Title :
Effect of permanent magnet coercivity on transfer curve of shielded spin-valve head
Author :
Hashimoto, Minoru ; Kitamura, Kenichi ; Miyauchi, Teiichi
Author_Institution :
Res. Center, Sony Corp., Yokohama, Japan
fDate :
9/1/1999 12:00:00 AM
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
Keywords :
Barkhausen effect; chromium alloys; cobalt alloys; coercive force; demagnetisation; magnetic domains; magnetic heads; magnetic shielding; magnetisation; permanent magnets; platinum alloys; spin valves; Barkhausen jump; CoCrPt; coercivity; domain stability; edge wall; magnetization distribution; permanent magnet; self-demagnetization field; shielded spin-valve head; transfer curve; Coercive force; Couplings; Magnetic domains; Magnetic heads; Magnetic shielding; Magnetic susceptibility; Magnetization; Permanent magnets; Shape; Stability;
Journal_Title :
Magnetics, IEEE Transactions on
