Controlling Antiferromagnetic Magnon Polarization by Interfacial Exchange Interaction

Liu, Yawen; Liu, Haoyu; Yuan, Wei; Li, Yuhang; Li, Junxue; Shao, Qiming; Cheng, Ran; Shi, Jing

doi:10.1103/physrevapplied.18.034005

Controlling Antiferromagnetic Magnon Polarization by Interfacial Exchange Interaction

Journal Article · Fri Sep 02 00:00:00 EDT 2022 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.18.034005· OSTI ID:1979657

Liu, Yawen ^[1]; Liu, Haoyu ^[2]; ^[2]; Li, Yuhang ^[2]; ^[2]; ^[3]; ^[2]; ^[2]

Univ. of California, Riverside, CA (United States); OSTI
Univ. of California, Riverside, CA (United States)
Hong Kong University of Science and Technology (HKUST) (Hong Kong)

We demonstrate highly efficient control of antiferromagnetic (AFM) magnon spins by the interfacial exchange interaction in heterostructures of ferrimagnetic yttrium iron garnet (YIG) and AFM Cr₂O₃. At low temperatures, Cr₂O₃ is antiferromagnetically ordered. The interfacial exchange interaction exerted by YIG lifts the degeneracy between the AFM magnon modes in Cr₂O₃, resulting in a net spin polarization and a spin current dominated by left-handed magnons, even at zero magnetic field, which is detected by the spin Seebeck effect with a 5-nm-thick Pt film. In the AFM magnon-dominated region, even if the magnetic field is not sufficiently strong to induce the spin-flop transition in Cr₂O₃, the total spin Seebeck signal polarity flips when the YIG magnetization switches. It clearly indicates that the Cr₂O₃ magnon polarization is controlled by YIG magnetization through the interfacial exchange interaction. The demonstration of the efficient control of AFM magnon polarization opens a pathway to manipulate AFM magnon quantum states using FM-AFM heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46351; SC0012670

OSTI ID:: 1979657

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 3 Vol. 18; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
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Controlling Antiferromagnetic Magnon Polarization by Interfacial Exchange Interaction

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