Mode-sensitive magnetoelastic coupling in phononic-crystal magnomechanics

Abstract

Acoustically driven spin-wave resonance in a phononic crystal cavity is numerically investigated. The designed cavity enables confinement of gigahertz vibrations in a wavelength-scale point-defect structure and sustains a variety of resonance modes. Inhomogeneous strain distributions in the modes modify the magnetostrictive coupling and the spin-wave excitation susceptible to an external field orientation. In particular, a monopole-like mode in the cavity having a near-symmetrical pattern shows a subwavelength-scale mode volume and can provide a versatile acoustic excitation scheme independent on field-angle variation. Thus, the phononic-crystal platform offers an alternative approach to acoustically control the spin-wave dynamics with ultrasmall and inhomogeneous mode structures, which will be a key technology to integrate and operate large-scale magnomechanical circuits.

5 pages, 4 figures

References in corpus (5)

• Magnon Polarons in the Spin Seebeck Effect
• Design of Optomechanical Cavities and Waveguides on a Simultaneous Bandgap Phononic-Photonic Crystal Slab
• Surface acoustic wave driven ferromagnetic resonance in (Ga,Mn)(As,P) epilayers
• Phononic band structure engineering for high-Q gigahertz surface acoustic wave resonators on lithium niobate
• Design of GaAs-based valley phononic crystals with multiple complete phononic bandgaps at ultra-high frequency