Abstract
The edge wall, i.e., magnetization distribution near the edge of a permanent magnet with finite coercivity was studied to investigate the stability of shielded spin-valve heads. The edge wall is structured so that the self-demagnetization field inside the permanent magnet does not exceed the magnet's coercivity. 30 nm-thick CoCrPt with coercivity of 2000 Oe was sufficient to obtain a smooth transfer curve of the spin-valve head. However, if the coercivity of CoCrPt is reduced to 200 Oe or 100 Oe, a kink or Barkhausen jump will appear in the transfer curve.
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