公开(公告)号：US20050227122A1

公开(公告)日：2005-10-13

申请号：US10511584

申请日：2003-03-20

Applicant: Migaku Takahashi ,  David Djayaprawira ,  Hirold Domon

Inventor： Migaku Takahashi ,  David Djayaprawira ,  Hirold Domon

IPC: C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/673 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  H01F10/16

CPC classification number: G11B5/7325 ,  G11B5/66 ,  G11B5/7379

Abstract: A vertical magnetic recording medium exhibiting excellent noise characteristics in which magnetic interaction is reduced in a magnetic layer. The vertical magnetic recording medium (10) includes a nonmagnetic substrate (1), an underlying layer (2) formed directly or indirectly on the nonmagnetic substrate (1), and a magnetic layer (4) for recording magnetic information formed on the underlying layer (2), characterized in that the underlying layer (2) is composed of an alloy principally including two kinds of element, difference of standard free energy ΔG° for producing an oxide or a nitride of the both elements at room temperature is set not lower than 70 kJ/mol[O2 or N2], and crystal grains constituting the underlying layer (2) principally includes one of two elements having a higher ΔG°, and the grain boundary of the underlying layer (2) principally includes an oxide or a nitride of an element having a lower ΔG°.

Abstract translation: 具有优异的噪声特性的垂直磁记录介质，其磁性层中的磁相互作用减小。 垂直磁记录介质（10）包括非磁性衬底（1），直接或间接形成在非磁性衬底（1）上的下层（2）和用于记录形成在下层上的磁信息的磁性层（4） （2），其特征在于，下层（2）由主要包含两种元素的合金构成，室温下用于制造两种元素的氧化物或氮化物的标准自由能差ΔG°的差设定为不低 构成下层（2）的晶粒主要包括具有较高ΔG°的两个元素中的一个，并且下层（2）的晶界主要包括氧化物或 具有较低DeltaG°的元素的氮化物。

公开(公告)号：US06878459B2

公开(公告)日：2005-04-12

申请号：US10026709

申请日：2001-12-27

Applicant: Migaku Takahashi ,  David Djayaprawira ,  Kazuya Komiyama ,  Satoru Yoshimura

Inventor： Migaku Takahashi ,  David Djayaprawira ,  Kazuya Komiyama ,  Satoru Yoshimura

IPC: C23C14/14 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  G11B5/851 ,  G11B5/66

CPC classification number: G11B5/7325 ,  G11B5/656 ,  Y10T428/12639 ,  Y10T428/12833 ,  Y10T428/12847 ,  Y10T428/12861 ,  Y10T428/12986 ,  Y10T428/24967 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31

Abstract: A magnetic recording medium was a high normalized coercive force and superior thermal stability. The magnetic recording medium comprises a non-magnetic base material, and a ferromagnetic metal layer of cobalt based alloy formed on top of this base material with a metal underlayer disposed therebetween, and displays a coercive force Hc of at least 2000 (Oe) and an anisotropic magnetic field Hkgrain of at least 10,000 (Oe). Furthermore, magnetic recording media in which the aforementioned metal underlayer and/or the ferromagnetic metal layer are fabricated in a film fabrication chamber with an ultimate vacuum at the 10−9 Torr level are preferred. A magnetic recording medium according to the present invention can be ideally applied to hard disks, floppy disks, and magnetic tapes and the like.

Abstract translation: 磁记录介质是高归一化矫顽力和优异的热稳定性。 磁记录介质包括非磁性基材，以及形成在该基材顶部上的钴基合金的强磁性金属层，其间设置有金属底层，并显示出至少2000（Oe）的矫顽力Hc和 至少10,000（Oe）的各向异性磁场Hk <颗粒>。 此外，优选在具有10 -9乇级别的极限真空的膜制造室中制造上述金属底层和/或强磁性金属层的磁记录介质。 根据本发明的磁记录介质可以理想地应用于硬盘，软盘和磁带等。

公开(公告)号：US06841259B1

公开(公告)日：2005-01-11

申请号：US09720736

申请日：2000-11-20

Applicant: Migaku Takahashi ,  David Djayaprawira ,  Hiroki Shoji

Inventor： Migaku Takahashi ,  David Djayaprawira ,  Hiroki Shoji

IPC: G11B5/00 ,  G11B5/127 ,  G11B5/31 ,  G11B5/39 ,  G11B5/66 ,  G11B5/667 ,  G11B5/73 ,  H01F10/14 ,  H01F10/18 ,  H01F10/32 ,  H01F17/00 ,  H01P3/08 ,  B32B15/04 ,  H01R10/10 ,  H01R10/14

CPC classification number: H01P3/088 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/00 ,  G11B5/1278 ,  G11B5/3109 ,  G11B5/3143 ,  G11B5/3909 ,  G11B5/3967 ,  G11B5/66 ,  G11B5/7325 ,  G11B2005/0002 ,  G11B2005/3996 ,  H01F10/14 ,  H01F10/18 ,  H01F10/3222 ,  H01F10/324 ,  H01F10/3286 ,  H01F17/0033 ,  Y10T428/115

Abstract: A magnetic thin film with a saturation magnetic flux density of 2 T or more and a coercive force of 2 Oe or less for a magnetic pole material of a recording head. The magnetic thin film consists of an iron carbide film that includes a martensite (α′) phase as the principal phase and at least carbon and iron as constituent elements. The iron carbide film preferably consists of a single α′ phase. The iron carbide film has a body-centered tetragonal structure and a c-axis constitutes an axis of hard magnetization and, a c-plane constitutes a plane of easy magnetization. The axis of hard magnetization constitutes a direction which is generally perpendicular to the film surface, and the plane of easy magnetization constitutes a direction which is generally parallel to the film surface.

Abstract translation: 对于记录头的磁极材料，具有2T以上的饱和磁通密度和2Oe以下的矫顽力的磁性薄膜。 磁性薄膜由包含马氏体（α'）相作为主相的碳化铁膜和至少碳和铁作为组成元素组成。 碳化铁膜优选由单个α'相组成。 碳化铁膜具有体心四方结构，c轴构成硬磁化轴，c面构成容易磁化的平面。 硬磁化轴构成大致垂直于膜表面的方向，容易磁化的平面构成大致平行于膜表面的方向。

公开(公告)号：US20050214584A1

公开(公告)日：2005-09-29

申请号：US10509616

申请日：2003-03-20

Applicant: Migaku Takahashi ,  David Djayaprawira ,  Hiroki Domon ,  Satoru Yoshimura

Inventor： Migaku Takahashi ,  David Djayaprawira ,  Hiroki Domon ,  Satoru Yoshimura

IPC: G11B5/64 ,  G11B5/66 ,  G11B5/673 ,  G11B5/738 ,  G11B5/84 ,  G11B5/851 ,  B05D5/12

CPC classification number: G11B5/851 ,  G11B5/66

Abstract: A method for producing a magnetic recording medium having a flat surface and a strong exchange bias field, and excellent in thermal stability. The method for producing a magnetic recording medium related to the present invention comprising a nonmagnetic substrate 1, a metal underlayer 2, and a ferromagnetic metal layer 3 formed successively in multilayer. The method comprises a step of forming the ferromagnetic layer 3 where ferromagnetic films 3a, 3b and one or more nonmagnetic metal spacer layer 4 are alternately formed in a multilayer and a step of allowing at least the interface of the nonmagnetic metal spacer layers 4 to physically adsorb oxygen and/or nitrogen.

Abstract translation: 一种具有平坦表面和强交换偏磁场的磁记录介质的制造方法，其热稳定性优异。 本发明涉及的磁记录介质的制造方法，其特征在于，包括依次层叠形成的非磁性基板1，金属底层2和强磁性金属层3。 该方法包括形成强磁性层3的步骤，其中铁磁膜3a，3b和一个或多个非磁性金属间隔层4在多层中交替形成，并且至少允许非磁性金属间隔层4的界面 物理吸附氧气和/或氮气。

公开(公告)号：US06709775B1

公开(公告)日：2004-03-23

申请号：US09979851

申请日：2001-11-28

Applicant: Migaku Takahashi ,  Satoru Yoshimura ,  David Djayaprawira ,  Hiroki Shoji

Inventor： Migaku Takahashi ,  Satoru Yoshimura ,  David Djayaprawira ,  Hiroki Shoji

IPC: G11B566

CPC classification number: G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

Abstract: A magnetic recording medium capable of suppressing the effects of thermal agitation and simultaneously reducing the average grain diameter and the standard deviation of magnetic crystal grains constituting a ferromagnetic metal film, without changing the film thickness of a metal under-layer or the film thickness of a ferromagnetic metal layer forming a recording layer, as well as a production method thereof, and a magnetic recording device. The magnetic recording medium includes a ferromagnetic metal layer of a cobalt based alloy formed on a base material with a metal underlayer having chromium as a major constituent disposed there between, wherein a seed layer having at least tungsten is provided between the base material and the metal under-layer, and the seed layer is an islands type film.

Abstract translation: 一种能够抑制热搅拌的影响并同时降低构成铁磁性金属膜的磁性晶粒的平均粒径和标准偏差的磁记录介质，而不改变金属底层的膜厚度或膜厚度 形成记录层的铁磁性金属层及其制造方法以及磁记录装置。 磁记录介质包括在基材上形成的钴基合金的强磁性金属层，其中具有设置在其间的主要成分为铬的金属底层，其中至少具有钨的种子层设置在基材和金属之间 底层，种子层是岛状膜。

公开(公告)号：US20050158585A1

公开(公告)日：2005-07-21

申请号：US10509244

申请日：2003-03-20

Applicant: Migaku Takahashi ,  Shin Saito ,  David Djayaprawira

Inventor： Migaku Takahashi ,  Shin Saito ,  David Djayaprawira

IPC: B32B15/01 ,  C22C38/02 ,  C22C38/06 ,  C23C28/00 ,  G11B5/66 ,  G11B5/667 ,  G11B5/73 ,  G11B5/84 ,  G11B5/851 ,  H01F10/14 ,  H01F41/14 ,  B05D5/12

CPC classification number: C22C38/02 ,  B32B15/01 ,  C22C38/06 ,  C23C28/321 ,  C23C28/34 ,  C23C28/343 ,  C23C28/347 ,  G11B5/66 ,  G11B5/667 ,  G11B5/8404 ,  G11B5/851 ,  Y10T428/265

Abstract: A vertical magnetic recording medium has a low-noise characteristic compared to media of a permalloy or sendust crystalline material, including a high-flatness soft magnetic backing layer, and enabling recording/reproduction of information at high recording density, a magnetic recorder provided with the vertical magnetic recording medium, a vertical magnetic recording medium manufacturing method and apparatus. The vertical magnetic recording medium has a multilayer structure on a substrate, in which a soft magnetic backing layer, a vertical recording layer of a ferromagnetic body, and a protective layer are formed. The soft magnetic backing layer is formed of an FeSiAlN film of a soft magnetic material. The atom % of each element of Fe, Si, Al, and N of the FeSiAlN film can be changed by changing the flow rate of N2 gas in a mixture gas of N2 gas and Ar gas introduced into the chamber.

Abstract translation: 垂直磁记录介质与坡莫合金或铁硅铝结晶材料的介质相比具有低噪声特性，包括高平坦度软磁背衬层，并且能够以高记录密度记录/再现信息，磁记录器具有 垂直磁记录介质，垂直磁记录介质制造方法和装置。 垂直磁记录介质在其上形成软磁背衬层，铁磁体垂直记录层和保护层的基板上具有多层结构。 软磁背衬层由软磁材料的FeSiAlN膜形成。 FeSiAlN膜的Fe，Si，Al和N的各元素的原子％可以通过改变引入到室中的N 2气体和Ar气体的混合气体中的N 2气体的流量来改变。

公开(公告)号：US20080055793A1

公开(公告)日：2008-03-06

申请号：US11876916

申请日：2007-10-23

Applicant: David Djayaprawira ,  Koji Tsunekawa ,  Motonobu Nagai ,  Hiroki Maehara ,  Shinji Yamagata ,  Naoki Watanabe ,  Shinji Yuasa

Inventor： David Djayaprawira ,  Koji Tsunekawa ,  Motonobu Nagai ,  Hiroki Maehara ,  Shinji Yamagata ,  Naoki Watanabe ,  Shinji Yuasa

IPC: G11B5/33

CPC classification number: H01L43/12 ,  B82Y25/00 ,  B82Y40/00 ,  C23C14/081 ,  C23C14/34 ,  G11C11/16 ,  G11C11/161 ,  H01F10/3204 ,  H01F10/3254 ,  H01F41/18 ,  H01F41/307 ,  H01L43/08

Abstract: A magnetoresistance effect device including a multilayer structure having a pair of ferromagnetic layers and a barrier layer positioned between them, wherein at least one ferromagnetic layer has at least the part contacting the barrier layer made amorphous and the barrier layer is an MgO layer having a highly oriented texture structure.

Abstract translation: 一种磁电阻效应器件，包括具有一对铁磁层和位于它们之间的阻挡层的多层结构，其中至少一个铁磁层至少具有与阻挡层接触的部分为非晶形，阻挡层是具有高度磁化强度的MgO层 定向纹理结构。

公开(公告)号：US08174800B2

公开(公告)日：2012-05-08

申请号：US12114468

申请日：2008-05-02

Applicant: Koji Tsunekawa ,  David Djayaprawira

Inventor： Koji Tsunekawa ,  David Djayaprawira

IPC: G11B5/39

CPC classification number: G01R33/093 ,  B82Y10/00 ,  B82Y25/00 ,  B82Y40/00 ,  C23C14/568 ,  G11B5/3909 ,  G11B5/3932 ,  G11B2005/3996 ,  H01F10/3254 ,  H01F10/3272 ,  H01F41/302

Abstract: A magnetoresistive element includes an antiferromagnetic layer formed from a layer containing manganese, a layered magnetization fixed layer which includes a first magnetization fixed layer located over a side of the antiferromagnetic layer and formed from a layer containing a ferromagnetic material and a platinum group metal, a second magnetization fixed layer formed from a layer containing a ferromagnetic material, and a first nonmagnetic intermediate layer located between the first magnetization fixed layer and the second magnetization fixed layer, a magnetic free layer formed from a layer containing a ferromagnetic material, and a second nonmagnetic intermediate layer located between the layered magnetization fixed layer and the magnetic free layer.

Abstract translation: 磁阻元件包括由包含锰的层形成的反铁磁层，层状磁化固定层，其包括位于反铁磁性层的一侧上并由含有铁磁材料和铂族金属的层形成的第一磁化固定层， 由含有铁磁材料的层形成的第二磁化固定层和位于第一磁化固定层和第二磁化固定层之间的第一非磁性中间层，由含有铁磁材料的层形成的无磁性层和第二非磁性层 位于层状磁化固定层和无磁性层之间的中间层。

公开(公告)号：US20070169699A1

公开(公告)日：2007-07-26

申请号：US11688739

申请日：2007-03-20

Applicant: David Djayaprawira ,  Koji Tsunekawa ,  Motonobu Nagai

Inventor： David Djayaprawira ,  Koji Tsunekawa ,  Motonobu Nagai

IPC: C23C16/00 ,  G11B5/127

CPC classification number: B82Y25/00 ,  B82Y40/00 ,  G01R33/093 ,  G11B5/39 ,  G11C11/16 ,  H01F10/30 ,  H01F10/3254 ,  H01F10/3268 ,  H01F41/18 ,  H01F41/302 ,  H01L43/12 ,  Y10T29/49025 ,  Y10T29/49032 ,  Y10T29/49034 ,  Y10T29/49043 ,  Y10T29/49044

Abstract: This application discloses a method and apparatus for manufacturing a magnetoresistive multilayer film having a structure where an antiferromagnetic layer, a pinned-magnetization layer, a nonmagnetic spacer layer and a free-magnetization layer are laminated on a substrate in this order. A film for the antiferromagnetic layer is deposited by sputtering as oxygen gas is added to a gas for the sputtering. A film for an extra layer interposed between the substrate and the antiferromagnetic layer is deposited by sputtering as oxygen gas is added to a gas for the sputtering. The film for the antiferromagnetic layer is deposited by sputtering as a gas mixture of argon and another gas of larger atomic number than argon is used.

Abstract translation: 本申请公开了一种用于制造具有这样的结构的磁阻多层膜的方法和装置，其中反铁磁性层，钉扎磁化层，非磁性间隔层和自由磁化层依次层压在基板上。 用于溅射的气体中加入氧气，通过溅射沉积反铁磁层的膜。 当用于溅射的气体中加入氧气时，通过溅射沉积介于衬底和反铁磁性层之间的额外层的膜。 用于反铁磁层的膜通过溅射沉积为氩气的气体混合物，并且使用比氩气更大原子序数的另一种气体。

公开(公告)号：US20070070553A1

公开(公告)日：2007-03-29

申请号：US11527532

申请日：2006-09-27

Applicant: Koji Tsunekawa ,  David Djayaprawira

Inventor： Koji Tsunekawa ,  David Djayaprawira

IPC: G11B5/33

CPC classification number: G01R33/093 ,  B82Y25/00 ,  G11B5/3906 ,  G11C11/161

Abstract: A magnetoresistance effect device has a fixed ferromagnetism layer, a free ferromagnetism layer, and a barrier layer sandwiched by these ferromagnetic layers. It is constituted so that CoFeB whose amount of addition of boron B (b: atomic %) is 21%≦b≦23% may be used for the free ferromagnetism layer. In the magnetic resistance effect element, a magnetostrictive constant does not change steeply near the magnetostrictive constant zero. A MR ratio is maintained to be high.

Abstract translation: 磁阻效应器件具有固定的铁磁层，自由铁磁层和被这些铁磁层夹在中间的阻挡层。 其构成为使得硼B（b：原子％）的添加量为21％<= b <= 23％的CoFeB可用于游离铁磁层。 在磁阻效应元件中，磁致伸缩常数在磁致伸缩常数零点附近不会急剧变化。 MR比保持较高。