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

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 theta0 condition; calculating the M value function corresponding to different theta0.

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...

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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 other hand, under normal circumstances, only an anisotropic equivalent field H can be obtained by measurement K , or get the anisotropy constant K u , and only H K and K u It is not accurate to describe the anisotropy of the material, because the uniaxial anisotropy of the material can be E k = K 1 sin 2 θ+K 2 sin 4 θ+..., only if the anisotropy constant K is determined at the same time 1 and K 2 , in order to more accurately describe the anisotropy of the material

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