A method to detect the frequency of spin wave information transmission

Abstract

A method for detecting the transmission frequency of spin wave information belongs to the technical field of spin wave detection. The present invention excites an incident spin wave on one side of the magnetic domain wall carrying the spin wave to be measured, so that the incident spin wave passes through the magnetic domain wall and interacts with the spin wave to be measured to form a transmitted spin wave, which is obtained by analysis The frequency interval between the transmitted spin wave and the incident spin wave is the frequency of the spin wave propagating along the magnetic domain wall. The invention can dynamically monitor and analyze the frequency and wave vector information of the spin wave propagating along the magnetic domain wall, compared with the current stage using Brillouin light scattering spectroscopy (BLS) to detect the spin wave information propagating inside the magnetic domain wall Specifically, the present invention does not need to determine the precise position of the magnetic domain wall, and does not destroy the magnetic structure, realizes real-time monitoring in the process of information transmission, and also has the advantages of simple operation, low cost, and good detection effect.

Description

technical field [0001] The invention belongs to the technical field of spin wave detection, and in particular relates to a method for detecting the transmission frequency of spin wave information. Background technique [0002] For now, most of the microwave ferrite devices we usually use and manufacture utilize the property that the magnetic moments in ferrite precess consistently around the external magnetic field. In fact, consistent precession is just a form of magnetic moment motion. Non-uniform precession with unequal phase and amplitude between adjacent magnetic moments also exists, and this non-uniform precession form is generally called spin wave. With the continuous deepening of the research on spin waves, it is found that spin waves can be used as information transmission carriers, and have unique propagation characteristics: electrons will not move during the information transmission process. Therefore, the use of spin waves to transmit information can avoid the...

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Problems solved by technology

The above method guarantees the security of information transmission to a certain extent, but the ensuing problem is how to detect the spin wave information in the magnetic domain wall

At present, Brillouin light scattering spectroscopy (BLS) is mainly used. BLS technology has strict requirements for light intensity control. If the intensity is too high, it will reduce the saturation magnetization of the material or even destroy the magnetic structure of the material; Scanning method is used for detection. Since the spin wave is bound to the magnetic domain wall and can only propagate along the magnetic domain wall, the spin wave information in the magnetic domain wall can only be read when the scanning light reaches the position of the magnetic domain wall. If the scanning interval is large, the position information of the magnetic domain wall will be missed, but if the scanning interval is set small, it usually requires complicated operations and takes a long time, which is inconvenient to operate and low in detection efficiency.

Therefore, due to the difficulty of accurately determining the position of the magnetic domain wall that carries the information and the limitations of the line scanning method itself, the practical application of the BLS technology to detect the spin wave information in the magnetic domain wall is limited.

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