HEAT-ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE

Title:

HEAT-ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/093233

Kind Code:

A1

Abstract:

A first magnetic layer (106) and a second magnetic layer (107) are stacked in that order on a substrate (101). The first magnetic layer (106) has a granular structure containing crystal grains of any of an FePt alloy having an L10 structure, an CoPt alloy having an L10 structure, or an CoPt alloy having an L11 structure, and further containing a grain boundary segregation material of at least one of SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO, ZnO, MgO, and C, wherein the content ratio of the grain boundary segregation material in the first magnetic layer (106) decreases from the side facing the substrate (101) towards the side facing the second magnetic layer (107).

Inventors:

KANBE Tetsuya (5-1 Yawata Kaigan dori, Ichihara-sh, Chiba 67, 〒2900067, JP)
神邊　哲也 (〒67 千葉県市原市八幡海岸通５番の１　昭和電工エレクトロニクス株式会社内 Chiba, 〒2900067, JP)
HASHIMOTO Atsushi (5-1 Yawata Kaigan dori, Ichihara-sh, Chiba 67, 〒2900067, JP)

Application Number:

JP2011/051183

Publication Date:

August 04, 2011

Filing Date:

January 24, 2011

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Assignee:

SHOWA DENKO K.K. (13-9, Shibadaimon 1-chome Minato-k, Tokyo 18, 〒1058518, JP)
昭和電工株式会社 (〒18 東京都港区芝大門一丁目１３番９号 Tokyo, 〒1058518, JP)
KANBE Tetsuya (5-1 Yawata Kaigan dori, Ichihara-sh, Chiba 67, 〒2900067, JP)
神邊　哲也 (〒67 千葉県市原市八幡海岸通５番の１　昭和電工エレクトロニクス株式会社内 Chiba, 〒2900067, JP)

International Classes:

G11B5/66; G11B5/02; G11B5/65

Attorney, Agent or Firm:

SHIGA Masatake et al. (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)

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Claims:

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