IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuP

Paper MI-TuP8
Temperature Dependence of Line Width of Ferromagnetic Resonance in Nickel-Zinc Ferrites

Tuesday, October 30, 2001, 5:30 pm, Room 134/135

Session: Emerging Materials & Nanostructures Poster Session
Presenter: S.C. Byeon, University of Alabama
Authors: S.C. Byeon, University of Alabama
C. Alexander, University of Alabama
H.B. Hong, Seoul National University, Korea
T.Y. Byun, Seoul National University, Korea
C.K. Kim, Hanyang University, Korea
K.S. Hong, Seoul National University, Korea
Correspondent: Click to Email
The systematic temperature dependence in line width of ferromagnetic resonance with the Fe content was observed at X band (9.78GHz) in (Ni@sub 0.5@Zn@sub 0.5@)@sub 1-x@Fe@sub 2+x@O@sub 4@ (-0.2@<=@x@<=@0.2). The line width of the stoichiometric composition (x = 0) showed minimum value, 50 Oe. In contrast, the line width of the non-stoichiometric compositions sharply increased to 210 Oe with increasing non-stoichiometry (x). The mechanism for this line width broadening was investigated using thermoelectric power and electrical resistivity, since the contribution of anisotropy and porosity to the line width was negligible in this compositional region. In Fe excess region, Fe@super 2+@ ion concentration increased with increasing Fe content, resulting in line width broadening due to relaxation. But, it was suggested that Ni@super 3+@ and Fe@super 2+@ ions coexist in Fe deficient region. Therefore the increase of line width in nickel-zinc ferrites originated from the Fe@super 2+@/Fe@super 3+@ magnetic relaxation in Fe excess region, and the Fe@super 2+@/Fe@super 3+@, Ni@super 2+@/Ni@super 3+@ magnetic relaxation in Fe deficient region.