Title :
Dependence of Magneto-Impedance on Magnetic States in Manganeses Oxides
Author :
Lee, J.H. ; Chou, Hsiung ; Hsu, H.S. ; Lin, C.P. ; Fu, C.M.
Author_Institution :
Dept. of Phys., Nat. Sun Yat-sen Univ., Kaohsiung
Abstract :
In this paper, the complex impedance spectroscopy (CIS) of La0.67Sr1.33MnO4 and La0.67Sr0.33MnO3 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.
Keywords :
Curie temperature; Neel temperature; dielectric relaxation; ferromagnetic-antiferromagnetic transitions; lanthanum compounds; magnetic thin films; magnetoresistance; paramagnetic-antiferromagnetic transitions; strontium compounds; AC properties; CIS; Curie temperature; La0.67Sr0.33MnO3; La0.67Sr1.33MnO4; Neel temperature; antiferromagnetic insulating phase; complex impedance spectroscopy; dielectric relaxations; electromagnetic field; equivalent circuit model; ferromagnetic metallic phase; magnetic states; magnetoimpedance; manganeses oxides; manganite thin films; paramagnetic metallic phase; phase transition; Dielectric relaxations; equivalent circuit; impedance; manganese oxides;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2008.2002860
