Unidirectional propagation of zero-momentum magnons

2023/11/16 by Ondřej Wojewoda, Wojewoda, Ondřej, Jakub Holobrádek +17 · 3 citations
Physics and Astronomy · Engineering · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Magneto-Optical Properties and Applications

paper · pdf · doi:10.48550/arxiv.2311.10044

Abstract

We report on experimental observation of unidirectional propagation of zero-momentum magnons in synthetic antiferromagnet consisting of strained CoFeB/Ru/CoFeB trilayer. Inherent non-reciprocity of spin waves in synthetic antiferromagnets with uniaxial anisotropy results in smooth and monotonous dispersion relation around Gamma point, where the direction of the phase velocity is reversed, while the group velocity direction is conserved. The experimental observation of this phenomenon by intensity-, phase-, and time-resolved Brillouin light scattering microscopy is corroborated by analytical models and micromagnetic simulations.

Cited by

• Magnetic Materials for Quantum Magnonics
• Steady-state entanglement of spin qubits mediated by non-reciprocal and chiral magnons
• Chiral magnons for spin-qubit state transfer

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