Abstract
The magnetic anisotropy fields (Hk=2K/M)and damping factors (α) of three kinds tapes of metal particle, oxide particle and metal-evaporated tapes for various home-use video systems were studied using 34-GHz ferromagnetic resonance (FMR). The Hk is in the 3-8 kOe range and varies linearly with the value of coercive force (Hc). The α value of metal-evaporated tape is the largest (0.24), indicating the small crystallite size. The smallest α is oxide particle tape (0.10), indicating well-aligned particles. Although the switching parameter Sw/Hc tends to increase with 1/α in general way, the relation of Sw/Hc vs. 1/α is different in particulate tape and thin-film tape in precisely.
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