Abstract
The coercivity mechanism of multilayer (Co/Pt) and (Co/Pd) is discussed based on the phenomenological micromagnetic theory and the magnetic relaxation treatment. Based on the micromagnetic theory, the pinning size of the order of a few /spl Aring/ is found for both (Co/Pt) and (Co/Pd), but about 100 /spl Aring/ for an amorphous TbFeCo film. On the other hand, the magnetic relaxation approach estimates the Barkhausen volume of the order of 10/sup -18/cm/sup 3/ for these multilayers.
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