2018/05/09 by Sampo J. Hämäläinen, M. Madami, Hämäläinen, Sampo J. +7
Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #FOS: Physical sciences #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · pdf · doi:10.48550/arxiv.1805.03470
openalex publication_date 2018/05/09 · openalex created_date 2022/08/27 · openalex updated_date 2026/07/28
Active manipulation of spin waves is essential for the development of\nmagnon-based technologies. Here, we demonstrate programmable spin-wave\nfiltering by resetting the spin structure of a pinned 90^\∘ N 'eel\ndomain wall in a continuous CoFeB film with abrupt rotations of uniaxial\nmagnetic anisotropy. Using phase-resolved micro-focused Brillouin light\nscattering and micromagnetic simulations, we show that broad 90^\∘\nhead-to-head or tail-to-tail magnetic domain walls are transparent to spin\nwaves over a broad frequency range. In contrast, magnetic switching to a\n90^\∘ head-to-tail configuration produces much narrower domain walls at\nthe same pinning locations. Spin waves are strongly reflected by a resonance\nmode in these magnetic domain walls. Based on these results, we propose a\nmagnetic spin-wave valve with two parallel domain walls. Switching the\nspin-wave valve from an open to a close state changes the transmission of spin\nwaves from nearly 100% to 0% at the resonance frequency. This active control\nover spin-wave transport could be utilized in magnonic logic devices or\nnon-volatile memory elements.\n