Method for detecting spin wave information transmission frequency

Abstract

The invention discloses a method for detecting a spin wave information transmission frequency, and belongs to the technical field of the spin wave detection. The method comprises the following steps:exciting an incident spin wave from one side of a magnetic domain wall loaded with a spin wave to be detected, enabling the incident spin wave to pass through the magnetic domain wall and interact with the spin wave to be detected so as to form a transmission spin wave, and analyzing to obtain an interval of frequencies between the transmission spin wave and the incident spin wave, namely the frequency of the spin wave transmitted along the magnetic domain wall. The method is capable of dynamically monitoring and analyzing to obtain the frequency and the wave vector information of the spin wave transmitted along the magnetic domain wall. Compared with a Brillouin light scattering spectrum technology (BLS) which is used for detecting the information of the spin wave transmitted in the magnetic domain wall at the present stage, the method does not need to determine an accurate position of the magnetic domain wall, and a magnetic structure cannot be damaged, so the real-time monitoring inan information transmission process is realized, and the method has the advantages of simple and convenient 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...

AI Technical Summary

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.

Images