Magnetic belt material with zero field cooling exchange bias effect and method for preparing magnetic belt material

A bias effect and magnetic band technology, applied in the field of magnetic materials and material physics, can solve the problems of high price and unfavorable industrial application of materials, and achieve the effect of low price and easy storage.

Inactive Publication Date: 2012-10-24
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the high price of the main group element indium (In), it is not conducive to the industrial application of materials

Method used

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  • Magnetic belt material with zero field cooling exchange bias effect and method for preparing magnetic belt material
  • Magnetic belt material with zero field cooling exchange bias effect and method for preparing magnetic belt material
  • Magnetic belt material with zero field cooling exchange bias effect and method for preparing magnetic belt material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 The preparation composition is Mn 50 CoNi 39 al 10 Magnetic Alloy Ribbon with Zero-Field Cooling Exchange Bias Effect

[0024] (1) Weighing ratio

[0025] According to chemical formula Mn 50 CoNi 39 al 10 Manganese (Mn) with a purity of 99.9%, cobalt (Co) with a purity of 99.9%, nickel (Ni) with a purity of 99.9% and aluminum (Al) with a purity of 99.9%.

[0026] (2) Melting ingot

[0027] Put the above weighed Mn, Co, Ni, Al blocks in the melting crucible, and pre-evacuate to 5×10 with a mechanical pump. -1 Pa; use a molecular pump to evacuate to 1×10 -4Pa, high-purity argon gas is introduced to make the internal pressure of the melting chamber reach 0.1MPa, an arc is generated, the melting current is 100A, the arc head is kept at 2-5cm above the sample and swings repeatedly in a small range for 1min, and each sample is turned over 3 times in total. Melt 4 times to make the composition of the prepared sample uniform; wait for the furnace cavity to co...

Embodiment 2

[0031] Example 2 The preparation composition is Mn 50 CoNi 37 al 12 Magnetic Alloy Ribbon with Zero-Field Cooling Exchange Bias Effect

[0032] (1) Weighing ratio

[0033] According to chemical formula Mn 50 CoNi 37 al 12 Manganese (Mn) with a purity of 99.9%, cobalt (Co) with a purity of 99.9%, nickel (Ni) with a purity of 99.9% and aluminum (Al) with a purity of 99.9%.

[0034] (2) Smelting nail material

[0035] Put the above weighed Mn, Co, Ni, Al blocks in the melting crucible, and pre-evacuate to 5×10 with a mechanical pump. -1 Pa; use a molecular pump to evacuate to 1×10 -4 Pa, high-purity argon gas is introduced to make the internal pressure of the melting chamber reach 0.1MPa, an arc is generated, the melting current is 100A, the arc head is kept at 2-5cm above the sample and swings repeatedly in a small range for 1min, and each sample is repeatedly turned over in this way for 3 times for melting 4 times to make the composition of the prepared sample uniform;...

Embodiment 3

[0039] Example 3 The preparation composition is Mn 50 CoNi 36 al 13 Magnetic alloy strip with zero-field cooling exchange bias effect

[0040] Its preparation method is the same as embodiment 2, and has measured the sample under zero-field cooling condition, the M-H curve figure of temperature T=4K and external magnetic field H=9T (such as figure 2 As shown), it is found that the hysteresis loop of the sample is shifted, which has an exchange bias effect, and the abscissas of the intersection points of the M-H closed curve and the coordinate axes are: H L =-6451.8Oe,H R =4344.6Oe, get the exchange bias field H E (H E =1053.6Oe) and coercive force H C (H C =5398.2Oe). Embodiment 4 preparation composition is Mn 50 CoNi 35 al 14 Magnetic coupling with zero-field cooling exchange bias effect

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Abstract

The invention discloses a magnetic belt material with a zero field cooling exchange bias effect. The chemical formula is Mn50CoNi49-xAlx, wherein x which refers to atomic percent content is larger than or equal to 10 and smaller than or equal to 15. The preparation method includes the steps: (1) weighing raw materials according to the chemical formula of Mn50CoNi49-xAlx; (2) containing the raw materials in a water cooling copper crucible, and preparing Mn50CoNi49-xAlx magnetic polycrystalline by means of the conventional electric arc melting method; and (3) using the smelted polycrystalline ingots to prepare the Mn50CoNi49-xAlx magnetic material by means of the rapid quenching method. Compared with existing alloy, the magnetic belt material has the advantages that the exchange bias effect under zero field cooling is achieved, and the magnetic belt material has higher magnetic field controllability, is low in cost and can be used for manufacturing of ultrahigh-density magnetic recording media, magnetic reading heads, giant magnetic resistors, spin valves, novel tunnel junction memories, sensors and the like.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a Mn with zero-field cooling exchange bias effect 50 CoNi 49-x Λl x The magnetic strip and its preparation method belong to the technical category of material physics. Background technique [0002] In 1956, Meikleijohn and Bean first observed the phenomenon of exchange bias in a Co (ferromagnetic material) particle system covered with a CoO (antiferromagnetic material) shell. When the system is cooled to 77K by applying a magnetic field through the Neel temperature of the antiferromagnetic material CoO, the hysteresis loop of the sample deviates from the origin in the direction of the cooling field, accompanied by an increase in the coercive force. This phenomenon was called is the exchange bias effect. Its physical mechanism is as follows: when the system temperature is at the Neel temperature T of the antiferromagnetic material N and the Curie temperature T of ferromagnetic materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/047C22C22/00C22C30/00B22D11/06
Inventor 马丽李国杰李远征甄聪棉侯登录
Owner HEBEI NORMAL UNIV
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