga19 film can be regulated into the hard axis, and vice versa. Considering the angular distribution of the easy axis of magnetization in polycrystalline films and improving the Stoner-Wohlfarth model, we theoretically provide a qualitative interpretation of the experimental results of stress-tunable uniaxial magnetic anisotropy.

The research results have important guiding significance for the research and development of flexible magnetoelectronic devices, and the paper was published in Appl. ), the research work was supported by the 973 sub-project, the National Natural Science Foundation of China (11174302), the National Key Basic Research Project (2012CB933004), and the Ningbo Science and Technology Innovation Team (2011B82004, 2009B21005).

Magnetic Anisotropy of Flexible Magnetostrictive Thin Films

Magnetic Anisotropy of Flexible Magnetostrictive Thin Films

Figure (a) The relationship between the squareness ratio and the degree of strain by applying transverse bending strain with the magnetic field along the easy or hard axis direction and parallel to the membrane surface.

Figure (b) The squareness ratio as a function of Ke/Ms calculated by the improved Stoner-Wohlfarth model.

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