Programmable control of spin-wave transmission in a domain-wall spin valve

Abstract

Active manipulation of spin waves is essential for the development of magnon-based technologies. Here, we demonstrate programmable spin-wave filtering by resetting the spin structure of a pinned 90${}^{\circ }$ Néel domain wall in a continuous CoFeB film with abrupt rotations of uniaxial magnetic anisotropy. Using phase-resolved micro-focused Brillouin light scattering and micromagnetic simulations, we show that broad 90${}^{\circ }$ head-to-head or tail-to-tail magnetic domain walls are transparent to spin waves over a broad frequency range. In contrast, magnetic switching to a 90${}^{\circ }$ head-to-tail configuration produces much narrower domain walls at the same pinning locations. Spin waves are strongly reflected by a resonance mode in these magnetic domain walls. Based on these results, we propose a magnetic spin-wave valve with two parallel domain walls. Switching the spin-wave valve from an open to a close state changes the transmission of spin waves from nearly 100% to 0% at the resonance frequency. This active control over spin-wave transport could be utilized in magnonic logic devices or non-volatile memory elements.

arXiv comment9 pages, 5 figures

References in corpus (9)

• Realization of XNOR and NAND spin-wave logic gates
• Magnonic crystals for data processing
• All-magnonic spin-transfer torque and domain wall propagation
• Magnetic domain-wall motion by propagating spin waves
• Reprogrammable magnonic band structure of layered Permalloy/Cu/Permalloy nanowires
• Field Tuning of Ferromagnetic Domain Walls on Elastically Coupled Ferroelectric Domain Boundaries
• Size Dependence of Domain Pattern Transfer in Multiferroic Heterostructures
• Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures
• Experimental observation of the interaction of propagating spin waves with Néel domain walls in a Landau domain structure