鉄基強磁性酸化物スパッタ薄膜における磁界による誘電率変化

概要

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The variation of the dielectric permittivity ε_r against magnetic field H in Fe_2O_3-Bi_2O_3-PbTiO_3 system thin films prepared by rf-reactive puttering was investigated. ε'_r, the real part of ε_r, changed with H. Its maximum relative change of ε'_r, i.e. |Δε'_r/ε'_r |_<max> reached values as large as 0.12% in a wide frequency range from 1 Hz to 100 kHz, whereas its imaginary part ε"_r did not change. Δε'_r vs. H curve showed hysteresis loop, which was found to be a strongly correlated phenomenon with the differential magnetic permeability dM/dH. Same experiments were also carried out for Cu-substituted Fe_2O_3-Bi_2O_3-PbTiO_3 films. A small amount of Cu-substitution resulted in magnetic softening, and the decrease of |Δε'_r/ε'_r |_<max> as well.
社団法人日本磁気学会の論文
2001-04-15