Title :
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
fDate :
11/1/1991 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
