In-plane mono-axial anisotropy test method for magnetic film material

A technology of uniaxial anisotropy and magnetic thin film, applied in the direction of material magnetic variable, etc., can solve the problem of inaccuracy, and achieve the effect of simple and accurate anisotropy in the test method

Inactive Publication Date: 2006-06-21
LANZHOU UNIVERSITY
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Problems solved by technology

However, there are some problems in these methods: firstly, how to judge the type of anisotropy of different samples (such as uniaxial or cubic); secondly, these test methods are carried out under the premise of determining the difficult and easy magnetization direction of the sample in advance, So how to accurately determine the direction of hard and easy magnetization of the film in advance becomes a problem that must be solved before the specific measurement
On the oth

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  • In-plane mono-axial anisotropy test method for magnetic film material
  • In-plane mono-axial anisotropy test method for magnetic film material
  • In-plane mono-axial anisotropy test method for magnetic film material

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Embodiment Construction

[0012] The present invention is explained below in conjunction with theoretical analysis and actual test:

[0013] figure 1 Illustrative of the apparatus tested for the present invention, this apparatus may be a vibrating sample magnetometer (VSM) experimental apparatus. Among them, 1 is an electromagnet that generates an external magnetic field, 2 is a platform for placing the sample to be tested, and 3 is a shaft that can make the platform 2 rotate. Depend on figure 1 It can be seen that when the film sample to be tested is placed on the platform 2, the applied magnetic field is parallel to the film, and at the same time the film can rotate with the rotation of the platform 2, and its rotation axis is perpendicular to the direction of the external magnetic field.

[0014] When performing the test, the plane of the film to be tested is attached to the platform 2, and at this time the plane of the film material is parallel to the direction of the external magnetic field. ...

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Abstract

The invention discloses a test technique of magnetic material, which is characterized by the following: placing the detected sample film in the extra DC magnetic field; paralleling the detected sample film plane to the extra magnetic field direction; rotating the detected sample film around the vertical axle of plane; making the detected film reach magnet saturation and extra magnet field between saturated field and coercive field; keeping the magnet field; rotating the detected sample at certain angle; measuring the spontaneous magnetization strength MS and corresponding projection value M in the ª’0 condition; calculating the M value function corresponding to different ª’0.

Description

technical field [0001] The invention relates to a testing technology for magnetic materials, more precisely, to a method for testing the in-plane uniaxial anisotropy of magnetic thin film materials. Background technique [0002] The application of magnetic materials is very extensive, ranging from various permanent magnets and soft magnetic cores to small magnetic heads and magnetic recording media used in hard disks. The use of magnetic materials is increasing day by day. At the same time, with the development of device miniaturization, magnetic thin film materials with good properties are favored by the majority of magnetic device manufacturers and magnetic material researchers. Anisotropy plays a very important role in determining the properties of magnetic thin film materials. For example, it is well known that the current capacity of hard disks is determined by the size of the particles in the magnetic recording film medium. In order to increase the recording density o...

Claims

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Application Information

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IPC IPC(8): G01N27/76
Inventor 薛德胜范小龙
Owner LANZHOU UNIVERSITY
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