Semimetal magnetic material with high spin polarization

A technology of magnetic materials and polarizability, applied in the direction of magnetic materials, magnetic objects, material selection, etc., can solve problems such as insufficiency, and achieve the effect of being conducive to application and promotion

Inactive Publication Date: 2011-07-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it should be noted that it is necessary but not sufficient to use this integer spin magnetic moment as a semimetal criterion.

Method used

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  • Semimetal magnetic material with high spin polarization
  • Semimetal magnetic material with high spin polarization
  • Semimetal magnetic material with high spin polarization

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The chemical formula of the material is V 2 Magnetic alloy of CoAl; the calculated spin polarizability is 100%, which is a typical semi-metallic material.

[0021] The data used in this patent is the measurement result of the sample obtained by arc melting method, and its preparation process includes the following steps:

[0022] 1. According to chemical formula V 2 CoAl ratio (x=2, y=1, N=Al, w=0), three kinds of element molar ratios V:Co:A=2:1:1, calculate the required quality of three kinds of elements accordingly; Use Electronic balance weighing, accurate to 0.0001g, mixing the raw materials into the electric arc furnace crucible; the purity of the raw materials used is greater than 99.9%;

[0023] 2. Melting by conventional arc melting method. Vacuum the electric arc furnace to 1×10-1 -1 ×10 -6 Pa, filled with argon, arc melting under 1MPa positive pressure for 2 minutes, and then cooled. Repeat the smelting 4 times in this way to make the alloy material even...

Embodiment 2

[0026] The chemical formula of the material is V 2 Magnetic alloy of MnAl (x=2, y=0, w=1, N=Al, M=Mn). The molar ratio of the three elements V:Mn:Al=2:1:1, the arc smelting pressure is 1MPa positive pressure, the time is 3 minutes, the number of repeated smelting is 3 times, and other preparation and measurement methods are the same as in Example 1. The calculated spin polarizability is 100%, which is a typical semi-metallic material. The shape of the calculated energy density curve is shown in figure 2 . The spin polarizability and saturation magnetization were measured, and the obtained values ​​are shown in Table 1.

Embodiment 3

[0028] The chemical formula of the material is V 2 Magnetic alloy of FeAl (x=2, y=0, w=1, N=Al, M=Fe). The molar ratio of the three elements V:Fe:Al=2:1:1, arc melting under the protection of flowing argon, the time is 2 minutes, the number of repeated melting is 4 times, other preparation and measurement methods are the same as in Example 1. The calculated spin polarizability is 100%, which is a typical semi-metallic material. The spin polarizability and saturation magnetization were measured, and the obtained values ​​are shown in Table 1.

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Abstract

The invention provides a semimetal magnetic material with high spin polarization. The chemical formula of the material is VxCoyNzMw, wherein N is an III-V group element; M is a transition group element; x is smaller than or equal to 2 and greater than 1; y is smaller than 2 and greater than or equal to 0; z equals to 1; w is smaller than or equal to 1 and greater than or equal to 0; and x+y+z+w equals to 4. A preparation method of the material comprises the following steps of: (1) weighing materials in the proportion of the chemical formula VxCoyNzMw, and putting the materials into an electric arc crucible, wherein N is one or more of Al, Ga, In, Si, Ge, Sn and Sb in the III-V group element, and M is one o more of V, Cr, Mn, Fe and Ni in the transition group element; (2) filling argon in an arc electric furnace after the electric arc furnace is vacuumized, cooling the materials after the materials are subjected to electric arc melting for 2-3min under the protection of a positive pressure of 0.01MPa to 1MPa or flowing argon; and repeating the melting for 3-5 times so that alloy materials are uniformly distributed, and finally obtaining the product. The spin polarization of the semimetal magnetic material is between 90% and 100%, and is between 80% and 96.2% in actual measurement; and therefore, the semimetal magnetic material represents extremely high spin polarization.

Description

technical field [0001] The present invention generally relates to high spin polarizability materials, in particular to a half-metallic magnetic material with high spin polarizability. Background technique [0002] Electrons are the unified carrier of charge and spin. During the conduction process, electrons with spin properties can exhibit unique physical effects when the material scale is equivalent to the physical characteristic length, such as giant magnetoresistance (GMR), tunneling Magnetoresistance, supermagnetoresistance effect and spin transfer, etc. In the past 100 years, microelectronics, based on the basic principle of electric field controlling the transport process of electron charge, has completely changed people's daily life. Then, can we control another property of electrons—spin, to control How about manipulating its transport behavior to create a new information age? Many scientific research achievements and industrial application facts in the field of sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/047H01L43/10C22C1/02C22C27/02
Inventor 刘国栋卢遵铭代学芳张小明刘何燕罗鸿志孟凡斌
Owner HEBEI UNIV OF TECH
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