公开(公告)号：US09886977B1

公开(公告)日：2018-02-06

申请号：US15389432

申请日：2016-12-22

Applicant: Western Digital Technologies, Inc. ,  Western Digital Technologies, Inc.

Inventor： Oleg Mryasov ,  Alan Kalitsov ,  Hoan Ho ,  Paul Dorsey ,  Gerardo Bertero

IPC: G11B5/72 ,  G11B5/667 ,  G11B5/725 ,  G11B5/65 ,  G11B5/851 ,  G11B5/00

CPC classification number: G11B5/656 ,  G11B5/66 ,  G11B2005/0021

Abstract: A recording medium having improved signal-to-noise ratio (SNR) capabilities includes dual cap layers over the recording layer, where the Curie temperature of the first cap layer over the recording layer is greater than the Curie temperature of the recording layer, and the Curie temperature of the second cap layer over the first cap layer is greater than the Curie temperature of the first cap layer. The first cap layer may be composed of a magnetically hard material, such as L10 CoPt, where the second cap layer may be composed of a magnetically soft material, such as Co. Such a medium is particularly useful in the context of heat-assisted magnetic recording (HAMR).

公开(公告)号：US20170206919A1

公开(公告)日：2017-07-20

申请号：US15476466

申请日：2017-03-31

Applicant: FUJI ELECTRIC CO., LTD.

Inventor： Akira Furuta ,  Hiroto Kikuchi ,  Hiroyasu Kataoka ,  Takehito Shimatsu

IPC: G11B5/66 ,  C23C14/14 ,  G11B5/851 ,  G11B5/65 ,  G11B5/82

CPC classification number: G11B5/66 ,  C23C14/14 ,  C23C14/185 ,  C23C14/34 ,  G11B5/653 ,  G11B5/656 ,  G11B5/82 ,  G11B5/851

Abstract: The purpose of the present invention is to provide a magnetic recording medium making secondary growth of magnetic crystal grains inhibited, having a magnetic recording layer having a large film thickness, and exhibiting excellent magnetic characteristics, and to provide a method for producing the medium. A magnetic recording medium according to the present invention includes a substrate and a magnetic recording layer that includes a lower layer and an upper layer, in which the lower layer and the upper layer include magnetic crystal grains formed of an ordered alloy and non-magnetic grain boundaries, the lower layer is formed by depositing Bi, C and an element constituting the ordered alloy, and the upper layer is formed by depositing C and an element constituting the ordered alloy. The present invention also provides a method for producing the above-described magnetic recording medium.

公开(公告)号：US20170148477A1

公开(公告)日：2017-05-25

申请号：US14946648

申请日：2015-11-19

Applicant: HGST Netherlands B.V.

Inventor： Shun Tonooka ,  Masayoshi Shimizu ,  Miki Nishida ,  Hiroyuki Katada

IPC: G11B5/66 ,  G11B5/65 ,  G11B5/73

CPC classification number: G11B5/66 ,  G11B5/656

Abstract: A magnetic media having a lateral exchange control layer formed on a magnetic oxide layer of a magnetic recording layer. A cap layer is formed over the lateral exchange control layer. The lateral exchange control layer can be an alloy comprising Co and one or more of W, Ru, Hf, Ta, Nb and Fe. The lateral exchange control layer has the highest magnetic saturation moment among all the recording layers, and increases spacing between magnetic grains (e.g. increased non-magnetic boundary width), thereby reducing lateral exchange sigma. The presence of lateral exchange control increases signal to noise ratio and reduces bit error rate and increases areal density.

公开(公告)号：US09449632B2

公开(公告)日：2016-09-20

申请号：US13432931

申请日：2012-03-28

Applicant: Toshikazu Irisawa ,  Atsushi Hashimoto

Inventor： Toshikazu Irisawa ,  Atsushi Hashimoto

IPC: C23C14/34 ,  G11B5/73 ,  C23C14/00 ,  C23C14/16 ,  C30B23/02 ,  C30B29/52 ,  G11B5/65 ,  G11B5/66 ,  C30B23/00 ,  G11B5/851

CPC classification number: G11B5/7325 ,  C23C14/0036 ,  C23C14/0042 ,  C23C14/165 ,  C30B23/002 ,  C30B23/025 ,  C30B29/52 ,  G11B5/656 ,  G11B5/66 ,  G11B5/851

Abstract: A method for manufacturing a magnetic recording medium including at least a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer that controls an orientation of an immediate upper layer, and a perpendicular magnetic layer in which a magnetization easy axis is mainly perpendicularly oriented with respect to the non-magnetic substrate so as to be laminated one another on the non-magnetic substrate. The perpendicular magnetic layer includes two or more magnetic layers, and each layer is subjected to a crystal growth such that each crystal grain composing each magnetic layer forms a columnar crystal continuous in a thickness direction together with the crystal grains composing the orientation control layer. The orientation control layer, formed of a Co—Cr alloy, is formed by the reactive sputtering using a mixture of a sputtering gas and nitrogen.

Abstract translation: 一种制造磁记录介质的方法，所述磁记录介质至少包括非磁性基板，软磁性底层，控制立即上层的取向的取向控制层以及磁化容易轴主要垂直的垂直磁性层 相对于非磁性基板被定向以在非磁性基板上彼此层叠。 垂直磁性层包含两层以上的磁性层，各层进行晶体生长，使构成各磁性层的各晶粒与构成取向控制层的晶粒一起形成与厚度方向连续的柱状晶体。 通过使用溅射气体和氮气的混合物的反应溅射形成由Co-Cr合金形成的取向控制层。

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：US09208812B2

公开(公告)日：2015-12-08

申请号：US13817645

申请日：2011-08-19

Applicant: Toshiyuki Sawada ,  Hiroyuki Hasegawa ,  Atsushi Kishida

Inventor： Toshiyuki Sawada ,  Hiroyuki Hasegawa ,  Atsushi Kishida

IPC: C22C19/07 ,  C23C14/34 ,  G11B5/65 ,  G11B5/667 ,  G11B5/851

CPC classification number: G11B5/656 ,  C22C19/07 ,  C23C14/3407 ,  C23C14/3414 ,  G11B5/667 ,  G11B5/851

Abstract: There is provided a soft magnetic alloy for a perpendicular magnetic recording medium having a low coercive force, high amorphous properties, high corrosion resistance, and a high hardness; and a sputtering target for producing a thin film of the alloy. The alloy comprises in at. %: 6 to 20% in total of one or two of Zr and Hf; 1 to 20% of B; and 0 to 7% in total of one or two or more of Ti, V, Nb, Ta, Cr, Mo, W, Ni, Al, Si, and P; and the balance Co and/or Fe and unavoidable impurities. The alloy further satisfies 6≦2×(Zr%+Hf%)−B%≦16 and 0≦Fe%/(Fe%+Co%)

Abstract translation: 提供了一种用于垂直磁记录介质的软磁合金，其具有低的矫顽力，高非晶性，高耐腐蚀性和高硬度; 以及用于制造合金薄膜的溅射靶。 该合金包括在。 ％：Zr和Hf中的一种或两种的总共6〜20％ B的1〜20％ Ti，V，Nb，Ta，Cr，Mo，W，Ni，Al，Si和P中的一种或两种以上为0〜7％ 余量为Co和/或Fe和不可避免的杂质。 合金进一步满足6＆nlE; 2×（Zr％+ Hf％）-B％＆nlE; 16和0＆nlE; Fe％/（Fe％+ Co％）<0.20。

公开(公告)号：US09064520B2

公开(公告)日：2015-06-23

申请号：US13478739

申请日：2012-05-23

Applicant: Tetsuya Osaka ,  Atsushi Sugiyama ,  Takuma Hachisu ,  Tomoo Shige ,  Masato Fukushima ,  Akira Yamane ,  Akira Sakawaki

Inventor： Tetsuya Osaka ,  Atsushi Sugiyama ,  Takuma Hachisu ,  Tomoo Shige ,  Masato Fukushima ,  Akira Yamane ,  Akira Sakawaki

IPC: G11B5/706 ,  G11B5/82 ,  G11B5/73 ,  G11B5/66 ,  G11B5/65 ,  G11B5/84

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B5/656 ,  G11B5/66 ,  G11B5/8404 ,  G11B5/855

Abstract: According to the present invention, a magnetic recording medium is provided including a disk-shaped non-magnetic substrate and at least a perpendicular magnetic layer formed on the disk-shaped non-magnetic substrate, wherein the perpendicular magnetic layer has a structure in which an FePt or CoPt nanoparticle array is formed on a formation surface, on which a plurality of striations each having a circumferential directional component are formed, by a texturing treatment; a manufacturing method thereof; and a magnetic record/reproduction apparatus including the magnetic recording medium or a magnetic recording medium manufactured according to the manufacturing method.

Abstract translation: 根据本发明，提供一种磁记录介质，其包括盘状非磁性基板和至少形成在盘状非磁性基板上的垂直磁性层，其中垂直磁性层具有以下结构： FePt或CoPt纳米颗粒阵列形成在形成表面上，通过纹理处理形成多个具有圆周方向分量的条纹; 其制造方法; 以及包括根据制造方法制造的磁记录介质或磁记录介质的磁记录/再现设备。

公开(公告)号：US08932668B2

公开(公告)日：2015-01-13

申请号：US13103410

申请日：2011-05-09

Applicant: Dong Chul Pyun ,  Heemin Yoo ,  Hirohisa Omoto ,  Takayuki Yoshida

Inventor： Dong Chul Pyun ,  Heemin Yoo ,  Hirohisa Omoto ,  Takayuki Yoshida

IPC: B22F1/02 ,  B22F1/00 ,  G11B5/706

CPC classification number: B22F1/0062 ,  B22F1/0088 ,  B22F1/02 ,  C09D133/20 ,  C09D175/06 ,  G11B5/653 ,  G11B5/656 ,  G11B5/70615 ,  G11B5/70621 ,  H01F1/09 ,  Y10T428/12181 ,  Y10T428/2982

Abstract: A metallic magnetic powder where a primary particle of each metallic magnetic particle is a powder without forming an aggregate, and a method of making the same that includes manufacturing a metallic magnetic powder constituted of metallic magnetic particles, containing a metallic magnetic phase, with Fe, or Fe and Co as main components, rare earth elements, or yttrium and one or more non-magnetic components removing the non-magnetic component from the metallic magnetic with a reducing agent, while making a complexing agent exist for forming a complex with the non-magnetic component in water; oxidizing the metallic magnetic particle with the non-magnetic component removed; substituting water adhered to the oxidized metallic magnetic particle with an organic solvent; andcoating the surface of the metallic magnetic particle with an organic matter different from the organic solvent, while maintaining a wet condition of the metallic magnetic particle with the organic solvent adhered thereto.

Abstract translation: 一种金属磁性粉末，其中每个金属磁性颗粒的一次颗粒是不形成聚集体的粉末，其制造方法包括制造含有金属磁性相的金属磁性颗粒与Fe， 或Fe和Co作为主要组分，稀土元素或钇以及一种或多种非磁性组分，用还原剂从金属磁性中除去非磁性组分，同时制备与非磁性组分形成络合物的络合剂， 水中的磁性成分; 在去除了非磁性部件的情况下氧化金属磁性颗粒; 用有机溶剂代替附着在氧化金属磁性颗粒上的水; 并且用与有机溶剂不同的有机物涂覆金属磁性颗粒的表面，同时保持金属磁性颗粒与粘附有机溶剂的湿润状态。

公开(公告)号：US08895164B2

公开(公告)日：2014-11-25

申请号：US12457394

申请日：2009-06-09

Applicant: Tuqiang Li ,  Shunji Takenoiri ,  Yuko Ueki

Inventor： Tuqiang Li ,  Shunji Takenoiri ,  Yuko Ueki

IPC: G11B5/66 ,  G11B5/667 ,  G11B5/65

CPC classification number: G11B5/667 ,  G11B5/656

Abstract: A perpendicular magnetic recording medium, which includes a nonmagnetic substrate, and a first underlayer in the form of a soft magnetic under-layer (SUL), a second underlayer, an intermediate layer, a magnetic recording layer, a protective layer, and a lubricant layer sequentially laminated on the nonmagnetic substrate. The SUL has a plurality of SUL layers including a type-A SUL layer, a plurality of type-B SUL layers including at least two adjacent type-B SUL layers, and a nonmagnetic metal spacer layer disposed between the two adjacent type-B SUL layers. The type-A SUL layer may include a material selected from Co, Fe and Ni, a material selected from Cr, V and Ti, and a material selected from W, Zr, Ta and Nb. Each of the type-B SUL layers is in antiferromagnetic coupling, and may include a material selected from Co, Fe and Ni, a material selected from Cr, V and Ti, and a material selected from W, Zr, Ta and Nb.

Abstract translation: 包括非磁性衬底的垂直磁记录介质和软磁性底层（SUL），第二底层，中间层，磁记录层，保护层和润滑剂形式的第一底层 层顺序层压在非磁性基板上。 SUL具有包括A型SUL层，包括至少两个相邻B型SUL层的多个B型SUL层和设置在两个相邻B型SUL层之间的非磁性金属间隔层的多个SUL层 层。 A型SUL层可以包括选自Co，Fe和Ni的材料，选自Cr，V和Ti的材料，以及选自W，Zr，Ta和Nb的材料。 B型SUL层中的每一层均为反铁磁耦合，并且可以包括选自Co，Fe和Ni的材料，选自Cr，V和Ti的材料，以及选自W，Zr，Ta和Nb的材料。

公开(公告)号：US20140153128A1

公开(公告)日：2014-06-05

申请号：US13793409

申请日：2013-03-11

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Hironori TEGURI ,  Akira WATANABE ,  Tomoko TAGUCHI

IPC: G11B5/738 ,  G11B5/02 ,  G11B5/851 ,  G11B5/65 ,  G11B5/66

CPC classification number: G11B5/73 ,  G11B5/65 ,  G11B5/653 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/851 ,  G11B2005/0021

Abstract: According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed on a substrate and including magnetic grains and a grain boundary formed between the magnetic grains, the grain boundary includes a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first and second grain boundaries suppresses thermal conduction.

Abstract translation: 根据一个实施例，磁记录介质包括形成在基板上的磁记录层，包括磁性颗粒和形成在磁性颗粒之间的晶界，晶界包括具有第一导热性的第一晶界和第二晶粒 边界形成在第一晶界并且具有不同于第一热导率的第二热导率，并且第一和第二晶界中的至少一个抑制热传导。