Ferromagnetism in pseudocubic BaFeO3 epitaxial films

被引：34

作者：

Callender, C. ^{[1
]}

Norton, D. P. ^{[1
]}

Das, R. ^{[3
]}

Hebard, A. F. ^{[3
]}

Budai, J. D. ^{[2
]}

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[3] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2832768

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Growth and properties of epitaxial BaFeO3 thin films in the metastable cubic perovskite phase are examined. BaFeO3 films were grown on (012) LaAlO3 and (001) SrTiO3 single crystal substrates by pulsed-laser deposition. X-ray diffraction shows that films grown between 650 and 850 degrees C yield an oxygen-deficient BaFeO2.5+x pseudocubic perovskite phase that decreases in lattice spacing with increasing growth temperature. Magnetization measurements on as-deposited BaFeO3 films indicate weakly ferromagnetic behavior. Annealing in 1 atm oxygen ambient converts them into conductive and robustly ferromagnetic pseudocubic BaFeO3 phase with T-C=235 K. Observation of ferromagnetism with increasing oxygen content is consistent with superexchange coupling of Fe+4-O-Fe+4. (c) 2008 American Institute of Physics.

引用

页数：3

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