Structure and magnetism in Fe-doped FeVSb and epitaxial Fe/FeVSb nanocomposite films
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| Format: | Preprint |
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2021
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| _version_ | 1866912769463287808 |
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| author | Shourov, Estiaque Zhang, Chenyu Voyles, Paul Kawasaki, Jason |
| author_facet | Shourov, Estiaque Zhang, Chenyu Voyles, Paul Kawasaki, Jason |
| contents | 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, consistent with Fe doping into FeVSb. Magnetotransport measurements suggest weak ferromagnetism that onsets at a temperature of $T_{c} \approx$ 5K. 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. Magnetotransport measurements suggest proximity-induced magnetism in the FeVSb, from the Fe/FeVSb interfaces, at an onset temperature of $T_{c} \approx$ 20K. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2106_13165 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Structure and magnetism in Fe-doped FeVSb and epitaxial Fe/FeVSb nanocomposite films Shourov, Estiaque Zhang, Chenyu Voyles, Paul Kawasaki, Jason Materials Science 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, consistent with Fe doping into FeVSb. Magnetotransport measurements suggest weak ferromagnetism that onsets at a temperature of $T_{c} \approx$ 5K. 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. Magnetotransport measurements suggest proximity-induced magnetism in the FeVSb, from the Fe/FeVSb interfaces, at an onset temperature of $T_{c} \approx$ 20K. |
| title | Structure and magnetism in Fe-doped FeVSb and epitaxial Fe/FeVSb nanocomposite films |
| topic | Materials Science |
| url | https://arxiv.org/abs/2106.13165 |