Microwave Resonance and Relaxation of Excess-Iron Manganese Ferrites

概要

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FMR measurements at 9.3 GHz have been made on single crystal disks of manganese ferrites with resistivities of the order of 0.1 Ωcm (300 K), for various values of thickness. Comparison of the data with calculated absorption formulae indicates that an appreciable influence of skin depth effect remains until the thickness becomes as small as about 40 μm. This means that spherical samples are unsuitable for the examination of intrinsic relaxation mechanism in excess-iron ferrites. For samples with thickness of 15∼22 μm. the temperature dependence of linewidth does not exhibit a peak in a temperature region from 77 to 300 K, quite different from that for spherical samples, but shows a gradual increase below ∼ 150 K which can be described in terms of the slow relaxation mechanism.
社団法人日本物理学会の論文
1973-09-05