Room temperature ferromagnetism in pristine MgO thin films
2010 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, no 23Article in journal (Refereed) Published
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
IdentifiersURN: urn:nbn:se:kth:diva-13939DOI: 10.1063/1.3447376ISI: 000278695900048ScopusID: 2-s2.0-77953525394OAI: oai:DiVA.org:kth-13939DiVA: diva2:328494