Seagate Technology Incorporated

Shanghsien S Rou

Li-Lien Lee

Michael C Wu

Connie C Liu

Tao Zhang

Li Tang

Bogdan Florin Valcu

Kai-Chieh Chang

Wen Jiang

An apparatus may include a composite soft underlayer and a perpendicular magnetic recording layer overlying the composite soft underlayer. The composite soft underlayer may include a growth template layer, a negative magnetic anisotropy layer overlying the growth template layer, and a magnetically soft layer overlying the negative magnetic anisotropy layer. In some embodiments, the negative magnetic anisotropy layer includes a plurality of grains, and substantially all the grains have negative magnetic anisotropy along an axis substantially perpendicular to a major plane of the composite soft underlayer. In some embodiments, the negative magnetic anisotropy layer includes a thickness of less than or equal to about 3 nm.

Composite soft underlayer including negative anisotropy material

A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr&#x3c;16 at % and Ta&#x3c;6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has &#x3c;10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.

Method of making a multilayered magnetic structure

High density magnetic recording media

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Fremont, CA, United States of America

Shanghsien S Rou