マイクロ波アシスト磁気記録用発振素子の発振特性と渦電流の影響

概要

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Microwave-assisted magnetic recording (MAMR) has been proposed as one of the candidates to achieve a higher area1 recording density over 1.0 Tbit/inch2. MAMR needs a device to generate strong oscillating magnetic field to induce magnetic resonance in a recording medium. Its oscillating frequency is needed over 20 GHz, implying that eddy current might influence the dynamic magnetization behaviors of the field generating layer (FGL). In this paper, the influences of eddy current on the dynamic behaviors of the oscillator proposed by J-G. Zhu are discussed. The eddy current field in the FGL acts on the magnetizations to inhibit the rotation of precession, resulting in a slight increase in the oscillating frequency. However, the strength of the eddy current field is very small less than 20 A/m. Thus, it is concluded that eddy current field little influences the dynamic behaviors of the FGL.
2009-07-01