Relationships between high density recording performance and particle coercivity distribution

Author

Tagawa, Ikuya ; Nakamura, Yoshihisa

Author_Institution

Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

4975

Lastpage

4977

Abstract

Most magnetic recording media are composed of magnetic crystalline particles having inherent coercivity originating from crystalline and shape anisotropies. The relationship between the statistical distribution of the particle coercivity and the high density magnetic recording characteristics was investigated. In order to estimate the width of the particle coercivity distribution (PCD) in a medium, a method in which the PCD can be obtained from M-H major and minor curves. The PCD correlates strongly with the coercivity squareness and the switching field distribution, and needs no compensation for the demagnetizing field, even in perpendicular recording media. It was shown that a sharper PCD resulted in better recording performance, particularly in perpendicular recording media

Keywords

coercive force; magnetic anisotropy; magnetic hysteresis; magnetic properties of fine particles; magnetic recording; magnetic switching; magnetisation; Ba ferrite; BaFe₁₂O₁₉; Co-Fe₂O₃; CoCr-NiFe double layer; M-H major curves; SPT head; coercivity squareness; computer simulation; crystalline anisotropy; demagnetizing field; high density magnetic recording characteristics; magnetic crystalline particles; magnetic recording media; magnetisation; minor curves; particle coercivity distribution; perpendicular recording media; ring head; shape anisotropies; statistical distribution; switching field distribution; Anisotropic magnetoresistance; Coercive force; Crystallization; Demagnetization; Magnetic anisotropy; Magnetic recording; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Shape; Statistical distributions;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278712

Filename

278712