Method for measuring flexible magnetic film saturated magnetostriction coefficient

A technology of magnetostrictive coefficient and magnetic thin film, which is applied in the measurement of magnetostrictive performance and magnetic performance, etc., can solve the problems of complexity, no measurement method, difficult calibration, etc., and achieve the effect of low cost and fast measurement.

Active Publication Date: 2013-01-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

Although this method has high measurement accuracy, the circuit of the measurement system is complicated and the correction is difficult.
[0008] In summary, the current measurement system for the saturation magnetostriction coefficient of magnetic thin films is relatively complicated; moreover, there is no special measurement method for the magnetostriction coefficient of flexible magnetic films

Method used

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  • Method for measuring flexible magnetic film saturated magnetostriction coefficient
  • Method for measuring flexible magnetic film saturated magnetostriction coefficient
  • Method for measuring flexible magnetic film saturated magnetostriction coefficient

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Embodiment 1

[0039] In this embodiment, the flexible magnetic film is FeGa(10nm) / IrMn(20nm) / Ta(30nm) / PET exchange bias film, that is, a Ta film layer with a thickness of 30nm is sequentially stacked on a flexible PET substrate, and the thickness is The measurement of the saturation magnetostriction coefficient of the 20nm IrMn thin film layer and the FeGa thin film layer with a thickness of 10nm includes the following steps:

[0040] (1) Place the film sample on the surface of the flat mold 301, such as Figure 2a As shown, the mold 301 does not apply strain to the film sample to obtain an unstrained film sample 302; the flat mold 301 is installed on the MOKE test system, and the magnetization curve of the unstrained film sample 302 placed on the surface of the mold 301 is measured in longitudinal mode Measured, the hard axis magnetization curve is shown as the solid line in Figure 2, and the anisotropic field H of the strain-free film sample 302 is obtained k1 =170Oe;

[0041] (2) Use a convex...

Embodiment 2

[0046] In this embodiment, the flexible magnetic film is a FeGa (20nm) / PET film, that is, an FeGa film layer with a thickness of 20nm is grown on a flexible PET substrate. The saturation magnetostriction coefficient measurement of the film includes the following steps:

[0047] (1) Similar Figure 2a As shown, the film sample is placed on the surface of a flat mold, and the mold does not apply strain to the film sample to obtain an unstrained film sample; the flat mold is installed on the MOKE test system, and the unstrained film placed on the surface of the flat mold is aligned in the longitudinal mode The magnetization curve of the sample is measured. The hard-axis magnetization curve is shown as the solid line in Figure 3, and the anisotropic field H of the strain-free film is obtained. k1 =250Oe;

[0048] (2) Similar Figure 2b As shown, using a convex non-magnetic mold with a fixed radius of curvature of ρ=7.4cm, the film sample is placed on the curved surface of the convex mol...

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Abstract

The invention provides a method for measuring a flexible magnetic film saturated magnetostriction coefficient. The method comprises the steps of: adopting a nonmagnetic mould which is made of a nonmagnetic material and has a fixed radius of curvature to generate strain on a flexible magnetic film so as to obtain a stress difference deltasigma between the condition of applied stress and the condition of no stress; then utilizing a magneto-optic kerr effect testing system to measure variable quantity deltaHK of an anisotropy field of the flexible magnetic film sample at the presence of strain and at the absence of the strain; and directly calculating to obtain a saturated magnetostriction coefficient gammas of the flexible magnetic film through a saturated magnetostriction coefficient formula gammas=deltaHkMs / (3deltasigma). Compared with the conventional magnetostriction coefficient measurement method of the magnetic film, the method for measuring the flexible magnetic film saturated magnetostriction coefficient, disclosed by the invention, has the advantages of high measurement precision, simple and practicable performances, low cost and good application foreground.

Description

Technical field [0001] The invention relates to the technical field of measuring the magnetostriction coefficient of magnetic materials, in particular to a method for measuring the saturation magnetostriction coefficient of a flexible magnetic film. Background technique [0002] Different magnetic materials have different deformations under the action of a magnetic field. The magnetostriction coefficient λ is usually used to characterize the deformation, that is, λ=ΔL / L. The saturation magnetostriction coefficient λs of ordinary magnetic materials is about 10 -5 , The saturation magnetostriction coefficient of giant magnetostrictive amorphous film can reach 10 -4 . Therefore, the magnetostrictive effect of giant magnetostrictive film is much greater than that of ordinary magnetic materials, and it has a good application prospect in stress sensing and magnetic driving of microelectromechanical systems (MEMS). [0003] Magnetostrictive films are usually grown on the surface of a sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/18
Inventor 詹清峰张晓山刘宜伟代国红李润伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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