Giant nonreciprocal emission of spin waves in Ta/Py bilayers

Jae Hyun Kwon, Jungbum Yoon, Praveen Deorani, Jong Min Lee, Jaivardhan Sinha, Kyung Jin Lee, Masamitsu Hayashi, Hyunsoo Yang

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applications because it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with out-of-plane magnetic fields. The nonreciprocity depends on the thickness of Ta underlayer, which is found to induce an interfacial anisotropy. The origin of observed high nonreciprocity is twofold: different polarities of the in-plane magnetization due to different angles of canted out-of-plane anisotropy and the spin pumping effect at the Ta/Py interface. Our findings provide an opportunity to engineer highly efficient, nonreciprocal spin wave–based applications, such as nonreciprocal microwave devices, magnonic logic gates, and information transports.

Original languageEnglish
Article numbere1501892
JournalScience Advances
Volume2
Issue number7
DOIs
Publication statusPublished - 2016

ASJC Scopus subject areas

  • General

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