期刊
NANO LETTERS
卷 18, 期 9, 页码 5974-5980出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02806
关键词
Magnetic van der Waals material; stripe-domain phase; vortex phase; spin-reorientation transition; room-temperature ferromagnetism
类别
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231, KCWF16]
- National Science Foundation [DMR-1504568, DMR-1610060]
- UC Office of the President Multicampus Research Programs and Initiatives [MRP-17-454963]
- Future Materials Discovery Program through the National Research Foundation of Korea [2015M3D1A1070467]
- Science Research Center Program through the National Research Foundation of Korea [2015R1A5A1009962]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4413]
Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications, especially after the recent discovery of intrinsic ferromagnetism in monolayer vdW materials. There has been a critical need for tunable ferromagnetic vdW materials beyond room temperature. Here, we report a real-space imaging study of itinerant ferromagnet Fe3GeTe2 and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in Fe3GeTe2 is characterized by an unconventional out-of-plane stripe-domain phase. In Fe3GeTe2 microstructures patterned by a focused ion beam, the out-of-plane stripe domain phase undergoes a surprising transition at 230 K to an in-plane vortex phase that persists beyond room temperature. The discovery of tunable ferromagnetism in Fe3GeTe2 materials opens up vast opportunities for utilizing vdW magnets in room-temperature spintronics devices.
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