Patterning-Induced Ferromagnetism of Fe<sub>3</sub>GeTe<sub>2</sub> van der Waals Materials beyond Room Temperature.
basic_science · Level V
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- Record sourced from PubMed, PMID 30114354.
- Also identified by DOI 10.1021/acs.nanolett.8b02806.
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Abstract
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 Fe<sub>3</sub>GeTe<sub>2</sub> and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in Fe<sub>3</sub>GeTe<sub>2</sub> is characterized by an unconventional out-of-plane stripe-domain phase. In Fe<sub>3</sub>GeTe<sub>2</sub> 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 Fe<sub>3</sub>GeTe<sub>2</sub> materials opens up vast opportunities for utilizing vdW magnets in room-temperature spintronics devices.