Magnetic interactions in CoCrPt-oxide based perpendicular magnetic recording media

Magnetic interactions in CoCrPt-oxide based perpendicular magnetic recording media
Title:
Magnetic interactions in CoCrPt-oxide based perpendicular magnetic recording media
Other Titles:
Journal of Applied Physics
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Publication Date:
28 October 2014
Citation:
J. Appl. Phys. 116, 163909 (2014)
Abstract:
First order reversal curves (FORC) method has been reported to be an efficient tool to study interaction between grains and layers of magnetic materials. Although a few studies have been carried out on perpendicular recording media in the past, a study on the effect of systematic variation of exchange interaction in granular perpendicular magnetic recording media on FORC contours has not been carried out in detail. Such a study will help to understand the use of FORC better. In this paper, we have made a systematic set of samples in order to study the variation in exchange coupling and its effect on FORC contours. The pressure during the deposition of the second ruthenium layer and the magnetic layer was varied to alter the separation between the grains and hence the exchange interaction between the grains in the CoCrPt-oxide recording layer. In addition, the thickness of Co-alloy cap layer was used as an additional tool to control the exchange interaction between the magnetic grains. The results indicated that the interaction field obtained from the FORC does not vary in a significant manner when the changes in exchange interaction are small. In comparison, the peak intensity of the FORC shows a clear trend as the exchange coupling is varied, making it a more suitable parameter to study the exchange and magnetostatic interactions in systems such as magnetic recording media.
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Funding Info:
Description:
Copyright (2014) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 116, 163909 (2014) and may be found at http://dx.doi.org/10.1063/1.4900537.
ISSN:
0021-8979
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