Structure and magnetism in epitaxial Fe1+xVSb nanocomposite films

Shourov, Estiaque H.; Zhang, Chenyu; Voyles, Paul M.; Kawasaki, Jason K.

doi:10.1103/physrevmaterials.5.124605

Title: Structure and magnetism in epitaxial Fe 1 + x VSb nanocomposite films

Journal Article · Thu Dec 23 00:00:00 EST 2021 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.5.124605· OSTI ID:1980339

^[1]; Zhang, Chenyu ^[1];

^[1];

^[1]

Univ. of Wisconsin, Madison, WI (United States)

The combination of ferromagnetism and semiconducting behavior offers an avenue for realizing novel spintronics and spin-enhanced thermoelectrics. Here we demonstrate the synthesis of doped and nanocomposite half-Heusler Fe_1+x VSb films by molecular beam epitaxy. For dilute excess Fe (x < 0.1), we observe a decrease in the Hall electron concentration and no secondary phases in x-ray diffraction. Magnetotransport measurements suggest weak ferromagnetism that onsets at a temperature of T_c ≈ 5 K. For higher Fe content (x > 0.1), ferromagnetic Fe nanostructures precipitate from the semiconducting FeVSb matrix. The Fe/FeVSb interfaces are epitaxial, as observed by transmission electron microscopy and x-ray diffraction. Further, magnetotransport measurements suggest proximity-induced magnetism in the FeVSb from the Fe/FeVSb interfaces, or superparamagnetically coupled Fe-rich clusters, at an onset temperature of T_c ≈ 20 K.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: FG02-08ER46547; DMR-1752797; DMR-1720415

OSTI ID:: 1980339

Journal Information:: Physical Review Materials, Vol. 5, Issue 12; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Structure and magnetism in epitaxial Fe 1 + x VSb nanocomposite films

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