Abstract
An NiFe (200Å)/Cu (200Å)/NiFe (50Å) trilayer film of submicron width was prepared, and the noncoupled-type giant magnetoresistance (GMR) effect was investigated. Magnetization reversal in a single submicron-sized magnetic wire was sensitively detected through a sudden jump in resistance due to antiparallel alignment of two NiFe layers. It was demonstrated that an artificially introduced neck in the wire acts as an obstacle to magnetic domain wall propagation.
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