Voltage-controlled significant spin wave Doppler shift in FM/FE heterojunction

TL;DR

This paper demonstrates voltage-controlled manipulation of spin wave Doppler shift in FM/FE heterojunctions, enabling wide-band shifts and potential applications in black hole analogue systems.

Contribution

It introduces a novel voltage control method for spin wave Doppler shift via magnetic anisotropy boundary movement in FM/FE heterostructures, verified by simulations.

Findings

SW Doppler shift aligns with theoretical predictions

Achieves ultra wide-band shift over 5 GHz with voltage

Potential application in measuring Hawking radiation

Abstract

Efficient manipulation of spin waves (SWs) is considered as one of the promising means for encoding information with low power consumption in next generation spintronic devices. The SW Doppler shift is one important phenomenon by manipulating SWs propagation. Here, we predict an efficient way to control the SW Doppler shift by voltage control magnetic anisotropy boundary (MAB) movement in FM/FE heterojunction. From the micromagnetic simulation, we verified that the SW Doppler shift aligns well with our theoretical predictions in Fe/$\rm BaTiO_3$ heterostructure. The SW Doppler shift also shows ultra wide-band shift (over 5 GHz) property with voltage. Such efficient SW Doppler shift may provide one possible way to measure the Hawking radiation of an analogue black hole in the SW systems.