Determination of first and second magnetic anisotropy constants of magnetic recording media

Endo, Yasushi; Kitakami, Osamu; Okamoto, Satoshi; Shimada, Yutaka
September 2000
Applied Physics Letters;9/11/2000, Vol. 77 Issue 11
Academic Journal
We propose a simple method to evaluate the first and second magnetic anisotropy constants of high-density magnetic recording media with their easy axis in the film plane. By measuring the magnetization curve along the film normal, uniaxial anisotropy constants K[sub 1] and K[sub 2] can be determined simultaneously. The present method has been applied to (11·0) oriented CoCrPtTa hard disk media. The measured anisotropy constants are presented along with their temperature dependence. We also point out serious shortcomings of the currently used evaluation methods, such as the rotational hysteresis method and the singular point detection technique, which usually overestimate the magnetic anisotropy constant. © 2000 American Institute of Physics.


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