Magnetization Process in Dilute Magnetic Oxides

Thin films of dilute magnetic oxides often exhibit high-temperature ferromagnetism with magnetization curves of the form M ¿ M s tanh (H/H 0 ); the curves are practically anhysteretic and temperature-independent below room temperature. The absence of temperature-dependent coercivity indicates that t...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2010-06, Vol.46 (6), p.2501-2503
Main Authors: Coey, J. M. D., Mlack, Jerome T., Venkatesan, M., Stamenov, P.
Format: Article
Language:English
Subjects:
Anisotropy
Ceramics
Coercive force
Cross-disciplinary physics: materials science
rheology
dilute magnetic oxides
Dilution
Exact sciences and technology
Ferromagnetism
Grain boundaries
Magnetic anisotropy
Magnetic dipoles
Magnetic films
Magnetic materials
Magnetism
Magnetization
Magnetization processes
Materials science
Nanoparticles
Other topics in materials science
Oxides
Paramagnetic materials
Perpendicular magnetic anisotropy
Physics
Quantitative analysis
Temperature
Thin films
Zinc oxide
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Summary:Thin films of dilute magnetic oxides often exhibit high-temperature ferromagnetism with magnetization curves of the form M ¿ M s tanh (H/H 0 ); the curves are practically anhysteretic and temperature-independent below room temperature. The absence of temperature-dependent coercivity indicates that the magnetization process is dominated by magnetic dipole interactions, not by magnetocrystalline anisotropy. In a model of ferromagnetic grain boundaries, H 0 ¿ 0.14M 0 , where M 0 is the magnetization of the ferromagnetic regions. Quantitative analysis of more than 200 films of different oxides reveals that only a few percent of the volume of these films is magnetically ordered.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2010.2041910