Exchange bias in LaFeO3 nanoparticles

Nanoparticles of antiferromagnetic LaFeO3 were prepared by the sol--gel method. An exchange bias effect has been observed and is attributed to the exchange coupling between the ferromagnetic shell and antiferromagnetic core of the particles. The results provide clear evidence of the presence of spon...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2010-06, Vol.43 (24), p.245002-245002
Main Authors: Ahmadvand, Hossein, Salamati, Hadi, Kameli, Parviz, Poddar, Asok, Acet, Mehmet, Zakeri, Khalil
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bias
Coercive force
Coercivity
Ferromagnetism
Nanoparticles
Shells
Spontaneous
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Summary:Nanoparticles of antiferromagnetic LaFeO3 were prepared by the sol--gel method. An exchange bias effect has been observed and is attributed to the exchange coupling between the ferromagnetic shell and antiferromagnetic core of the particles. The results provide clear evidence of the presence of spontaneous exchange bias in this system. After field cooling from room temperature, the exchange bias increases while the coercivity decreases with decreasing temperature. Taking into account the role of thermal activation, the temperature dependence of exchange bias and coercivity has been interpreted in terms of the spontaneous exchange bias mechanism proposed recently.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/43/24/245002