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Indexed by:期刊论文

Date of Publication:2010-06-07

Journal:APPLIED PHYSICS LETTERS

Included Journals:SCIE、EI

Volume:96

Issue:23

ISSN No.:0003-6951

Abstract: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. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3447376]