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Condensed Matter > Materials Science
Title: Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface
(Submitted on 22 Feb 2024 (v1), last revised 22 Mar 2024 (this version, v2))
Abstract: We investigate the structural and electronic origin of antiferromagnetic coupling in the Yttrium iron garnet (YIG) and permalloy (Py) bilayer system at the atomic level. Ferromagnetic Resonance (FMR) reveal unique hybrid modes in samples prepared with surface ion milling, indicative of antiferromagnetic exchange coupling at the YIG/Py interface. Using scanning transmission electron microscopy (STEM), we highlight significant interfacial differences introduced by ion-milling. The observations suggests that the antiferromagnetic coupling in YIG/Py bilayers is predominantly driven by an oxygen-mediated super-exchange coupling mechanism on the tetrahedral Fe terminated YIG surface, which is supported by density functional theory (DFT) calculations. This research provides critical insight into the fundamental mechanisms governing the efficiency of coupling in magnetic bilayers and underscores the pivotal role of oxide surface termination in modulating magnetic interfacial dynamics.
Submission history
From: Jiangchao Qian [view email][v1] Thu, 22 Feb 2024 13:48:03 GMT (2313kb,D)
[v2] Fri, 22 Mar 2024 19:12:38 GMT (7650kb,D)
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