Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface

Qian, Jiangchao; Li, Yi; Jiang, Zhihao; Busch, Robert; Ni, Hsu-Chih; Lo, Tzu-Hsiang; Hoffmann, Axel; Schleife, André; Zuo, Jian-Min

doi:10.1103/physrevmaterials.8.104405

Title: Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface

Journal Article · 11 October 2024 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.8.104405 · OSTI ID:2466122

^[1]; Li, Yi ^[2];

^[3];

^[3]

University of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
Argonne National Laboratory (ANL), Argonne, IL (United States)
University of Illinois at Urbana-Champaign, IL (United States)

We investigate the structural and electronic origin of antiferromagnetic (AFM) coupling in the yttrium iron garnet (YIG) and permalloy (Ni₈₀⁢Fe₂₀, Py) bilayer system at the atomic level. Ferromagnetic resonance (FMR) spectra reveal unique hybrid modes in samples prepared with surface ion milling, indicative of antiferromagnetic exchange coupling at the YIG/Py interface. Using atomic resolution scanning transmission electron microscopy (STEM), we found that AFM coupling appears at the YIG/Py interface of the tetrahedral YIG surface formed with ion milling. Here, the STEM measurements suggest that the interfacial AFM coupling is predominantly driven by an oxygen-mediated superexchange coupling mechanism, which is confirmed by the density-functional theory (DFT) calculations to be energetically favorable. Thus, the combined experimental and theoretical results reveal the critical role of interfacial atomic structure in determining the type of magnetic coupling in a YIG/ferromagnet heterostructure, and prove that the interfacial structure can be experimentally tuned by surface ion milling.

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Research Organization:: University of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0022060

OSTI ID:: 2466122

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 10 Vol. 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface

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