Patent ID: 6144524
Filing Date: 2000-11-07
Classification: B82Y,G01R,G11B,H01F,H01L

Abstract:
A spin valve magnetoresistance device comprising:a free magnetic layer;a pinned magnetic layer;a non-magnetic layer disposed between said free magnetic layer and said pinned magnetic layer; anda permanent magnet film defining a non-zero track width x (in .mu.m) configured to control magnetic domains of said free magnetic layer;wherein a product of a residual magnetization (in .mu.emu/cm.sup.3) of said permanent magnet film times a thickness (in cm) of said permanent magnet film is given by f(x):f(x)=-11.24(1/x.sup.2)+A,where x.ltoreq.2 .mu.m, and 670 .mu.emu/cm.sup.2 .ltoreq.A.ltoreq.900 .mu.emu/cm.sup.2.