Room temperature ferromagnetism in pristine MgO thin films

Araujo, C. Moyses; Kapilashrami, Mukes; Xu Jun; Jayakumar, O. D.; Nagar, Sandeep; Yan Wu; Århammar, Cecilia; Johansson, Börje; Belova, Lyubov; Ahuja, Rajeev; Gehring, Gillian A.; Rao, K. V.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232505
Academic Journal
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/cm3 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.


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