Zero-field routing of spin waves in a multiferroic heterostructure
Zhu, Weijia (Aalto University School of Science. Department of Applied Physics)
Qin, Huajun (Aalto University School of Science. Department of Applied Physics)
Flajšman, Lukáš (Aalto University School of Science. Department of Applied Physics)
Taniyama, Tomoyasu (Nagoya University. Department of Physics)
Van Dijken, Sebastiaan (Aalto University School of Science. Department of Applied Physics)

Date:	2022
Abstract:	We report zero-field routing of spin waves in a multiferroic heterostructure comprising a ferromagnetic Fe film and a ferroelectric BaTiO3 substrate with fully correlated strain-coupled domains. In the Fe film, a regular alternation of magnetic anisotropy produces a back-and-forth rotation of uniform magnetization in zero magnetic field. Spin waves propagating across this domain structure are refracted at the magnetic domain walls because of abrupt changes in the dispersion relation and phase velocity. Using super-Nyquist sampling magneto-optical Kerr effect microscopy, we image the routing of spin waves and analyze the dependence of the effect on frequency and the propagation direction. We find that spin waves are routed efficiently by angles up to 60° without measurable loss in amplitude. The experimental results are reproduced by micromagnetic simulations and calculations based on the modified Snell's law for magnonics.
Grants:	European Commission 861145
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Dispersion phase ; Dispersion relations ; Domain structure ; Fe films ; Magnetic domain walls ; Multiferroic heterostructure ; Routings ; Super-Nyquist samplings ; Zero fields ; Zero magnetic fields
Published in:	Applied physics letters, Vol. 120, Issue 11 (March 2022) , art. 112407, ISSN 1077-3118

DOI: 10.1063/5.0086430

6 p, 2.3 MB

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