Spin nano-oscillator synchronization method based on filter

Abstract

The invention discloses a spin nano-oscillator synchronization method based on a filter. The spin nano-oscillator comprises a coupling film composed of a magnetic film, and a non-magnetic heavy metalfilm located on the coupling film. At least more than two groups of spin nano-oscillators are connected in parallel; band-pass filters are arranged at the signal output ends of the spin nano-oscillators and are used for filtering signals emitted by the plurality of spin nano-oscillators; the output end of each band-pass filter generates a magnetic field parallel to the magnetic moment of a fixed layer of the spin nano-oscillator through an electromagnetic coil, and the magnetic field generates a feedback effect on the spin nano-oscillator, so that the synchronization of the plurality of spin nano-oscillators is realized. By arranging the filter, stable phase shift can be generated for signals with different frequencies, the spin nano-oscillators can be synchronized without generating a very strong feedback magnetic field, and due to the fact that the influence of the phase shift on synchronization is large, the influence of thermal noise can be greatly reduced by generating the stablephase shift.

Description

technical field [0001] The invention relates to the field of filter oscillation synchronization, in particular to a method for synchronizing a spin nanometer oscillator based on a filter. Background technique [0002] The synchronization of spin nano-oscillators means that two or more spin nano-oscillators are coupled to each other through spin waves, currents, voltages, and magnetic fields, so that the signals they send out have the same frequency and a fixed phase difference. Since the signal power output by a single STNO is very low and is affected by thermal noise, synchronization is a better solution to meet practical requirements. [0003] In the prior art, in order to study the characteristics of N electrically coupled oscillators, it is necessary to first introduce device differences, which are divided into two types, one is the difference in the parameters of the device itself, and the other is the difference in the initial conditions. Device differences mainly inc...

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Problems solved by technology

Considering thermal noise, if the χ value required by thermal noise theory is considered to be large, it is difficult for general devices to meet the requirements

Due to the delay between the resistance change and the current change, it has a great influence on the synchronization, but the research does not give a method to provide a stable phase shift

In case of thermal noise, STNO cannot effectively synchronize

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