Controlled interconversion of quantized spin wave modes via local magnetic fields

Abstract

In the emerging field of magnonics, spin waves are considered for information processing and transmission at high frequencies. Towards this end, the manipulation of propagating spin waves in nanostructured waveguides for novel functionality has recently been attracting increasing focus of research. Excitations with uniform magnetic fields in such waveguides favors symmetric spin wave modes with odd quantization numbers. Interference between multiple odd spin wave modes leads to a periodic self-focusing effect of the propagating spin waves. Here we demonstrate, how antisymmetric spin wave modes with even quantization numbers can be induced by local magnetic fields in a well-controlled fashion. The resulting interference patterns are discussed within an analytical model and experimentally demonstrated using microfocused Brillouin light scattering (μ-BLS).

arXiv comment18 pages, 9 figures

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Cited by in corpus (7)

• Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
• Spin-Wave frequency division multiplexing in an yttrium iron garnet microstripe magnetized by inhomogeneous field
• Magnon confinement in an all-on-chip YIG cavity resonator using hybrid YIG/Py magnon barriers
• Imaging non-standing spin-waves in confined micron-sized ferromagnetic structures under uniform excitation
• Unidirectional propagation of spin waves excited by femtosecond laser pulses in a planar waveguide
• Parametric resonance of spin waves in ferromagnetic nanowires tuned by spin Hall torque
• Quantifying the spin-wave asymmetry in single and double rectangular Ni${}_{80}$Fe${}_{20}$ microstrips by TR-STXM, FMR and micromagnetic simulations