Femtosecond laser pulse driven caustic spin wave beams

Abstract

Controlling the directionality of spin waves is a key ingredient in wave-based computing methods such as magnonics. In this paper, we demonstrate this particular aspect by using an all-optical point-like source of continuous spin waves based on frequency comb rapid demagnetization. The emitted spin waves contain a range of k-vectors and by detuning the applied magnetic field slightly off the ferromagnetic resonance (FMR), we observe X-shaped caustic spin-wave patterns at $70^{\circ }$ propagation angles as predicted by theory. When the harmonic of the light source approaches theFMR, the caustic pattern gives way to uniaxial spin-wave propagation perpendicular to the in-plane component of the applied field. This field-controlled propagation pattern and directionality of optically emitted short-wavelength spin waves provide additional degrees of freedom when designing magnonic devices.

arXiv comment5 pages, 4 figures

References in corpus (12)

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• Radiation of caustic beams from a collapsing bullet
• Sustained coherent spin wave emission using frequency combs

Cited by in corpus (9)

• Magnonic frequency comb through nonlinear magnon-skyrmion scattering
• Tutorial: Nonlinear magnonics
• Dispersionless propagation of ultra-short spin-wave pulses in ultrathin yttrium iron garnet waveguides
• Caustic spin wave beams in soft, thin films: properties and classification
• Unidirectional propagation of spin waves excited by femtosecond laser pulses in a planar waveguide
• Spin-Wave Self-Imaging: Experimental and Numerical Demonstration of Caustic and Talbot-like Diffraction Patterns
• Néel domain wall as a tunable filter for optically excited magnetostatic waves
• Femtosecond laser comb driven perpendicular standing spin waves
• Shaping non-reciprocal caustic spin-wave beams