公开(公告)号：US07470474B2

公开(公告)日：2008-12-30

申请号：US10552445

申请日：2004-04-07

申请人： Akira Sakawaki ,  Kenji Shimizu ,  Kazuo Kobayashi ,  Hiroshi Sakai ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Futoshi Nakamura

发明人： Akira Sakawaki ,  Kenji Shimizu ,  Kazuo Kobayashi ,  Hiroshi Sakai ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Futoshi Nakamura

IPC分类号： G11B5/66 ,  G11B5/673 ,  C23C16/40

CPC分类号： G11B5/656 ,  G11B5/65 ,  G11B5/66

摘要： A magnetic recording medium which is provided on a nonmagnetic substrate 1 with at least an orientation-controlling layer 3 for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer 4 having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate 1, and a protective layer 5 and characterized in that the perpendicularly magnetic layer 4 includes two or more magnetic layers, that at least one of the magnetic layers is a layer 4a having Co as a main component and containing Pt as well and containing an oxide and that at least another of the magnetic layers is a layer 4b having Co as a main component and containing Cr as well and containing no oxide.

摘要翻译： 一种磁性记录介质，其设置在至少具有用于控制直接形成的层的取向的取向控制层3的非磁性基板1上，具有相对于非磁性基板主要垂直取向的易磁化轴的垂直磁性层4 1和保护层5，其特征在于，垂直磁性层4包括两个或多个磁性层，至少一个磁性层是具有Co作为主要成分并且含有Pt并且含有氧化物的层4a 并且至少另一个磁性层是具有Co作为主要成分并且含有Cr并且不含氧化物的层4b。

公开(公告)号：US07289298B2

公开(公告)日：2007-10-30

申请号：US10793950

申请日：2004-03-08

申请人： Tomoyuki Maeda ,  Takashi Hikosaka ,  Futoshi Nakamura ,  Takeshi Iwasaki ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Takashi Hikosaka ,  Futoshi Nakamura ,  Takeshi Iwasaki ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/653 ,  G11B5/656

摘要： Disclosed is a magnetic recording medium which includes a substrate, an underlayer, and a perpendicular magnetic recording layer, and in which this perpendicular magnetic recording layer contains magnetic crystal grains and a matrix surrounding the magnetic crystal grains, and the matrix contains an element selected from Zn, Cd, Al, Ga, and In, and a component selected from P, As, Sb, S, Se, and Te.

摘要翻译： 公开了一种磁记录介质，其包括基板，底层和垂直磁记录层，并且其中该垂直磁记录层包含磁性晶粒和围绕磁性晶粒的基体，并且该基体包含选自以下的元素： Zn，Cd，Al，Ga和In以及选自P，As，Sb，S，Se和Te的成分。

公开(公告)号：US20070111035A1

公开(公告)日：2007-05-17

申请号：US11594769

申请日：2006-11-09

申请人： Kenji Shimizu ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

发明人： Kenji Shimizu ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/66

摘要： The present invention aims to provide a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device which can prevent spike noise and improve the error rate. The present invention provides a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device comprising at least one nonmagnetic substrate, a soft magnetic underlayer 2, an orientation control layer to control the orientation of the layer formed directly above the same, and a perpendicular magnetic layer having an axis of easy magnetization which is oriented mainly perpendicularly to the nonmagnetic substrate, and the soft magnetic underlayer 2 is formed with a multilayer structure having soft magnetic layers 21A and 21B, and one or more separation layers 22 interposed between the soft magnetic layers, and at least one of the soft magnetic layers 21A and 21B comprises a material with a structure having no magnetic domain walls.

摘要翻译： 本发明旨在提供一种磁记录介质及其制造方法，以及能够防止尖峰噪声并提高误码率的磁记录和再现装置。 本发明提供一种磁记录介质及其制造方法，以及包括至少一个非磁性基底，软磁性底层2，取向控制层以控制直接在其上形成的层的取向的磁记录和再现装置 以及具有主要垂直于非磁性基板取向的容易磁化轴的垂直磁性层，并且软磁性底层2形成有具有软磁性层21A和21B的多层结构，以及一个或多个 介于软磁性层之间的分离层22以及软磁性层21A和21B中的至少一个包括具有不具有磁畴壁的结构的材料。

公开(公告)号：US20070072012A1

公开(公告)日：2007-03-29

申请号：US10564316

申请日：2004-07-13

申请人： Futoshi Nakamura ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Kenji Shimizu ,  Hiroshi Sakai

发明人： Futoshi Nakamura ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Kenji Shimizu ,  Hiroshi Sakai

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/7379

摘要： To provide a magnetic recording medium having a magnetic recording layer consisting of fine crystal grains with improved orientation. The soft magnetic layer 3, the seed layer 4, the under layer 5 and the magnetic recording layer 7 are formed successively on the non-magnetic substrate 1, wherein the seed layer 4 is made of a material containing Ni, the under layer 5 has a grain isolation type structure in which grains made of a non-magnetic material are isolated in a non-magnetic matrix and the non-magnetic matrix is made of a material containing Y2O3. With this constitution, the under layer 5 has improved characteristics in terms of uniformity of grains, sharpness of grain boundary, fineness of the grains and crystal orientation, and therefore the magnetic recording layer 7 that is formed on the under layer also has improved characteristics in terms of uniformity of grains, sharpness of grain boundary, fineness of the grains and crystal orientation. As a result, medium noise and coercive force are improved, thus making high density recording possible.

摘要翻译： 提供一种具有由具有改进的取向的细晶粒构成的磁记录层的磁记录介质。 软磁性层3，种子层4，底层5和磁记录层7依次形成在非磁性基板1上，其中种子层4由含有Ni的材料制成，底层5具有 一种颗粒隔离型结构，其中由非磁性材料制成的颗粒在非磁性基质中分离，非磁性基质由含有Y 2 O 3的材料制成， / SUB>。 利用这种结构，底层5在晶粒均匀性，晶界锐度，晶粒细度和晶体取向方面具有改进的特性，因此形成在下层上的磁记录层7也具有改善的特性 晶粒均匀度，晶界锐度，晶粒细度和晶体取向等。 结果，中等噪声和矫顽力得到改善，从而使得高密度记录成为可能。

公开(公告)号：US07105239B2

公开(公告)日：2006-09-12

申请号：US10234856

申请日：2002-09-05

申请人： Soichi Oikawa ,  Takashi Hikosaka ,  Futoshi Nakamura ,  Takeshi Iwasaki ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

发明人： Soichi Oikawa ,  Takashi Hikosaka ,  Futoshi Nakamura ,  Takeshi Iwasaki ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/66

摘要： In a magnetic recording medium, a longitudinal hard magnetic layer, interlayer, longitudinal soft magnetic layer, and magnetic recording layer are multilayered on a substrate. The interlayer is one of a magnetic layer having saturation magnetization smaller than that of the longitudinal hard magnetic layer, a nonmagnetic layer mainly containing cobalt or ruthenium or having a thickness of 0.5 nm or less, and an oxide layer of the longitudinal hard magnetic layer.

公开(公告)号：US06723458B2

公开(公告)日：2004-04-20

申请号：US10218570

申请日：2002-08-15

申请人： Kenji Shimizu ,  Akira Sakawaki ,  Hui Yang ,  Hiro Mochizuki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

发明人： Kenji Shimizu ,  Akira Sakawaki ,  Hui Yang ,  Hiro Mochizuki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

IPC分类号： G11B566

CPC分类号： G11B5/667 ,  G11B5/656 ,  G11B5/7325 ,  Y10S428/90

摘要： A magnetic recording medium that is capable of recording and reading back information at a higher density by improving the read/write characteristics and thermal stability, a method of manufacture therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium, comprises an orientation control film that controls the orientation of a film provided directly thereabove, a perpendicular magnetic film, of which the axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on the non-magnetic substrate, wherein the perpendicular magnetic film is made of a material which contains Co, Cr, Pt and Cu, the Cr content being 16 at % to 24 at % and the Cu content being 0.1 at % to 4 at %, and a coercive force (Hc) of the perpendicular magnetic film being at least 3000 (Oe), negative nucleation field (−Hn) being 0 (Oe) to 2500 (Oe), and a ratio of residual magnetization (Mr) to saturation magnetization (Ms) being at least 0.85.

摘要翻译： 提供能够通过改善读/写特性和热稳定性而以更高密度记录和读回信息的磁记录介质，其制造方法和磁读/写装置。 这种磁记录介质包括控制直接在其上设置的膜的取向的取向控制膜，容易磁化轴垂直于非磁性基板的垂直磁性膜和保护膜，其中 设置在非磁性基板上，其中垂直磁性膜由含有Co，Cr，Pt和Cu的材料制成，Cr含量为16at％至24at％，Cu含量为0.1at％至4 （Oe），负成核场（-Hn）为0（Oe）〜2500（Oe），剩余磁化强度（Mr））为0以上，垂直磁性膜的矫顽力（Hc）为3000 饱和磁化强度（Ms）至少为0.85。

公开(公告)号：US06404748B1

公开(公告)日：2002-06-11

申请号：US09025440

申请日：1998-02-17

申请人： Futoshi Nakamura

发明人： Futoshi Nakamura

IPC分类号： H04J310

CPC分类号： H03K17/16 ,  H03K17/74 ,  H04B1/10

摘要： A receipt circuit for a TDMA (Time Division Multiple Access) radio apparatus of the present invention includes a switch selectively turned on or turned off in order to remove a residual signal component occurring in a guard time between consecutive time slots due to the group delay of a SAW (Surface Acoustic Wave) filter or a ceramic filter. The receipt circuit therefore obviates the fall of receipt sensitivity even when a TDMA signal of low level is input immediately after a slot in which a TDMA signal of high level has been input. In addition, the receipt circuit is free from the erroneous detection of an input electric field.

摘要翻译： 本发明的TDMA（时分多址）无线电设备的接收电路包括选择性地导通或关断的开关，以便消除由于组延迟引起的连续时隙之间的保护时间中出现的残留信号分量 SAW（表面声波）滤波器或陶瓷滤波器。 因此，即使在输入了高电平的TDMA信号的时隙之后立即输入低电平的TDMA信号，接收电路也避免了接收灵敏度的下降。 此外，接收电路没有输入电场的错误检测。

公开(公告)号：US20070065955A1

公开(公告)日：2007-03-22

申请号：US10574573

申请日：2004-10-05

申请人： Tomoyuki Maeda ,  Soichi Okawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Okawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/82 ,  H01L21/00

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/7325

摘要： A perpendicular magnetic recording medium includes: a substrate; at least one underlayer formed above the substrate; and a perpendicular magnetic recording layer formed above the at least one underlayer, an easy magnetization axis of the perpendicular magnetic recording layer being oriented perpendicular to the substrate, the perpendicular magnetic recording layer including magnetic crystal particles and grain boundaries surrounding the magnetic crystal particles, wherein the grain boundaries contain an oxide of silicon and at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Ca, Sr, and Ba, and the ratio of a total amount of substance of Si, Li, Na, K, Rb, Cs, Ca, Sr, and Ba in the perpendicular magnetic recording layer is no less than 1 mol % and no more than 20 mol %.

摘要翻译： 垂直磁记录介质包括：基板; 至少一个底层形成在所述基底上; 以及形成在所述至少一个底层上方的垂直磁记录层，所述垂直磁记录层的易磁化轴垂直于所述衬底取向，所述垂直磁记录层包括磁性结晶颗粒和包围所述磁性结晶颗粒的晶界，其中 晶界包含硅的氧化物和选自Li，Na，K，Rb，Cs，Ca，Sr和Ba中的至少一种元素，并且Si，Li， 垂直磁记录层中的Na，K，Rb，Cs，Ca，Sr和Ba不小于1mol％且不大于20mol％。

公开(公告)号：US20070042227A1

公开(公告)日：2007-02-22

申请号：US10572780

申请日：2004-09-22

申请人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

发明人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

摘要： To make possible high density recording by making the structure of the perpendicular magnetic recording layer finer. A perpendicular magnetic recording medium 10 includes at least a nonmagnetic under layer 2, a perpendicular magnetic layer 3, and a protective layer which are stacked on a nonmagnetic substrate 1, wherein the perpendicular magnetic layer includes ferromagnetic crystal grains and nonmagnetic crystal grain boundary regions, wherein the crystal grain boundary region includes at least two kinds of oxide.

摘要翻译： 通过使垂直磁记录层的结构更细，可以实现高密度记录。 垂直磁记录介质10至少包括层叠在非磁性基板1上的非磁性底层2，垂直磁性层3和保护层，其中垂直磁性层包括铁磁晶粒和非磁性晶粒边界区域， 其中所述晶界区包括至少两种氧化物。

公开(公告)号：US07166375B2

公开(公告)日：2007-01-23

申请号：US10029204

申请日：2001-12-28

申请人： Kenji Shimizu ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

发明人： Kenji Shimizu ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

IPC分类号： G11B5/667 ,  G11B5/673

CPC分类号： G11B5/667 ,  G11B5/66

摘要： A magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device are provided which can prevent spike noise and improve the error rate. The magnetic recording medium comprises at least one nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer to control the orientation of the layer formed directly above the same, and a perpendicular magnetic layer having an axis of easy magnetization which is oriented mainly perpendicularly to the nonmagnetic substrate. The soft magnetic underlayer is formed with a multilayer structure having at least two soft magnetic layers and one or more separation layers interposed between the soft magnetic layers, and at least one of the soft magnetic layers comprises a material with a structure having no magnetic domain walls.

摘要翻译： 提供了一种磁记录介质，其制造方法和磁记录和再现装置，其可以防止尖峰噪声并提高误码率。 磁记录介质包括至少一个非磁性衬底，软磁性底层，用于控制其正上方形成的层的取向的取向控制层以及具有易于磁化的轴的垂直磁性层，其主要垂直于 非磁性基板。 软磁性底层形成为具有至少两个软磁性层和插入在软磁性层之间的一个或多个分离层的多层结构，并且至少一个软磁性层包括具有不具有磁畴壁的结构的材料 。