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Validity of values of thermal stability factor$mbi K_beta (=mbi K_ umbi V/kT)$and switching field$mbi H_ cro$in perpendicular recording medium obtained by Sharrock's formula has been analyzed using micromagnetic simulation. The following was found. Time-dependent remanent coercivity can be expressed by Sharrock's formula for media with the inter-grain exchange coupling$mbi w$in a wide range. The values...
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