Magnetic interaction in Co-Cr-Pt-Ta-Nb media: utilization of micromagnetic simulation

Author

Akimoto, Hideyuki ; Okamoto, Iwao ; Shinohara, Masayoshi

Author_Institution

Lab. of File Memory, Fujitsu Ltd., Atsugi, Japan

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1597

Lastpage

1599

Abstract

Difficulties exist in identifying the intergranular exchange coupling constant (h_e) via magnetic properties measurements and TEM observation of actual media. The h_e was estimated to be 0.13 for CoCr₁₂Pt₅TaNb/CrMo and 0.115 for CoCr ₁₉Pt₅TaNb/CrMo via micromagnetic simulation. The other parameters, which are the magnetostatic coupling constant (h_m) and the grain geometry, were obtained from measuring the magnetic properties and observing the microstructure of actual media by TEM. The h_m is 0.11 for CoCr₁₂Pt₅TaNb and 0.09 for CoCr₁₉Pt₅TaNb. The parameters were ascertained to be suitable by comparing the MFM images of the DC demagnetized state and the medium noise dependence of the linear density between the micromagnetic simulation and the experiments

Keywords

chromium alloys; cobalt alloys; coercive force; exchange interactions (electron); ferromagnetic materials; grain size; magnetic force microscopy; magnetic hysteresis; magnetic recording noise; magnetic thin films; niobium alloys; platinum alloys; remanence; tantalum alloys; transmission electron microscopy; CoCr₁₂Pt₅TaNb-CrMo; CoCr₁₂Pt₅TaNb/CrMo; CoCr₁₉Pt₅TaNb-CrMo; CoCr₁₉Pt₅TaNb/CrMo; CoCrPtTaNb; DC demagnetized state; EDS; MFM images; TEM; coercivity; free energy; grain geometry; hysteresis loops; intergranular exchange coupling constant; linear density; magnetic clusters; magnetic interaction; magnetostatic coupling constant; medium noise dependence; micromagnetic simulation; microstructure; remanent squareness; thin film recording media; Couplings; Demagnetization; Magnetic anisotropy; Magnetic force microscopy; Magnetic properties; Magnetostatics; Micromagnetics; Microstructure; Perpendicular magnetic anisotropy; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706627

Filename

706627