公开(公告)号：US10553242B2

公开(公告)日：2020-02-04

申请号：US16445801

申请日：2019-06-19

Applicant: SHOWA DENKO K.K.

Inventor： Lei Zhang ,  Takayuki Fukushima ,  Chen Xu ,  Kazuya Niwa ,  Hisato Shibata ,  Takehiro Yamaguchi ,  Tetsuya Kanbe ,  Tomoo Shige

IPC: G11B5/65 ,  G11B5/00

Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer that is (001)-oriented. In the magnetic layer, a first magnetic layer and a second magnetic layer are stacked in this order from the underlayer side. The first magnetic layer and the second magnetic layer include an alloy having an L10 structure. The second magnetic layer includes a ferrite at grain boundaries of magnetic grains. The ferrite is one or more kinds selected from the group consisting of NiFe2O4, MgFe2O4, MnFe2O4, CuFe2O4, ZnFe2O3, CoFe2O4, BaFe2O4, SrFe2O4, and Fe3O4. A Curie temperature of the magnetic grains is lower than a Curie temperature of the ferrite.

公开(公告)号：US09934810B2

公开(公告)日：2018-04-03

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: G11B5/66 ,  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.

公开(公告)号：US09361924B2

公开(公告)日：2016-06-07

申请号：US14394958

申请日：2013-05-10

Applicant: SHOWA DENKO K.K.

Inventor： Kazuya Niwa ,  Tetsuya Kanbe ,  Yuji Murakami ,  Lei Zhang

IPC: G11B5/73 ,  G11B5/65 ,  G11B5/66 ,  G11B11/105 ,  G11B5/00

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B5/653 ,  G11B5/656 ,  G11B5/66 ,  G11B11/10589 ,  G11B2005/0021 ,  G11B2005/0024

Abstract: A thermally-assisted magnetic recording medium or a microwave-assisted magnetic recording medium includes: an orientation control layer (104) that is formed on a substrate (101); an underlayer (10) that is formed on the orientation control layer (104); and a magnetic layer (108) that is formed on the underlayer (10) and contains an alloy having an L10 type crystal structure as a main component, in which the underlayer (10) includes an MgO underlayer (107) that contains MgO and has a (100) orientation and a nitride underlayer (106) that contains at least one nitride selected from the group consisting of TaN, NbN, and HfN and has a (100) orientation.

Abstract translation: 热辅助磁记录介质或微波辅助磁记录介质包括：形成在基板（101）上的取向控制层（104）; 形成在取向控制层（104）上的底层（10）; 以及形成在所述下层（10）上并含有具有L10型晶体结构的合金作为主要成分的磁性层（108），其中所述底层（10）包括含有MgO的MgO底层（107），并且具有 （100）取向和含有选自TaN，NbN和HfN中的至少一种氮化物并具有（100）取向的氮化物底层（106）。

公开(公告)号：US09007880B2

公开(公告)日：2015-04-14

申请号：US14385840

申请日：2013-04-30

Applicant: Showa Denko K.K.

Inventor： Tetsuya Kanbe ,  Kazuya Niwa ,  Yuji Murakami ,  Lei Zhang

IPC: G11B11/00 ,  G11B5/82 ,  G11B5/706 ,  G11B5/738 ,  G11B5/09 ,  G11B5/48 ,  G11B5/00

CPC classification number: G11B5/738 ,  G11B5/09 ,  G11B5/4866 ,  G11B5/6088 ,  G11B5/65 ,  G11B5/7325 ,  G11B5/82 ,  G11B2005/0021

Abstract: A thermally assisted magnetic recording medium (1) includes a substrate (101), an underlayer (3) that is formed above the substrate (101), and a magnetic layer (107) that is formed on the underlayer (3) and contains an alloy having an L10 structure as a main component. The underlayer (3) is formed by continuously laminating a first underlayer (104) having a BCC structure with a lattice constant that is 0.302 to 0.332 nm, a second underlayer (105) that has a NaCl structure including C, and a third underlayer (106) that is composed of MgO.

Abstract translation: 热辅助磁记录介质（1）包括基板（101），形成在基板（101）上方的底层（3）和形成在底层（3）上的磁性层（107） 合金，其具有L10结构作为主要成分。 底层（3）通过连续地层叠具有0.302〜0.332nm的晶格常数的BCC结构的第一底层（104），具有包含C的NaCl结构的第二底层（105）和第三底层（ 106），由MgO组成。

公开(公告)号：US20150049594A1

公开(公告)日：2015-02-19

申请号：US14385840

申请日：2013-04-30

Applicant: SHOWA DENKO K.K.

Inventor： Tetsuya Kanbe ,  Kazuya Niwa ,  Yuji Murakami ,  Lei Zhang

IPC: G11B5/738 ,  G11B5/48 ,  G11B5/09

CPC classification number: G11B5/738 ,  G11B5/09 ,  G11B5/4866 ,  G11B5/6088 ,  G11B5/65 ,  G11B5/7325 ,  G11B5/82 ,  G11B2005/0021

Abstract: A thermally assisted magnetic recording medium (1) includes a substrate (101), an underlayer (3) that is formed above the substrate (101), and a magnetic layer (107) that is formed on the underlayer (3) and contains an alloy having an L10 structure as a main component. The underlayer (3) is formed by continuously laminating a first underlayer (104) having a BCC structure with a lattice constant that is 0.302 to 0.332 nm, a second underlayer (105) that has a NaCl structure including C, and a third underlayer (106) that is composed of MgO.

Abstract translation: 热辅助磁记录介质（1）包括基板（101），形成在基板（101）上方的底层（3）和形成在底层（3）上的磁性层（107） 合金，其具有L10结构作为主要成分。 底层（3）通过连续地层叠具有0.302〜0.332nm的晶格常数的BCC结构的第一底层（104），具有包含C的NaCl结构的第二底层（105）和第三底层（ 106），由MgO组成。