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Nano Lett. 2018 Sep 12;18(9):5974-5980. doi: 10.1021/acs.nanolett.8b02806. Epub 2018 Aug 21.

Patterning-Induced Ferromagnetism of Fe3GeTe2 van der Waals Materials beyond Room Temperature.

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Department of Physics , University of California , Berkeley , California 94720 , United States.
Nano-Scale Science and Engineering Center (NSEC) , University of California , 3112 Etcheverry Hall , Berkeley , California 94720 , United States.
Department of Physics , University of California , Davis , California 95616 , United States.
Department of Physics , Georgetown University , Washington , D.C. 20057 , United States.
Rutgers Center for Emergent Materials and Department of Physics and Astronomy , Rutgers, The State University of New Jersey , Piscataway , New Jersey 08854 , United States.
Korea Research Institute of Standards and Science , Yuseong, Daejeon 305-340 , Republic of Korea.
International Center for Quantum Materials, School of Physics , Peking University , Beijing 100871 , China.


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.


Magnetic van der Waals material; room-temperature ferromagnetism; spin-reorientation transition; stripe-domain phase; vortex phase

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