Thickness-Tunable Growth of Composition-Controllable Two-Dimensional Fe<sub><i>x</i></sub>GeTe<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 36383484.
- Also identified by DOI 10.1021/acs.nanolett.2c03562.
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Abstract
Two-dimensional (2D) magnetic materials provide an ideal platform for investigating novel magnetism and spin behavior in low-dimensional systems while being restricted by the deficiency of accurate bottom-up synthesis. To overcome this difficulty, a facile and universal flux-assisted growth (FAG) method is proposed to synthesize the multicomponent Fe<sub><i>x</i></sub>GeTe<sub>2</sub> (<i>x</i> = 3-5) with different Fe contents and even alloyed with hetero metal atoms. This one-to-one method ensures the stoichiometry consistency from the Fe<sub><i>x</i></sub>GeTe<sub>2</sub> and M<sub><i>y</i></sub>Fe<sub>5-<i>y</i></sub>GeTe<sub>2</sub> (M = Co, Ni) bulk crystal precursors to the 2D nanosheets, with controllable composition. Tuning the growth temperatures can provide thickness-tunable products. Changeable magnetic properties of Fe<sub><i>x</i></sub>GeTe<sub>2</sub> and alloyed Co<sub><i>y</i></sub>Fe<sub>5-<i>y</i></sub>GeTe<sub>2</sub> are substantiated by the superconducting quantum interference device and reflective magnetic circular dichroism. This method generates thickness-tunable high-crystallinity Fe<sub><i>x</i></sub>GeTe<sub>2</sub> samples without phase separation and exhibits a high tolerance to different substrates and a large temperature window, providing a new avenue to synthesize and explore such multicomponent 2D magnets and even the alloyed ones.