The Physics of Magnetic Recording

ac bias recording ac field acicular particles alloy anhysteretic magnetization process applied field bias amplitude Chapter coating thickness cobalt coercive force coil component crystal anisotropy Curie point demagnetization losses demagnetizing field dependence described domain wall effects energy ferrite ferromagnetic field direction gap loss head gap length hysteresis loop increase interaction fields internal fields iron oxide irreversible kc/s layers linear long wavelength longitudinal magnetic material magnetic properties magnetic recording magnetic tape magnetization change magnetization characteristic maximum modified anhysteretic noise obtained occurs oriented particle switching fields permeability perpendicular perpendicular recording pole pole-pieces powders Preisach diagram print-through produce pulse recorded signal recorded tape recorded wavelength recording field recording head recording process recording zone reduced remanent magnetization reproducing head reproducing head core sample saturation magnetization short wavelengths shown in Fig signal field sinusoidal spontaneous magnetization superparamagnetic tape coating tape magnetization tape surface techniques temperature wavelength recording width zation zero