Ferromagnetic Resornance in Metal Audio Tapes

概要

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Ferromagnetic resonance measurements at 34 GHz were carried out to study the magnetic anisotropy field of the acicular Fe particles in commercially available particulate metal tapes for audio recording. The value of the average anisotropy field (H_a) due to the acicular shape of the oriented particles has been determined to be 7.57kOe, assuming the saturation magnetization (4πM) of 17.2 kG, 80% of bulk Fe. Using the obtained H_a. value, the axial ratio of the acicular particles is deduced as 4.8. The linewidth of 5 kOe along the tape length direction is fourtimes as large as that of video Co-γ-Fe_2O_3 tapes, which is due to a large distribution of the Fe particle axis and/orpores in the particles.
社団法人応用物理学会の論文
1994-12-15