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

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3778

Lastpage

3780

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800662

Filename

800662