Title :
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
fDate :
7/1/1998 12:00:00 AM
Abstract :
Difficulties exist in identifying the intergranular exchange coupling constant (he) via magnetic properties measurements and TEM observation of actual media. The he 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 (hm ) and the grain geometry, were obtained from measuring the magnetic properties and observing the microstructure of actual media by TEM. The hm 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;
Journal_Title :
Magnetics, IEEE Transactions on
