Nonreciprocal surface magnetoelastic dynamics

Abstract

Motivated by recent experiments, we investigate the nonreciprocal magnetoelastic interaction between the surface acoustic phonons of dielectric non-magnetic substrates and magnons of proximity nanomagnets. The magnetization dynamics exerts rotating forces at the edges of the nanomagnet that causes the nonreciprocal interaction with surface phonons due to its rotation-momentum locking. This coupling induces the nonreciprocity of the surface phonon transmission and a nearly complete phonon diode effect by several (tens of) magnetic nanowires of high (ordinary) magnetic quality. Phase-sensitive microwave transmission is also nonreciprocal that can pick up clear signals of the coherent phonons excited by magnetization dynamics. Nonreciprocal pumping of phonons by precessing magnetization is predicted using Landauer-Büttiker formalism.

13 pages, 7 figures, to appear in Phys. Rev. B

References in corpus (9)

• Phase reciprocity of spin-wave excitation by a microstrip antenna
• Magnetization oscillations and waves driven by pure spin currents
• Acoustic ferromagnetic resonance and spin pumping induced by surface acoustic waves
• Chiral excitation of spin waves in ferromagnetic films
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• Circulating cavity magnon polaritons
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• Negative Gilbert damping in cavity optomagnonics

Cited by in corpus (5)

• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Acoustic Frequency Multiplication and Pure Second Harmonic Generation of Phonons by Magnetic Transducers
• Nonlocal nonreciprocal optomechanical circulator
• On the instabilities of intrinsic thermoacoustic modes in a thermoacoustic waveguide with anechoic terminations