A comparison between different methods for evaluating the particle interactions in magnetic recording systems

Author

Bottoni, G. ; Candolfo, D. ; Cecchetti, A.

Author_Institution

Dipartimento di Fisica, Ferrara Univ., Italy

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1660

Lastpage

1662

Abstract

Two different methods for the determination of the magnetic interparticle interactions in recording systems are compared. The first one is that based on the evaluation of the deviation Δm from the Wohlfarth equation for noninteracting particles which requires the measurement of the remanence curves. The other is an easier procedure which consists in the determination of the deviation Δm* from an equation based on the initial magnetization curve and the hysteresis loop. For systems of oriented uniaxial anisotropy particles the solution is generally Δm≅2Δm*, while for systems of oriented multiaxial particles or for random oriented particles it is Δm≅4Δm*. The advantage of the second method is its applicability to systems where the initial curve and the hysteresis loop must be corrected by the demagnetizing field as for CoCr films magnetized perpendicularly to the film plane

Keywords

magnetic anisotropy; magnetic hysteresis; magnetic particles; magnetic recording; remanence; Wohlfarth equation; demagnetizing field; hysteresis loop; initial magnetization curve; magnetic interparticle interactions; magnetic recording systems; oriented multiaxial particles; oriented uniaxial anisotropy; random oriented particles; remanence curves; Anisotropic magnetoresistance; Demagnetization; Equations; Magnetic anisotropy; Magnetic hysteresis; Magnetic recording; Magnetization; Particle measurements; Perpendicular magnetic anisotropy; Remanence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706648

Filename

706648