ESTIMATION OF ULTIMATE SWITCHING SPEEDS IN HARD MAGNETIC RECORDING MEDIA BY FERROMAGNETIC-RESONANCE LINEWIDTH MEASUREMENTS

被引：3

作者：

ARTMAN, JO ^{[1
]}

ALEXANDER, C ^{[1
]}

CATES, JC ^{[1
]}

PARKER, MR ^{[1
]}

机构：

[1] CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 104卷 / pt 2期

关键词：

Recording;

D O I：

10.1016/0304-8853(92)90450-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Analytical solutions of the Gilbert equation show that the switching coefficient S(w) can be expressed as S(w) = (2A / gamma)(alpha(2) + 1)/alpha, where gamma is the gyromagnetic ratio and A is a geometrical constant which depends, inter alia, on the initial and final directions of the magnetization vector. From published microstrip measurements of S(w) in a number of recording media, including gamma-FeO2O3, CrO2, Co-doped gamma-Fe2O3, and NiFe and from in-house measurements of FMR linewidth in the same materials at 34.4 GHz we find that the above equation agrees fairly well with experiment for an A value of about 0.5. On this basis, it appears that FMR linewidths can be used fairly reliably to predict ultimate switching speeds of intrinsically fast media such as BaFe and DAT.

引用

页码：977 / 978

页数：2