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Room temperature ferromagnetism in pristine MgO thin films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
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2010 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, no 23, 232505- p.Article in journal (Refereed) Published
Abstract [en]

Robust ferromagnetic ordering at, and well above room temperature is observed in pure transparent MgO thin films (<170 nm thick) deposited by three different techniques. Careful study of the wide scan x-ray photoelectron spectroscopy rule out the possible presence of any magnetic contaminants. In the magnetron sputtered films, we observe magnetic phase transitions as a function of film thickness. The maximum saturation magnetization of 5.7 emu/cm(3) is measured on a 170 nm thick film. The films above 500 nm are found to be diamagnetic. Ab initio calculations suggest that the ferromagnetism is mediated by cation vacancies.

Place, publisher, year, edition, pages
2010. Vol. 96, no 23, 232505- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-136056DOI: 10.1063/1.3447376ISI: 000278695900048OAI: oai:DiVA.org:uu-136056DiVA: diva2:376119
Available from: 2010-12-10 Created: 2010-12-09 Last updated: 2017-12-11Bibliographically approved

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Johansson, BörjeAhuja, Rajeev

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