Dependence of Magneto-Impedance on Magnetic States in Manganeses Oxides

In this paper, the complex impedance spectroscopy (CIS) of La 0.67 Sr 1.33 MnO 4 and La 0.67 Sr 0.33 MnO 3 were applied to characterize the ac properties below and above Neel temperature and/or Curie temperature, respectively. We demonstrate that the CIS can be sensitively affected by magnetic state...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-11, Vol.44 (11), p.3962-3964
Main Authors: Lee, J.H., Chou, H., Hsu, H.S., Lin, C.P., Fu, C.M.
Format: Article
Language:English
Subjects:
Antiferromagnetic materials
Computational Intelligence Society
Cross-disciplinary physics: materials science
rheology
Dielectric relaxations
Dielectric thin films
Dielectrics and electrical insulation
Electrochemical impedance spectroscopy
equivalent circuit
Exact sciences and technology
impedance
Magnetic films
Magnetism
manganese oxides
Materials science
Other topics in materials science
Paramagnetic materials
Physics
Strontium
Temperature sensors
Thin film circuits
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Summary:In this paper, the complex impedance spectroscopy (CIS) of La 0.67 Sr 1.33 MnO 4 and La 0.67 Sr 0.33 MnO 3 were applied to characterize the ac properties below and above Neel temperature and/or Curie temperature, respectively. We demonstrate that the CIS can be sensitively affected by magnetic states on the manganite thin films. Our result provides further understanding of the dielectrics variation during the phase transition from an antiferromagnetic (AFM) insulating phase and/or a ferromagnetic metallic phase to a paramagnetic PM metallic phase. The CIS was analyzed based on an equivalent circuit model. The results imply that the specific feature of impedance can be attributed to the interplay of dielectric relaxations with the magnetic states at an alternative electromagnetic field.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2002860