公开(公告)号：US20150117166A1

公开(公告)日：2015-04-30

申请号：US14503503

申请日：2014-10-01

Applicant: SHOWA DENKO K.K.

Inventor： Lei ZHANG ,  Tetsuya KANBE ,  Yuji MURAKAMI ,  Kazuya NIWA

IPC: G11B5/73

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B11/10584 ,  G11B2005/0021

Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L10 type crystal structure as a main component thereof, and a plurality of underlayers arranged between the substrate and the magnetic layer. The plurality of underlayers include at least one crystalline underlayer which has a (100) orientation, and includes W as a main component thereof and one or more kinds of elements selected from a group consisting of Fe, Ni, Co, Hf, Zr, Y, Be, Ce, La, and Sc.

Abstract translation: 磁记录介质包括基板，包括具有L10型晶体结构的合金作为其主要成分的磁性层以及布置在基板和磁性层之间的多个底层。 多个底层包括至少一个具有（100）取向的晶体底层，并且包括W作为其主要成分，以及选自Fe，Ni，Co，Hf，Zr，Y中的一种或多种元素 ，Be，Ce，La和Sc。

公开(公告)号：US20150036242A1

公开(公告)日：2015-02-05

申请号：US14333617

申请日：2014-07-17

Applicant: SHOWA DENKO K.K.

Inventor： Lei ZHANG ,  Tetsuya KANBE ,  Yuji MURAKAMI ,  Kazuya NIWA

IPC: G11B5/73

CPC classification number: G11B5/7325 ,  G11B5/65

Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having a L10 type crystal structure as a main component thereof, and a plurality of underlayers arranged between the substrate and the magnetic layer. The plurality of underlayers include a first underlayer including two or more elements selected from a group consisting of Ta, Nb, Ti, and V, and one or more elements selected from a group consisting of W and Mo, and a second underlayer including MgO.

Abstract translation: 磁记录介质包括基板，包括具有L10型晶体结构的合金作为其主要成分的磁性层以及布置在基板和磁性层之间的多个底层。 多个底层包括包含选自Ta，Nb，Ti和V中的两种或更多种元素的第一底层和选自W和Mo的一种或多种元素，以及包含MgO的第二底层。

公开(公告)号：US20140308542A1

公开(公告)日：2014-10-16

申请号：US14220332

申请日：2014-03-20

Applicant: Showa Denko K.K.

Inventor： Lei ZHANG ,  Tetsuya KANBE ,  Yuji MURAKAMI ,  Kazuya NIWA

IPC: G11B5/73

CPC classification number: G11B5/73 ,  G11B5/7325

Abstract: A magnetic recording medium includes a substrate, multiple underlayers formed on the substrate, and a magnetic layer formed on the multiple underlayers. A main component of the magnetic layer is an alloy having a L10 structure. At least one of the multiple underlayers is a crystalline underlayer containing W. The W is a main component of the crystalline underlayer. The crystalline underlayer further contains 1 mol % or more to 20 mol % or less of one or more kinds of elements selected from B, Si, and C. A barrier layer including a material having a NaCl structure is formed between the crystalline underlayer and the magnetic layer.

Abstract translation: 磁记录介质包括基板，形成在基板上的多个底层，以及形成在多个底层上的磁性层。 磁性层的主要成分是具有L10结构的合金。 多个底层中的至少一个是含有W的晶体底层.W是晶体底层的主要成分。 结晶性底层还含有1mol％以上至20mol％以下的选自B，Si，C中的1种以上的元素。在结晶性底层和 磁性层。

公开(公告)号：US20140064047A1

公开(公告)日：2014-03-06

申请号：US13972041

申请日：2013-08-21

Applicant: SHOWA DENKO K.K.

Inventor： Kazuya NIWA ,  Tetsuya KANBE ,  Yuji MURAKAMI ,  Lei ZHANG

IPC: G11B13/08 ,  G11B5/73

CPC classification number: G11B13/08 ,  G11B5/65 ,  G11B5/73 ,  G11B5/7325 ,  G11B2005/0024

Abstract: A magnetic recording medium of the present invention includes an under layer formed on a substrate, and a magnetic layer, formed on the under layer, which contains an alloy having an L10-type crystal structure as a main component. The under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 Å≦a

Abstract translation: 本发明的磁记录介质包括形成在基板上的底层和形成在下层上的磁性层，其含有具有L10型晶体结构的合金作为主要成分。 底层按照从衬底侧开始的顺序为具有晶格常数a为a <3.04的第一底层，具有晶格常数a为3.04的BCC结构的第二下层，a <3.18 Å，具有晶格常数a为3.18Å@ 3.31的BCC结构的第三下层，以及具有NaCl型晶体结构的上下层。 第一底层具有B2结构，或具有含有Cr作为主要成分的BCC结构。 在本发明的磁记录介质中，使用热辅助磁记录型或微波辅助磁记录型来记录信息。