Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2010-09-01

Journal: JOURNAL OF PHYSICS-CONDENSED MATTER

Included Journals: EI、SCIE

Volume: 22

Issue: 34

ISSN: 0953-8984

Abstract: Ferromagnetic ordering at room temperature (RTFM) in MgO thin films deposited by RF magnetron sputtering under various atmospheric conditions and temperatures is reported. A saturation magnetization (MS) value as high as 1.58 emu g(-1) is (0.046 mu B/unit cell) observed for a 170 nm film deposited at RT under an oxygen pressure of 1.3 x 10(-4) mbar. In contrast, films deposited at elevated temperature (under an identical oxygen pressure), or at higher oxygen pressures, as well as under a nitrogen atmosphere at RT show significantly suppressed magnetization. The ferromagnetic order in the MgO matrix is believed to be defect induced.