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dc.contributor.authorChang, Shu-Juien_US
dc.contributor.authorChuang, Pei-Yuen_US
dc.contributor.authorChong, Cheong-Weien_US
dc.contributor.authorChen, Yu-Jungen_US
dc.contributor.authorHuang, Jung-Chun Andrewen_US
dc.contributor.authorChen, Po-Wenen_US
dc.contributor.authorTseng, Yuan-Chiehen_US
dc.date.accessioned2018-08-21T05:53:20Z-
dc.date.available2018-08-21T05:53:20Z-
dc.date.issued2018-01-01en_US
dc.identifier.issn2046-2069en_US
dc.identifier.urihttp://dx.doi.org/10.1039/c8ra00068aen_US
dc.identifier.urihttp://hdl.handle.net/11536/144559-
dc.description.abstractThe introduction of ferromagnetism at the surface of a topological insulator (TI) produces fascinating spin-charge phenomena. It has been assumed that these fascinating effects are associated with a homogeneous ferromagnetic (FM) layer possessing a single type of magnetic phase. However, we obtained phase separation within the FM layer of a Ni80Fe20/Bi2Se3 heterostructure. This phase separation was caused by the diffusion of Ni into Bi2Se3, forming a ternary magnetic phase of Ni:Bi2Se3. The inward diffusion of Ni led to the formation of an FeSe phase outward, transforming the original Ni80Fe20/Bi2Se3 into a sandwich structure comprising FeSe/Ni:Bi2Se3/Bi2Se3 with dual-phase magnetic characteristics similar to that driven by the proximity effect. Such a phenomenon might have been overlooked in previous studies with a strong focus on the proximity effect. X-ray magnetic spectroscopy revealed that FeSe and Ni:Bi2Se3 possess horizontal and perpendicular magnetic anisotropy, respectively. The overall magnetic order of the heterostructure can be easily tuned by adjusting the thickness of the Bi2Se3 as it compromises the magnetic orders of the two magnetic phases. This discovery is essential to the quantification of spin-charge phenomena in similar material combinations where the FM layer is composed of multiple elements.en_US
dc.language.isoen_USen_US
dc.titleHeterostructured ferromagnet-topological insulator with dual-phase magnetic propertiesen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/c8ra00068aen_US
dc.identifier.journalRSC ADVANCESen_US
dc.citation.volume8en_US
dc.citation.spage7785en_US
dc.citation.epage7791en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000425647000053en_US
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