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Long-range magnetic interaction in Mn\(_{x}\)Ge\(_{1-x}\): structural, spectromicroscopic and magnetic investigations

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Abstract

We report the structural, electronic and magnetic investigation using extended X-ray absorption fine structure spectroscopy (EXAFS), photoelectron microscopy, spin-resolved photoemission and magneto-optical Kerr effect on the properties of Mn\(_{x}\)Ge\(_{1-x}\) systems obtained by molecular beam epitaxy deposition of manganese on Ge(001) wafers annealed on temperatures between 50 and 450 \(^{\circ }\)C. Magnetic ordering can be achieved when the substrate temperature is higher than 250 \(^{\circ }\)C, when the manganese tends to diffuse into the Ge matrix and segregate in Mn\(_{5}\)Ge\(_{3}\)-like compounds, as proved by EXAFS. High spatial resolution photoelectron spectroscopy reveals Mn inhomogeneities in the 5–10 \(\upmu \)m range, even though Mn is found mostly in the same chemical state all over the surface.

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Acknowledgements

This work has been funded by the Romanian Research Authority through the Core Program 2016-2017, Contract No. PN16-480101 and by the UEFSCDI Agency through the Project PN2-152/2012. Access to th Elettra synchrotron radiation facility was provided by the CERIC Project 20142030.

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Authors and Affiliations

  1. National Institute of Materials Physics, Atomiştilor 405A, 077125, Măgurele-Ilfov, Romania

    Liviu Cristian Tănase, George-Adrian Lungu, Laura Elena Abramiuc, Ioana Cristina Bucur, Nicoleta Georgiana Apostol, Ruxandra Maria Costescu, Cristian-Alexandru Tache, Dan Macovei & Cristian-Mihail Teodorescu

  2. Elettra Sincrotrone Trieste, SS 14, Km 163.5 Area Sci Pk, 34149, Trieste, Italy

    Alexey Barinov

  3. Faculty of Physics, University of Bucharest, Atomiştilor 405, 077125, Măgurele-Ilfov, Romania

    Liviu Cristian Tănase, Laura Elena Abramiuc & Ioana Cristina Bucur

  4. Department of Physics, University of Trieste, Alfonso Valerio 2, 34127, Trieste, Italy

    Cristian-Alexandru Tache

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  1. Liviu Cristian Tănase
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  2. George-Adrian Lungu
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Tănase, L.C., Lungu, GA., Abramiuc, L.E. et al. Long-range magnetic interaction in Mn\(_{x}\)Ge\(_{1-x}\): structural, spectromicroscopic and magnetic investigations. J Mater Sci 52, 3309–3320 (2017). https://doi.org/10.1007/s10853-016-0618-9

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