Magnetic properties of perpendicular magnetic recording media of granular-type FePt-MgO on laminated type soft underlayer

Yin Jinhua; Pan Liqing; Suzuki Takao

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Magnetic properties of perpendicular magnetic recording media of granular-type FePt-MgO on laminated type soft underlayer

Yin Jinhua 1 * #,Pan Liqing 2,Suzuki Takao 3

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

2.Department of Physics, University of Science and Technology Beijing, Beijing 100083, China

3.Information Storage Materials Laboratory, Toyota Technological Institute, 2-12-1, Hisakata, Tempaku-ku, Nagoya 468 8511, Japan.

*Correspondence author

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Funding: The Specialized Research Fund for the Doctoral Program of Higher Education of China （No.Grant No. 20090006120019）, the Grant-in-Aid for Scientific Research (A) by the Japanese Ministry of Education, Culture, Sports, Science and Technology（No.Grant No. 14205049）

Opened online:12 October 2012

Accepted by: none

Citation: Yin Jinhua,Pan Liqing,Suzuki Takao.Magnetic properties of perpendicular magnetic recording media of granular-type FePt-MgO on laminated type soft underlayer[OL]. [12 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4491153

The granular-type FePt-MgO films with the stack structure of [MgO 3nm/FePt 2nm]2/MgO 4nm/SiO2 4nm/[Fe-Ta-C/Ta]m=0-2/Fe-Ta-C/Glass disks were fabricated for perpendicular magnetic recording media applications. The total thickness of the soft under layer (SUL) is kept constant of 200 nm. The coercivity of the laminated type SUL is very low (<1 Oe), probably due to the magnetostatic interaction between adjacent nanocrystalline layers and expected to decrease the noise from SUL. The perpendicular coercivity, magnetic activation volume, and the exchange coupling between the recording layer of the disks with single SUL and laminated type SUL were systematically studied and compared. The disks with two-laminated SUL have a smaller exchange coupling, activation volume, squareness and higher Ku value compared with the disks with single and three-laminated SUL.

Keywords:perpendicular magnetic recording media; magnetic properties;soft underlayer

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