Driving magnetization dynamics in an on-demand magnonic crystal by magneto-elastic interaction

Abstract

Using spatial light interference of ultrafast laser pulses, we generate a lateral modulation in the magnetization profile of an otherwise uniformly magnetized film, whose magnetic excitation spectrum is monitored via the coherent and resonant interaction with elastic waves. We find an unusual dependence of the magnetoelastic coupling as the externally applied magnetic field is angle- and field-tuned relative to the wave vector of the magnetization modulation, which can be explained by the emergence of spatially inhomogeneous spin-wave modes. In this regard, the spatial light interference methodology can be seen as a user-configurable, temporally windowed, on-demand magnonic crystal, potentially of arbitrary two-dimensional shape, which allows control and selectivity of the spatial distribution of spin waves. Calculations of spin waves using a variety of methods, demonstrated here using the plane-wave method and micromagnetic simulation, can identify the spatial distribution and associated energy scales of each excitation, which opens the door to a number of excitation methodologies beyond our chosen elastic wave excitation.

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Cited by in corpus (6)

• Magnetization Dynamics of Nanoscale Magnetic Materials: A Perspective
• Advances in coherent coupling between magnons and acoustic phonons
• Anatomy of ultrafast quantitative magneto-acoustics in freestanding nickel thin films
• Magnon-polaron formation in XXZ quantum Heisenberg chains
• Spin-wave localization on phasonic defects in one-dimensional magnonic quasicrystal
• The studies on phonons and magnons in (Ni80Fe20/Au/Co/Au) multilayers of different number of repetitions