Micromagnetic analysis of spin-valve heads with three-magnetic layers

摘要

A 3-dimensional micromagnetic model wasdeveloped in order to study spin-valve (SV) heads with syntheticferrimagnetic pinned layers (SF) and SV heads with biascompensation layers (BCL). All of these head have three-magnetic layers. The magnetization angle change #delta# #theta#in the free layer caused by the stray field from the medium wascalculated for each SV head. When the sensor height is greaterthan 0.4 #mu#m, #delta# #theta# for the SV head with BCL isover 20 percent larger than for the SV head with SF, owing to themagnetic saturation in the BCL. When the sensor heightdecreases, #delta# #theta# for the SV head with a BCL decreasesbecause the BCL is not saturated, while #delta# #theta# for theSV head with SF increases. The output efficiencies of the BCL-type head is almost the same as that of the SF-type head wheneach sensor height is adequate.