Interface structure and fabrication process of FePd/2D material heterojunctions
POSTER
Abstract
The FePd alloy with L10-ordered structure exhibits a large magnetic anisotropy and low damping, making it a promising candidate for next-generation spintronics applications. Recent experimental advancements have enabled the synthesis of a van der Waals heterointerface between FePd and graphene.
In our work, we have performed first-principles electron structure and spin-transport calculations, revealing that the surface atomic structure and magnetoresistance ratio, which reaches 100% to 300% in the FePd/Gr/FePd heterojunction.
We further theoretically demonstrate that oxygen-induced segregation of Fe at the FePd/graphene boundary is crucial for stabilizing this well-defined interface, a conclusion supported by complementary X-ray photoelectron spectroscopy. In addition, we have extended our investigation to the interfaces of various other 2D materials, including PdSe2 and WS2. These findings provide a unified understanding of interfacial chemistry and spin transport in FePd/2D‑material heterostructures.
In our work, we have performed first-principles electron structure and spin-transport calculations, revealing that the surface atomic structure and magnetoresistance ratio, which reaches 100% to 300% in the FePd/Gr/FePd heterojunction.
We further theoretically demonstrate that oxygen-induced segregation of Fe at the FePd/graphene boundary is crucial for stabilizing this well-defined interface, a conclusion supported by complementary X-ray photoelectron spectroscopy. In addition, we have extended our investigation to the interfaces of various other 2D materials, including PdSe2 and WS2. These findings provide a unified understanding of interfacial chemistry and spin transport in FePd/2D‑material heterostructures.
*This study is partly supported by the Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (No. JPJSCCA20230005), by Cooperative Research Project from CSRN, and by the cross-appointment project (H.N, P.S., and J.R.) and QST-Tohoku University matching foundation. In addition, this work is also partially financially supported by MEXT as part of the "Program for Promoting Researches on the Supercomputer Fugaku" (Quantum-Theory-Based Multiscale Simulations toward the Development of Next-Generation Energy-Saving Semiconductor Devices, JPMXP1020200205), JSPS KAKENHI (JP22H05463), JST CREST(JPMJCR22B4), Kurata Grants, and the Iwatani Naoji Foundation.
Publication: arXiv:2502.00328
Presenters
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Mitsuharu Uemoto
- Kobe University