[14p-K303-1~13] 10.2 Fundamental and exploratory device technologies for spin

2:15 PM - 2:30 PM JST(5:15 AM - 5:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[14p-K303-4] Nonreciprocity of Spin Wave with Small Wavenumber in Ferromagnetic Bilayer

〇(B)Shion Yoshimura¹, Kento Yasui¹, Shugo Yoshii¹, Ryo Ohshima¹, Masashi Shiraishi¹ (1.Kyoto Univ.)

Keywords:

spin wave,nonreciprocity,ferromagnetic bilayer

Spin wave nonreciprocity is essential for achieving unidirectional propagation. A ferromagnetic bilayer, composed of two ferromagnets with different saturation magnetizations, exhibits considerably large frequency nonreciprocity despite its simple structure. However, achieving significant nonreciprocity so far requires a large wavenumber, at which the group velocity tends to decrease. In this study, we demonstrate theoretically and experimentally that strong nonreciprocity is realized at a small wavenumber by changing the thickness of the bilayer and modulating the wavenumber at which spin wave modes couple.