Method for increasing diffusion length of magnon

A technology of diffusion length and magnon, applied in the field of electronics, can solve the problems of energy waste, temperature increase, lattice vibration intensification, etc., and achieve the effect of increasing diffusion length and increasing diffusion length.

Inactive Publication Date: 2018-06-05
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0002] Traditional electronic devices, such as resistors, capacitors, inductors, diodes, triodes, transistors, etc., usually only use the charge properties of electrons. At

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  • Method for increasing diffusion length of magnon
  • Method for increasing diffusion length of magnon

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Embodiment Construction

[0015] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] The present invention uses laser to change Y 3 Fe 5 o 12 The electronic configuration in , and generate temperature gradient, and then generate non-equilibrium magnon, wherein the non-equilibrium magnon generated by temperature gradient mainly utilizes the spin Seebeck effect (spin Seebeck effect, SSE). This is a spin current generation method discovered by young Japanese scientists Uchida et al. in 2008. The principle is to apply a temperature gradient at both ends of the magnetic material. At this time, electrons with different spin directions are at different temperatures If the chemical potential of the position is different, electrons with different spin directions will be accumulated at the cold end and the hot end, thereby realizing spin polarization and spin accumulation. And this kind of s...

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Abstract

The invention discloses a method for increasing the diffusion length of a magnon. The method comprises the following steps: firstly, 40 nm YIG (Y3Fe5O12) is grown on a gadolinium gallium garnet substrate by a pulsed laser deposition method, and after that, a strip-shaped Pt electrode is prepared on YIG by a magnetron sputtering method; the surface of a sample is irradiated by a focused laser beam,and a temperature gradient perpendicular to the surface of the sample is formed on an irradiated part; an unbalanced magnon is generated by parameters of a spin Seebeck effect, the unbalanced magnonperforms in-plane diffusion, a reverse spin Seebeck effect is generated in the Pt electrode when the unbalanced magnon reaches the Pt electrode, and voltage is further generated. The position of a light spot is changed to detect the voltage in Pt, so that the diffusion length of the magnon can be detected. The diffusion length of the YIG magnon is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of electronics and relates to a method for increasing the diffusion length of magnons. Background technique [0002] Traditional electronic devices, such as resistors, capacitors, inductors, diodes, triodes, transistors, etc., usually only use the charge properties of electrons. At this time, the movement of electrons will collide with the crystal lattice, causing the lattice vibration to intensify, thus causing An increase in temperature results in a waste of energy. If another property of electrons, spin, is used, it is expected to build more efficient electronic devices. Once it was proposed, it has attracted widespread attention. The spin current in the spintronic device is different from the previous charge flow. One of its most important features is that it does not require the movement of electrons, which greatly reduces the scattering of electrons by phonons, thereby reducing the generation of Joule...

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Application Information

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IPC IPC(8): H01L43/14G01B7/02
CPCG01B7/02G01B7/023H10N52/01
Inventor 王拴虎王建元金克新闫虹张兆亭王民
Owner NORTHWESTERN POLYTECHNICAL UNIV
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