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Control of Spin-wave Polarity and Velocity Using a Ferrimagnetic Domain Wall by Faridi, Ehsan; Vignale, Giovanni; Kim, Se Kwon is a scholarly article available to read on EtoBox.

What is Control of Spin-wave Polarity and Velocity Using a Ferrimagnetic Domain Wall about?

We present a theoretical study of the scattering of spin waves by a domain wall (DW) in a ferrimagnetic (FiM) spin chain in which two sublattices carry spins of unequal magnitudes. We find that a narrow, but atomically smooth FiM DW exhibits a different behavior in comparison with similarly smooth ferromagnetic and antiferromagnetic DWs due to the inequivalence of the two sublattices. Specifically, for sufficiently weak anisotropy, the smaller spin at the center of the DW is found to become precisely normal to the easy-axis, selecting an arbitrary direction in the $xy$-plane and thereby breaking the U(1) spin-rotational symmetry spontaneously. This particular form of a FiM DW does not occur in antiferromagnetic systems and is shown to lead to a strong dependence of spin wave scattering pattern on the state of polarization of the spin wave, which can be either right-handed or left-handed, suggesting the utilization of such a narrow DW as a spin-wave filter. Moreover, we find that in the case of an atomically sharp DW, where all the spins point either up or down due to strong easy-axis anisotropy and therefore the polarization of the spin wave is conserved upon transmission, the wave

Author

Faridi, Ehsan; Vignale, Giovanni; Kim, Se Kwon

Published

2024

Language

EN