FORC diagrams of Magnetic perpendicular recording media

Yin Jinhua; Chen Jingsheng; Wu Lianjun

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FORC diagrams of Magnetic perpendicular recording media

Yin Jinhua 1 * #,Chen Jingsheng 2,Wu Lianjun 3

1.Department of Physics, University of Science and Technology Beijing, Beijing 100083

2.department of Materials science and engineering , national university of singapore, 117608, singapore.

3.Advanced Media R&D, Western Digital (Singapore) Pte Ltd, Singapore

*Correspondence author

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Funding: The Specialized Research Fund for the Doctoral Program of Higher Education of China （No.Grant No. 20090006120019）

Opened online:12 October 2012

Accepted by: none

Citation: Yin Jinhua,Chen Jingsheng,Wu Lianjun.FORC diagrams of Magnetic perpendicular recording media[OL]. [12 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4491156

First Order Reversal Curve (FORC) diagrams have been investigated in perpendicular media. Our samples include Co/Pd multilayer and FePt films with different α (M-H loop slope parameter, α = 4α (dM/dH) at H=Hc). α can be used to characterize the exchange coupling between the grains in perpendicular media. It is found that the FORC diagrams of perpendicular media with strong exchange coupling are quite different from that of perpendicular media with weak exchange coupling. Because the FORC diagrams can separate the distributions of magnetic phases with different magnetic properties, we expect the FORC diagram is a possible method for us to investigate separately the magnetic properties of different magnetic phases in one sample. We compared our FORC diagram results with XPS and magnetization decay measurement.

Keywords:first order reverssal curves; perpendicular magnetic recording media; magnetic properties

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