Tuning the Curie temperature of a two-dimensional magnet/topological insulator heterostructure to above room temperature by epitaxial growth

Zhou, Wenyi; Bishop, Alexander J.; Zhang, Xiyue S.; Robinson, Katherine; Lyalin, Igor; Li, Ziling; Bailey-Crandell, Ryan; Cham, Thow Min Jerald; Cheng, Shuyu; Luo, Yunqiu Kelly; Ralph, Daniel C.; Muller, David A.; Kawakami, Roland K.

doi:10.1103/physrevmaterials.7.104004

Title: Tuning the Curie temperature of a two-dimensional magnet/topological insulator heterostructure to above room temperature by epitaxial growth

Journal Article · Mon Oct 23 00:00:00 EDT 2023 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.7.104004· OSTI ID:2203279

^[1]; Bishop, Alexander J. ^[1];

^[2]; Robinson, Katherine ^[1];

^[1]; Li, Ziling ^[1]; Bailey-Crandell, Ryan ^[1];

^[2];

^[1];

^[3]; Ralph, Daniel C. ^[2];

^[2];

^[1]

The Ohio State University, Columbus, OH (United States)
Cornell University, Ithaca, NY (United States)
Cornell University, Ithaca, NY (United States); University of Southern California, Los Angeles, CA (United States)

Heterostructures of two-dimensional (2D) van der Waals (vdW) magnets and topological insulators (TI) are of substantial interest as candidate materials for efficient spin-torque switching, quantum anomalous Hall effect, and chiral spin textures. However, since many of the vdW magnets have Curie temperatures below room temperature, we want to understand how materials can be modified to stabilize their magnetic ordering to higher temperatures. In this work, we utilize molecular beam epitaxy to systematically tune the Curie temperature (T_C) in thin film Fe₃GeTe₂/Bi₂Te₃ from bulklike values (~220 K) to above room temperature by increasing the growth temperature from 300°C to 375°C. For samples grown at 375°C, cross-sectional scanning transmission electron microscopy (STEM) reveals the spontaneous formation of different Fe_mGe_nTe₂ compositions (e.g., Fe₅Ge₂Te₂ and Fe₇Ge₆Te₂) as well as intercalation in the vdW gaps, which are possible origins of the enhanced Curie temperature. Furthermore, this observation paves the way for developing various Fe_mGe_nTe₂/TI heterostructures with novel properties.

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Research Organization:: The Ohio State University, Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0016379; DMR-1719875; NNCI-2025233

OSTI ID:: 2203279

Alternate ID(s):: OSTI ID: 2203303

Journal Information:: Physical Review Materials, Vol. 7, Issue 10; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Tuning the Curie temperature of a two-dimensional magnet/topological insulator heterostructure to above room temperature by epitaxial growth

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