Tuning magnonic devices with on-chip permanent micromagnets

• DOI: 10.48550/arxiv.2406.03206
• Publication Date: 2024-06-05
• Authors: Maria Cocconcelli; S. Tacchi; Róbert Erdélyi; Federico Maspero; Andrea Del Giacco; Alejandro E. Plaza; О. В. Коплак; Andréa Cattoni; Raffaele Silvani; M. Madami; Ádám Papp; György Csaba; Felix Kohl; Björn Heinz; Philipp Pirro; R. Bertacco
• Keywords: Brillouin light scattering BLS; spintronics, MEMS, micromagnets, spinwaves; magnonic devices; FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); spin waves

One of the most appealing features magnonics is easy tunability spin-waves propagation via external magnetic fields. Usually this requires bulky and power-hungry electromagnets which are not compatible with device miniaturization. Here we propose a different approach, exploiting stray field from permanent micromagnets integrated on same chip magnonic wave-guide. In our monolithic device, employ two SmCo square (10x10 $\mu$m$^2$) flanking CoFeB conduit at distances its axis, to produce tunable transverse bias between 7.5 3.0 mT in region magnets. Spin waves excited by an antenna just outside magnets enter variable higher (lower) effective when applied parallel (antiparallel) that micromagnets. Consequently, attenuation length phase shift Damon-Eshbach spin can be tuned wide range playing parallel-antiparallel configuration distance conduit. This work demonstrates potential micro-magnets for realization low-power, devices functionalities.