Epitaxial stabilization of ferromagnetism in the nanophase of FeGe |
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Authors: | Zeng Changgan Kent P R C Varela M Eisenbach M Stocks G M Torija Maria Shen Jian Weitering Hanno H |
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Institution: | Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA. |
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Abstract: | Epitaxial nanocrystals of FeGe have been stabilized on Ge(111). The nanocrystals assume a quasi-one-dimensional shape as they grow exclusively along the <110> direction of the Ge(111) substrate, culminating in a compressed monoclinic modification of FeGe. Whereas monoclinic FeGe is antiferromagnetic in the bulk, the nanowires are surprisingly strong ferromagnets below approximately 200 K with an average magnetic moment of 0.8 microB per Fe atom. Density functional calculations indicate an unusual stabilization mechanism for the observed ferromagnetism: lattice compression destabilizes the antiferromagnetic Peierls-like ground state observed in the bulk while increased p-d hybridization suppresses the magnetic moments and stabilizes ferromagnetism. |
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