تقرير
Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface
| العنوان: | Unraveling the origin of antiferromagnetic coupling at YIG/permalloy interface |
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| المؤلفون: | Qian, Jiangchao, Li, Yi, Jiang, Zhihao, Busch, Robert, Ni, Hsu-Chih, Lo, Tzu-Hsiang, Hoffmann, Axel, Schleife, André, Zuo, Jian-Min |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Quantum Physics |
| الوصف: | We investigate the structural and electronic origin of antiferromagnetic (AFM) 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 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. The STEM measurements suggest that the interfacial AFM coupling is predominantly driven by an oxygen-mediated super-exchange 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 magnetic coupling in a YIG/ferromagnet heterostructure, and prove that the interfacial structure can be experimentally tuned by surface ion-milling. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2402.14553 |
| رقم الأكسشن: | edsarx.2402.14553 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |