公开(公告)号：US20190198051A1

公开(公告)日：2019-06-27

申请号：US16287651

申请日：2019-02-27

申请人： FUJI ELECTRIC CO., LTD.

发明人： Hiroyasu KATAOKA ,  Tsuyoshi YOSHIZAWA ,  Tomohiro MORIYA ,  Shinji UCHIDA ,  Hirohisa OYAMA ,  Takehito SHIMATSU

IPC分类号： G11B5/73 ,  G11B5/66

CPC分类号： G11B5/7379 ,  G11B5/64 ,  G11B5/66 ,  G11B5/73

摘要： A magnetic recording medium with a reduced average grain diameter and reduced grain diameter dispersion is provided. A magnetic recording medium having a magnetic property (magnetic anisotropy energy) applicable as a magnetic recording medium is provided. It is a magnetic recording medium containing a substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer containing an ordered alloy in this order, in which the second seed layer is composed of crystal grains having TiN as a main component, and a grain boundary material having at least one or more selected from the group consisting of metal oxides and carbon as a main component.

公开(公告)号：US20180261245A1

公开(公告)日：2018-09-13

申请号：US15885013

申请日：2018-01-31

申请人： SHOWA DENKO K.K.

发明人： Kazuya NIWA ,  Tetsuya KANBE ,  Yuji MURAKAMI ,  Lei ZHANG ,  Hisato SHIBATA ,  Takayuki FUKUSHIMA ,  Satoru NAKAJIMA ,  Takehiro YAMAGUCHI

IPC分类号： G11B5/65 ,  G11B5/39 ,  G11B5/73 ,  G11B5/012 ,  G11B5/74 ,  G11B5/714 ,  G11B5/187

CPC分类号： G11B5/656 ,  G11B5/012 ,  G11B5/1875 ,  G11B5/3133 ,  G11B5/3912 ,  G11B5/714 ,  G11B5/73 ,  G11B5/7325 ,  G11B5/746 ,  G11B2005/0021

摘要： The invention provides a magnetic recording medium with an excellent signal-to-noise ratio during reading by reducing the noise produced during writing of data onto the magnetic recording medium, and increasing the signal level. The assisted magnetic recording medium according to one embodiment comprising a substrate, a base layer, and a magnetic layer composed mainly of an alloy with an L10-type crystal structure, the assisted magnetic recording medium having a pinning layer in contact with the magnetic layer, and the pinning layer including Co or an alloy composed mainly of Co.

公开(公告)号：US10056103B2

公开(公告)日：2018-08-21

申请号：US14160955

申请日：2014-01-22

申请人： SHOWA DENKO K.K.

发明人： Ken Inoue ,  Gohei Kurokawa ,  Haruhisa Ohashi

IPC分类号： C23C14/34 ,  G11B5/851 ,  G11B5/738 ,  C23C14/08 ,  C23C14/54 ,  G11B5/73 ,  G11B5/84 ,  C23C14/06 ,  C23C14/16

CPC分类号： G11B5/851 ,  C23C14/0688 ,  C23C14/08 ,  C23C14/086 ,  C23C14/165 ,  C23C14/54 ,  G11B5/73 ,  G11B5/7325 ,  G11B5/8404

摘要： A method of manufacturing a magnetic recording medium, includes at least: forming an orientation control layer 3 that controls orientation of an immediately above layer thereof on a non-magnetic substrate 1; and forming a perpendicular magnetic layer 4 in which an easy axis of magnetization is mainly perpendicularly orientated to the non-magnetic substrate 1, in which the forming of the orientation control layer 3 includes forming a granular layer having a granular structure that includes Ru or a material in which Ru is a main component and an oxide having a melting point which is greater than or equal to 450° C. and less than or equal to 1000° C., by a sputtering method, and the forming of the perpendicular magnetic layer 4 includes growing crystal grains to form columnar crystals that are continuous in a thickness direction together with crystal grains that form the orientation control layer 3.

公开(公告)号：US20180040346A1

公开(公告)日：2018-02-08

申请号：US15723106

申请日：2017-10-02

申请人： FUJI ELECTRIC CO., LTD. ,  TOHOKU UNIVERSITY

发明人： Tomohiro MORIYA ,  Hitoshi NAKATA ,  Takehito SHIMATSU

IPC分类号： G11B5/84 ,  C23C14/02 ,  C23C14/35 ,  G11B5/738 ,  G11B5/851

CPC分类号： G11B5/8404 ,  C23C14/022 ,  C23C14/024 ,  C23C14/08 ,  C23C14/081 ,  C23C14/185 ,  C23C14/35 ,  G11B5/73 ,  G11B5/7379 ,  G11B5/851

摘要： The purpose of the present invention is to provide a magnetic recording medium having a stacked structure of a seed layer including (Mg1-xTix)O and a magnetic recording layer including an L10 ordered alloy, and having improved properties. The method for producing a magnetic recording layer according to the present invention includes the steps of: (1) preparing a substrate; (2) forming a seed layer including (Mg1-xTix)O onto the substrate; (3) plasma etching the seed layer in an atmosphere including inert gas; and (4) forming a magnetic recording layer including an ordered alloy onto the seed layer which has been subjected to the step (3).

公开(公告)号：US09865293B2

公开(公告)日：2018-01-09

申请号：US15603964

申请日：2017-05-24

申请人： HOYA CORPORATION

发明人： Takashi Maeda ,  Takumi Kuhara

IPC分类号： G11B5/73 ,  G11B5/82

CPC分类号： G11B5/73 ,  G11B5/7315 ,  G11B5/82

摘要： When waviness having a wavelength component of 10 to 500 μm in the circumferential direction of a main surface of a disk-shaped substrate is acquired and slopes are acquired from the waviness at an interval of 50 to 100 μm, the substrate being used in a magnetic disk on which recording or reading is performed using a DFH head, an average value of absolute values of the slopes is 0.45×10−4 or less. This magnetic-disk substrate is used in a magnetic disk and a magnetic-disk drive device.

公开(公告)号：US20170327930A1

公开(公告)日：2017-11-16

申请号：US15522921

申请日：2015-10-30

申请人： UACJ CORPORATION ,  FURUKAWA ELECTRIC CO., LTD.

发明人： Kotaro Kitawaki ,  Akira Hibino ,  Wataru Kumagai ,  Mitsuo Masuda ,  Sadayuki Toda

IPC分类号： C22C21/02 ,  G11B5/73 ,  C22C21/06 ,  C22F1/043

CPC分类号： C22C21/02 ,  C22C21/00 ,  C22C21/06 ,  C22F1/04 ,  C22F1/043 ,  G11B5/73 ,  G11B5/7315 ,  G11B5/733

摘要： An aluminum alloy substrate for a magnetic disk includes 0.5 mass % or more and 24.0 mass % or less of Si, 0.01 mass % or more and 3.00 mass % or less of Fe, and the balance of Al and unavoidable impurities. The aluminum alloy substrate for a magnetic disk includes a smooth plated surface and has high rigidity.

公开(公告)号：US20170301366A1

公开(公告)日：2017-10-19

申请号：US15634671

申请日：2017-06-27

申请人： National University of Singapore

发明人： Jingsheng Chen ,  Kaifeng Dong ,  Ganping Ju ,  Yingguo Peng

IPC分类号： G11B5/65 ,  G11B5/851 ,  G11B5/738

CPC分类号： G11B5/653 ,  C23C14/024 ,  C23C14/185 ,  C23C14/3464 ,  C23C14/352 ,  C30B23/00 ,  C30B29/16 ,  C30B29/52 ,  G11B5/65 ,  G11B5/73 ,  G11B5/7325 ,  G11B5/851

摘要： A stack includes a substrate, a magnetic recording layer having a columnar structure, and an interlayer disposed between the substrate and the magnetic recording layer. The columnar structure includes magnetic grains separated by a crystalline segregant or a combination of crystalline and amorphous segregants.

公开(公告)号：US09275669B1

公开(公告)日：2016-03-01

申请号：US14675588

申请日：2015-03-31

申请人： WD Media, LLC

发明人： Emad Girgis ,  Prakash Mani ,  Cristian Papusoi ,  Mrugesh Desai ,  Ramamurthy Acharya

IPC分类号： G11B5/73 ,  G11B5/66

CPC分类号： G11B5/66 ,  G11B5/73

摘要： The present disclosure generally relates to a PMR media for use in a HDD. The PMR media has an amorphous ferri-magnetic material layer disposed within the capping structure. The amorphous ferri-magnetic material layer reduces the noise. The amorphous ferri-magnetic material layer may be disposed between capping layer or on top of the capping layers. Additionally, the amorphous ferri-magnetic material layer may contain Tb.

摘要翻译： 本公开一般涉及用于HDD中的PMR介质。 PMR介质具有设置在封盖结构内的非晶铁磁材料层。 非晶铁磁材料层降低了噪音。 非晶铁磁材料层可以设置在封盖层之间或盖层上。 另外，非晶铁磁性材料层可以含有Tb。

公开(公告)号：US08852764B2

公开(公告)日：2014-10-07

申请号：US13551940

申请日：2012-07-18

申请人： Toshitaka Yagi ,  Naoyuki Goto

发明人： Toshitaka Yagi ,  Naoyuki Goto

IPC分类号： G11B5/73 ,  C03C3/095 ,  C03C3/097 ,  C03C3/091 ,  C03C3/093 ,  C03C21/00 ,  G11B5/84 ,  C03C10/00

CPC分类号： C03C10/00 ,  C03C3/095 ,  C03C3/097 ,  C03C21/002 ,  C03C2204/08 ,  G11B5/73 ,  G11B5/7315 ,  G11B5/8404

摘要： To provide a substrate for information recording medium having various properties, in particular higher fracture toughness, required for application of the substrate for information recording medium of the next generation such as perpendicular magnetic recording system, etc. and a material with excellent workability for such purpose. A crystallized glass substrate for information recording medium, consisting of a crystallized glass which comprises one or more selected from RAl2O4 and R2TiO4 as a main crystal phase, in which R is one or more selected from Zn, Mg and Fe, and in which the main crystal phase has a crystal grain size in a range of from 0.5 nm to 20 nm, a degree of crystallinity of 15% or less, and a specific gravity of 3.00 or less.

摘要翻译： 为了提供用于信息记录介质的基板，其具有用于施加下一代信息记录介质的基板（诸如垂直磁记录系统等）所需的各种性能，特别是较高的断裂韧性，以及具有优异的可加工性的材料用于该目的 。 一种用于信息记录介质的结晶玻璃基板，由包含选自由Zr，Mg和Fe中的一种或多种选自Zn，Mg和Fe中的一种或多种的主要结晶相的一种或多种的结晶玻璃组成，其中主要 晶相的晶粒尺寸为0.5nm〜20nm，结晶度为15％以下，比重为3.00以下。

公开(公告)号：US08722215B2

公开(公告)日：2014-05-13

申请号：US13003658

申请日：2009-07-03

申请人： Hideki Kawai

发明人： Hideki Kawai

IPC分类号： G11B7/252 ,  C03C3/095 ,  C03C14/00 ,  C03C4/00 ,  G11B5/73

CPC分类号： C03C14/00 ,  C03C3/083 ,  C03C3/095 ,  C03C3/097 ,  C03C4/00 ,  G11B5/73 ,  G11B5/7315 ,  Y10T428/315

摘要： A glass substrate for information recording medium, said glass substrate being composed of an alminosilicate glass containing 60-75% by mass of SiO2, 5-18% by mass of Al2O3, 3-10% by mass of Li2O, 3-15% by mass of Na2O and 0.5-8% by mass of ZrO2 relative to the entire glass components. The glass substrate for information recording medium contains neither As (arsenic) nor Sb (antimony), while containing at least one polyvalent element selected from the group consisting of V (vanadium), Mn (manganese), Ni (nickel), Nb (niobium), Mo (molybdenum), Sn (tin), Ce (cerium), Ta (tantalum) and Bi (bismuth). The molar ratio of the total amount of the polyvalent elements to the amount of ZrO2 is within the range of 0.05-0.50.

摘要翻译： 一种用于信息记录介质的玻璃基板，所述玻璃基板由含有60-75质量％SiO 2，5-18质量％Al 2 O 3，3-10质量％Li 2 O，3-15％ 质量的Na 2 O和0.5〜8质量％的ZrO 2相对于整个玻璃组分。 用于信息记录介质的玻璃基板既不包含As（砷）也不含Sb（锑），同时含有选自V（钒），Mn（锰），Ni（镍），Nb（铌）中的至少一种多价元素 ），Mo（钼），Sn（锡），Ce（铈），Ta（钽）和Bi（铋）。 多价元素的总量与ZrO 2的摩尔比在0.05〜0.50的范围内。