Abstract
The validity of the coherent rotations mechanism of reversal in CoCrPtB longitudinal hard disk media is probed. The proposed method is based on a comparison between the K2/K1 ratios (K1 and K2 being the first and second order anisotropy constants) measured by a hard axis loop method, and that estimated using in-plane isothermal remanent magnetization and dc-demagnetization processes in the hypothesis of coherent reversal. The disagreement between the two values of K2/K1, noticed for all the investigated samples, indicates an incoherent reversal mechanism. The origin of this mechanism is believed to be the grain coupling. The high values of the switching field at π/2 angle between the applied field and the easy axis HSW(ψ=π/2), measured by hard axis loop, can be larger than the writing field. This may explain the experimentally noticed degradation of signal/noise ratio with increasing HSW(ψ=π/2).
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