Unconventional interlayer exchange coupling via chiral phonons in synthetic magnetic oxide heterostructures

Jeong, Seung Gyo; Kim, Jiwoong; Seo, Ambrose; Park, Sungkyun; Jeong, Hu Young; Kim, Young-Min; Lauter, Valeria; Egami, Takeshi; Han, Jung Hoon; Choi, Woo Seok

doi:10.1126/sciadv.abm4005

Title: Unconventional interlayer exchange coupling via chiral phonons in synthetic magnetic oxide heterostructures

Journal Article · Fri Jan 28 00:00:00 EST 2022 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abm4005· OSTI ID:1883676

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Sungkyunkwan University, Suwon (Republic of Korea)
Pusan National University, Busan (Korea, Republic of)
University of Kentucky, Lexington, KY (United States)
Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)

Chiral symmetry breaking of phonons plays an essential role in emergent quantum phenomena owing to its strong coupling to spin degree of freedom. However, direct experimental evidence of the chiral phonon–spin coupling is lacking. In this study, we report a chiral phonon–mediated interlayer exchange interaction in atomically controlled ferromagnetic metal (SrRuO₃)-nonmagnetic insulator (SrTiO₃) heterostructures. Owing to the unconventional interlayer exchange interaction, we have observed rotation of spins as a function of nonmagnetic insulating spacer thickness, resulting in a spin spiral state. The chiral phonon–spin coupling is further confirmed by phonon Zeeman effect. The existence of the chiral phonons and their interplay with spins along with our atomic-scale heterostructure approach unveil the crucial roles of chiral phonons in magnetic materials.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF); National Science Foundation (NSF); Alexander von Humboldt Foundation; Ministry of Education and National Research Foundation of Korea

Grant/Contract Number:: AC05-00OR22725; NRF-2021R1A2C2011340; NRF-2020K1A3A7A09077715; NRF-2020R1A2C1006207; DMR-1454200; DMR-2104296

OSTI ID:: 1883676

Journal Information:: Science Advances, Vol. 8, Issue 4; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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