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Vertical magnetism anisotropic film

An anisotropic and anisotropic field technology, applied in the application of magnetic film to substrate, magnetic layer, etc., can solve problems such as difficult to flip, high coercive force, unsuitable, etc., to meet ultra-high sensitivity and storage The effect of adjustable density and coercive force

Inactive Publication Date: 2010-01-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

But so far, the properties of all perpendicular magnetic anisotropic films are not very ideal, especially their coercive force is too high, it is difficult to flip, and they are not suitable for computer readout heads or magnetic field sensors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] According to the above film composition, the following 12 kinds of Tb were prepared by magnetron co-sputtering x (Co 2 FeZ) y thin film, which is characterized in that the Z position can be Al, Si and other elements, Co 2 FeZ is a semimetallic Heusler alloy component.

[0008]

[0009] As shown in the table above, the above Tb x (Co 2 FeZ) y The films all exhibit perpendicular magnetic anisotropy, the perpendicular magnetic anisotropy field is between 5000Oe and 11000Oe, and the coercive force decreases with the decrease of Tb and Fe atomic ratio x:y. Sampling tests show that the film still maintains perpendicular magnetic anisotropy after annealing at 300°C.

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Abstract

The invention relates to a vertical magnetism anisotropic film which belongs to the field of magnetic materials, and an easy magnetizing shaft is perpendicular to a film plane. The vertical magnetism anisotropic film is characterized by comprising the component: Tbx(Co2FeZ)y, wherein Z stands for Al, Si, and the like, Co2FeZ is a semimetal Heusler alloy component, and Tb and Fe have an atomic ratio: x: y is greater than 0.2 and is less than 2. The vertical magnetism anisotropic film has a high vertical magnetism anisotropic field and can regulate coercive force by controlling the atomic component ratio, the coercive force of the vertical magnetism anisotropic film is obviously lower than the coercive force of the traditional vertical magnetism anisotropic film, and therefore, the vertical magnetism anisotropic film can be used as a ferromagnetic layer to be applied to a vertical spin valve or a magnetic tunnel-junction. When used, the vertical magnetism anisotropic film can overcome magnetic curliness and vortex magnetic domain structure under a small size, has adjustable coercive force and can satisfy the use requirement of a magnetic sensor or a memory with ultrahigh sensitivity and memory density.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a novel perpendicular magnetic anisotropic thin film, the direction of the easy magnetization axis of which is perpendicular to the plane of the thin film. Background technique [0002] In recent years, magnetic storage technology has developed rapidly, the magnetic storage density has been continuously increased, and the size of the storage unit has been gradually reduced. The magnetization directions of the currently used magnetic metal nano-films are all in the film plane, that is, they have in-plane magnetic anisotropy. shrinkage (magnetization curling), eddy current magnetization (Vortex magnetization), and even superparamagnetism. In response to these problems, some scholars have proposed a magnetic metal nano-multilayer film with magnetic anisotropy perpendicular to the film surface [S.Maat et al., Phys.Rev.Lett. The easy axis of anisotropy is perpendicular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F10/12H01F41/14
Inventor 徐晓光李晓其姜勇
Owner UNIV OF SCI & TECH BEIJING
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