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Magnetic storage medium film adjustable in phase-transition temperature and coercive force and manufacturing method thereof

A technology of changing temperature and coercive force, which is applied in the field of FePt/FeRh double-layer composite magnetic storage medium film, can solve the problems of changing coercive force, etc., and achieve the effect of reducing the writing magnetic field, improving stability, and preparing materials with good performance

Inactive Publication Date: 2015-01-28
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the constraints of interlayer diffusion conditions, there has been no report on its effective application to FePt / FeRh composite thin films to change the coercive force

Method used

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  • Magnetic storage medium film adjustable in phase-transition temperature and coercive force and manufacturing method thereof
  • Magnetic storage medium film adjustable in phase-transition temperature and coercive force and manufacturing method thereof
  • Magnetic storage medium film adjustable in phase-transition temperature and coercive force and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation method

[0026] 1) First, use single crystal MgO(001) as the substrate, clean it in alcohol with an ultrasonic cleaning device, and dry it with compressed air. Use tweezers to install the dried MgO(001) substrate on the sample holder of the magnetron sputtering chamber superior.

[0027] 2) The background vacuum of the high-vacuum magnetron sputtering coating chamber is better than 2×10 -5 Pa, the working Ar gas pressure is 2.8 Pa. The film forming temperature was 400°C. The purity of Fe, Pt and Rh targets is not less than 99.9%. The growth rate of Fe and Pt was controlled by the sputtering target, and the ratio of Fe atoms and Pt atoms in the FePt layer was strictly controlled at 1:1, and 25 nm thick FePt was grown on the MgO(001) substrate.

[0028] 3) After film formation, the sample was taken out and placed in a vacuum heat treatment furnace for 6 h of heat treatment at a temperature of 450 °C.

[0029] 4) Put the samples before and after heat t...

Embodiment 2

[0033] 1. Preparation method

[0034] 1) First, use single crystal MgO(001) as the substrate, clean it in alcohol with an ultrasonic cleaning device, and dry it with compressed air. Use tweezers to install the dried MgO(001) substrate on the sample holder of the magnetron sputtering chamber superior.

[0035] 2) The background vacuum of the high-vacuum magnetron sputtering coating chamber is better than 2×10 -5 Pa, the working Ar gas pressure is 2.8 Pa. The film forming temperature was 400°C. The purity of Fe, Pt and Rh targets is not less than 99.9%. The growth rate of Fe and Pt is controlled by the sputtering target, and the ratio of Fe atoms and Pt atoms in the FePt layer is strictly controlled at 1:1; 25 nm thick FePt is grown on the MgO(001) substrate.

[0036] 3) After the film is formed, the sample is taken out and placed in a vacuum heat treatment furnace for 6 h of heat treatment at a temperature of 600 °C.

[0037] 4) Put the samples before and after heat treat...

Embodiment 3

[0041] 1. Preparation method

[0042] 1) First, use single crystal MgO(001) as the substrate, clean it in alcohol with an ultrasonic cleaning device, and dry it with compressed air. Use tweezers to install the dried MgO(001) substrate on the sample holder of the magnetron sputtering chamber .

[0043] 2) The background vacuum of the high-vacuum magnetron sputtering coating chamber is better than 2×10 -5 Pa, the working Ar gas pressure is 2.8 Pa. The film forming temperature was 400°C. The purity of Fe, Pt and Rh targets is not less than 99.9%. The growth rate of Fe and Pt is controlled by the sputtering target, and the ratio of Fe atoms and Pt atoms in the FePt layer is strictly controlled at 1:1; 25 nm thick FePt is grown on the MgO(001) substrate.

[0044] 3) After the film is formed, the sample is taken out and placed in a vacuum heat treatment furnace for 6 h of heat treatment at a temperature of 700 °C.

[0045] 4) Put the samples before and after heat treatment bac...

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Abstract

Provided is a FePt / FeRh double-layer composite film adjustable in antiferromagnetic-ferromagnetic phase-transition temperature and coercive force and a manufacturing method thereof. A MgO (001) is adopted as a substrate, growth rates of Fe and Pt are controlled through a sputtering target, and the proportion of Fe atoms to Pt atoms of a FePt layer is strictly controlled to be 1:1. According to the manufacturing method, a FePt film is further transformed at varying degrees ranging from Al to L10 through vacuum heat treatment, continuous heat preservation is performed for 24 hours to enable a FeRh layer to be transformed in an order B2 phase, and finally the FePt / FeRh double-layer composite film adjustable in antiferromagnetic-ferromagnetic phase-transition temperature and coercive force is obtained and used for manufacturing a heat-assisted composite magnetic storage medium and can effectively reduce a write-in magnetic field and improve the stability during data storage. The manufacturing method is simple, a manufacturing material is good in performance, and the manufacturing method is suitable for manufacture of the FePt / FeRh double-layer composite film adjustable in antiferromagnetic-ferromagnetic phase-transition temperature and coercive force.

Description

technical field [0001] The invention relates to the field of magnetic materials, and specifically discloses an FePt / FeRh double-layer composite magnetic storage medium thin film with adjustable antiferromagnetic-ferromagnetic phase transition temperature and coercive force and a manufacturing method thereof. Background technique [0002] In recent years, exchange bias and exchange elasticity have been paid attention to in fields such as magnetic heads, magnetic storage media, tunnel junctions, spin valves, and high-performance membrane-type micro permanent magnets. The exchange bias can stabilize the magnetic moment of ferromagnetic particles and increase the coercive force. The exchange elasticity effect helps to promote the magnetic moment reversal of the hard magnetic particles and reduce the coercive force. [0003] Ordered B The 2-phase FeRh alloy has a body-centered tetragonal (bct) structure, and an antiferromagnetic-ferromagnetic first-order phase transition occurs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/851C23C14/35C23C14/16
Inventor 李国庆谭兴文林跃强
Owner SOUTHWEST UNIV
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