公开(公告)号：US06834026B2

公开(公告)日：2004-12-21

申请号：US10626362

申请日：2003-07-23

Applicant: Eric E. Fullerton ,  Stefan Maat ,  Jan-Ulrich Thiele

Inventor： Eric E. Fullerton ,  Stefan Maat ,  Jan-Ulrich Thiele

IPC: G11B1100

CPC classification number: G11B5/66 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0021 ,  Y10T428/24802

Abstract: A magnetic recording medium for thermally-assisted recording is a bilayer of a high-coercivity, high-anisotropy ferromagnetic material like FePt and a switching material like FeRh or Fe(RhM) (where M is Ir, Pt, Ru, Re or Os) that exhibits a switch from antiferromagnetic to ferromagnetic at a transition temperature less than the Curie temperature of the high-coercivity material. The high-coercivity recording layer and the switching layer are exchange coupled ferromagnetically when the switching layer is in its ferromagnetic state. To write data the bilayer medium is heated above the transition temperature of the switching layer. When the switching layer becomes ferromagnetic, the total magnetization of the bilayer is increased, and consequently the switching field required to reverse a magnetized bit is decreased without lowering the anisotropy of the recording layer. The magnetic bit pattern is recorded in both the recording layer and the switching layer. When the media is cooled to below the transition temperature of the switching layer, the switching layer becomes antiferromagnetic and the bit pattern remains in the high-anisotropy recording layer.

Abstract translation: 用于热辅助记录的磁记录介质是诸如FePt的高矫顽力，高各向异性铁磁材料和诸如FeRh或Fe（RhM）（其中M是Ir，Pt，Ru，Re或Os）的开关材料的双层， 其在低于高矫顽力材料的居里温度的转变温度下表现出从反铁磁转变为铁磁。 当高矫顽力记录层和开关层在开关层处于其铁磁状态时，铁磁性交换耦合。 为了写入数据，双层介质被加热到开关层的转变温度之上。 当开关层成为铁磁性时，双层的总磁化强度增加，因此在不降低记录层的各向异性的情况下降低了使磁化位反转所需的切换场。 磁记录层记录在记录层和切换层中。 当介质冷却到切换层的转变温度以下时，开关层变为反铁磁性，并且位图形保留在高各向异性记录层中。

公开(公告)号：US06791908B2

公开(公告)日：2004-09-14

申请号：US10308791

申请日：2002-12-03

Applicant: Motoyoshi Murakami ,  Takeshi Sakaguchi ,  Yasumori Hino

Inventor： Motoyoshi Murakami ,  Takeshi Sakaguchi ,  Yasumori Hino

IPC: G11B1100

CPC classification number: G11B11/10578 ,  G11B11/10515 ,  G11B11/10582 ,  G11B11/10584 ,  G11B11/10586

Abstract: A magneto-optical recording medium, including a recording layer, a transfer control layer magnetically coupled to the recording layer, and a reproduction layer. The recording layer includes a recording magnetic domain in which information is recorded by a magnetization direction vertical to the surface of the film. The reproduction layer includes a reproduction magnetic domain in which information in the recording layer is transferred and formed as a magnetization direction by magnetic coupling. The direction of magnetization of the recording magnetic domain of the recording layer and the direction of magnetization of the transfer control layer corresponding to the recording magnetic domain are in opposite directions in at least part of the range of temperatures less than a transfer temperature where the reproduction magnetic domain is transferred to the reproduction layer. The Curie point temperature of the transfer control layer is higher than this transfer temperature.

Abstract translation: 包括记录层，磁耦合到记录层的转移控制层和再现层的磁光记录介质。 记录层包括通过垂直于胶片表面的磁化方向记录信息的记录磁畴。 再现层包括其中记录层中的信息通过磁耦合传送并形成为磁化方向的再现磁畴。 记录层的记录磁畴的磁化方向和与记录磁畴相对应的转印控制层的磁化方向在至少部分小于转印温度的范围内的方向上处于相反的方向 磁畴被传送到再现层。 转移控制层的居里点温度高于此转印温度。

公开(公告)号：US06788625B2

公开(公告)日：2004-09-07

申请号：US10436670

申请日：2003-05-13

Applicant: Yoshiyuki Nanba

Inventor： Yoshiyuki Nanba

IPC: G11B1100

CPC classification number: G11B20/1217 ,  G11B7/00 ,  G11B7/00745 ,  G11B20/1803 ,  G11B2020/1232 ,  G11B2020/1267 ,  G11B2020/1292 ,  G11B2220/2525

Abstract: A storage medium stores information on a plurality of tracks formed thereon, each of the tracks being divided into a plurality of sectors. The storage medium includes a physically formed sector beginning identifier provided at a leading portion of each sector, and an information storing portion. The information storing portion, another sector address portion at the trailing end of the information storing portion, includes at least one sector address portion at a leading end of the information storing portion, another sector address portion at the trailing end of the information storing portion, and a data portion provided between the two sector address portions.

Abstract translation: 存储介质存储关于其上形成的多个轨道的信息，每个轨道被划分成多个扇区。 存储介质包括设置在每个扇区的引导部分处的物理形成的扇区起始标识符和信息存储部分。 信息存储部分，在信息存储部分的尾端处的另一个扇区地址部分包括在信息存储部分的前端的至少一个扇区地址部分，在信息存储部分的后端的另一个扇区地址部分， 以及设置在两个扇区地址部分之间的数据部分。

公开(公告)号：US06765847B2

公开(公告)日：2004-07-20

申请号：US10125742

申请日：2002-04-18

Applicant: Masahiro Birukawa ,  Yasumori Hino ,  Yasushi Hozumi ,  Tomoyuki Hiroki

Inventor： Masahiro Birukawa ,  Yasumori Hino ,  Yasushi Hozumi ,  Tomoyuki Hiroki

IPC: G11B1100

CPC classification number: G11B11/10582 ,  G11B11/10578 ,  G11B11/10584

Abstract: On a disk-shaped substrate with pits and grooves, a first dielectric layer, a magnetic layer, and a second dielectric layer are formed. A data region used for recording/reproduction includes a plurality of tracks, and is divided into a plurality of segments. Each segment includes a pit region and a groove region. Recording/reproducing tracks are composed of the grooves. Magnetic anisotropy of a magnetic layer positioned on each of lands between the respective recording/reproducing tracks is reduced to a level lower than that of magnetic anisotropy of the magnetic layers positioned on the grooves, so that the recording/reproducing tracks are magnetically separated. On an inner side of an innermost recording/reproducing track and on an outer side of an outermost recording/reproducing track, at least one dummy track is provided, respectively.

Abstract translation: 在具有凹坑和凹槽的盘状基板上形成第一介电层，磁性层和第二介质层。 用于记录/再现的数据区包括多个轨道，并被分成多个段。 每个段包括凹坑区和凹槽区。 记录/再现轨道由凹槽组成。 位于相应的记录/再现轨道之间的每个区域上的磁性层的磁各向异性被降低到低于定位在凹槽上的磁性层的磁各向异性的水平，使得记录/再现轨迹被磁分离。 在最内记录/再现轨迹的内侧和最外侧记录/重放轨道的外侧上分别设置至少一个虚拟轨迹。

公开(公告)号：US06757221B1

公开(公告)日：2004-06-29

申请号：US09625654

申请日：2000-07-26

Applicant: Kazushi Uno ,  Shingo Hamaguchi ,  Kyoko Tadaki ,  Kiyoto Matsui ,  Goro Kawasaki ,  Nobuyuki Kanto

Inventor： Kazushi Uno ,  Shingo Hamaguchi ,  Kyoko Tadaki ,  Kiyoto Matsui ,  Goro Kawasaki ,  Nobuyuki Kanto

IPC: G11B1100

CPC classification number: G11B11/10554 ,  G11B5/17 ,  G11B11/10534 ,  G11B11/1058

Abstract: An optical head includes a lens carrier movable at least radially of a magneto-optical disk in facing relation thereto. An object lens is mounted on the lens carrier to converge a laser beam for forming a laser spot on the disk. The object lens has an optical axis and includes a lens surface directed toward the disk. A patterned coil is formed on the lens surface at least in one layer and has a light-passing opening corresponding to the optical axis of the object lens. A light-pervious layer is formed on the lens surface for closing the light-passing opening of the coil.

Abstract translation: 光学头包括透镜载体，该透镜载体可以至少径向地以与磁光盘相对的磁光盘径向移动。 物镜安装在透镜载体上以会聚用于在盘上形成激光斑的激光束。 物镜具有光轴并且包括朝向盘的透镜表面。 图案化的线圈至少在一个层上形成在透镜表面上，并且具有对应于物镜的光轴的光通过开口。 在透镜表面上形成透光层，用于封闭线圈的通光开口。

公开(公告)号：US06721238B2

公开(公告)日：2004-04-13

申请号：US09996418

申请日：2001-11-29

Applicant: Yasuhito Tanaka ,  Yoshihiro Muto

Inventor： Yasuhito Tanaka ,  Yoshihiro Muto

IPC: G11B1100

CPC classification number: G11B11/10586 ,  G11B11/10584 ,  Y10T428/1121

Abstract: A magneto-optical recording medium for recording and reproducing carriers by laser beam irradiation includes a first magnetic layer which is magnetized in the in-plane direction at room temperature and is perpendicularly magnetized at a predetermined temperature T1 or more; a second magnetic layer which is in contact with the first magnetic layer, has a Curie temperature Tc2 higher than the predetermined temperature T1, and has in-plane magnetic anisotropy up to the Curie temperature Tc2; a third magnetic layer which has a Curie temperature Tc3 higher than the predetermined temperature T1 and has perpendicular magnetic anisotropy at least in a predetermined range of a temperature distribution of the magneto-optical recording medium during laser beam irradiation when reproducing; and a rare earth metal layer formed between the third magnetic layer and the second magnetic layer.

Abstract translation: 用于通过激光束照射来记录和再现载体的磁光记录介质包括在室温下在面内方向被磁化并在预定温度T1或更高的温度下垂直磁化的第一磁性层; 与第一磁性层接触的第二磁性层具有高于预定温度T1的居里温度Tc2，具有高达居里温度Tc2的面内磁各向异性; 具有比预定温度T1高的居里温度Tc3的第三磁性层，并且在再现时在激光束照射期间至少在磁光记录介质的温度分布的预定范围内具有垂直的磁各向异性; 以及形成在第三磁性层和第二磁性层之间的稀土金属层。

公开(公告)号：US06707767B2

公开(公告)日：2004-03-16

申请号：US09982920

申请日：2001-10-22

Applicant: Tomoyuki Hiroki

Inventor： Tomoyuki Hiroki

IPC: G11B1100

CPC classification number: G11B11/10515 ,  G11B11/10593

Abstract: A magneto-optic recording medium in which information is reproduced while a recording magnetic domain is enlarged by displacing a domain wall based on a temperature distribution formed by a beam of light and having a maximum temperature Tr. The recording medium comprises a reproducing layer in which a domain wall is displaced, a recording layer for holding a recording magnetic domain corresponding to information, and a cutoff layer disposed between the reproducing layer and the recording layer and having a Curie temperature lower than those of the reproducing layer and recording layer. The recording medium satisfies the following condition; (Tr−RT)/(Tc2−RT)≧1.8 where Tc2: Curie temperature of the cutoff layer, and RT: room temperature.

Abstract translation: 一种磁光记录介质，其中通过基于由光束形成的具有最大温度Tr的温度分布来移位畴壁而在记录磁畴被放大的同时再现信息。 记录介质包括其中畴壁被移位的再现层，用于保持对应于信息的记录磁畴的记录层，以及设置在再现层和记录层之间的具有居里温度的居里温度 再现层和记录层。 记录介质满足以下条件：T c2：截止层的居里温度，RT：室温。

公开(公告)号：US06697304B2

公开(公告)日：2004-02-24

申请号：US10247691

申请日：2002-09-20

Applicant: Atsushi Yamaguchi ,  Naoyuki Takagi

Inventor： Atsushi Yamaguchi ,  Naoyuki Takagi

IPC: G11B1100

CPC classification number: G11B11/10528 ,  G11B11/10513 ,  G11B11/10515 ,  G11B20/1426

Abstract: A magneto-optical recording medium includes a recording layer and a reproducing layer respectively formed by magnetic layers on a substrate. A record magnetic domain is formed within the recording layer by using a magnetic head, which is transferred into a reproducing layer by irradiating a laser beam upon reproduction. The physical length in recording a unit bit is taken as a unit domain length. Where the unit domain length is 1T and “1” is recorded in 1T, “1” is recorded in a former half 1T/2 and “0” is in a latter half 1T/2 by applying one period of an alternating magnetic field to the unit domain length.

Abstract translation: 磁光记录介质包括分别由衬底上的磁性层形成的记录层和再现层。 通过使用磁头在记录层内形成记录磁畴，磁头通过在再现时照射激光而被转印到再现层中。 记录单位位的物理长度作为单位域长度。 在单位域长度为1T且在1T中记录为“1”的情况下，在前半部1T / 2中记录“1”，在后半部1T / 2中记录“0”，通过将一个交变磁场周期 单位域长度。

公开(公告)号：US06687197B1

公开(公告)日：2004-02-03

申请号：US09631371

申请日：2000-08-02

Applicant: Koji Matsumoto

Inventor： Koji Matsumoto

IPC: G11B1100

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/10 ,  G11B5/105 ,  G11B5/127 ,  G11B5/3103 ,  G11B5/3106 ,  G11B5/3133 ,  G11B5/40 ,  G11B5/65 ,  G11B5/7325 ,  G11B5/74 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  G11B2005/3996 ,  Y10T428/24355

Abstract: An information recording medium comprising an information recording film formed on a base on which regular depressions and projections having Ra of 0.1 to 1.5 nm have been formed, the information recording film containing as a major component a rare earth-transition metal amorphous alloy capable of magnetically reproducing a recorded information.

Abstract translation: 一种信息记录介质，包括形成在基底上的信息记录膜，其上形成了具有0.1至1.5nm的Ra的规则的凹凸和凸起，该信息记录膜含有作为主要成分的能够磁性的稀土 - 过渡金属非晶态合金 再现记录的信息。

公开(公告)号：US06674693B1

公开(公告)日：2004-01-06

申请号：US09506257

申请日：2000-02-17

Applicant: Hiroyuki Awano ,  Yuji Yamazaki ,  Masaki Sekine

Inventor： Hiroyuki Awano ,  Yuji Yamazaki ,  Masaki Sekine

IPC: G11B1100

CPC classification number: G11B11/10534 ,  G11B7/1387 ,  G11B11/10515 ,  G11B11/10541 ,  G11B11/10554 ,  G11B11/10573 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10595

Abstract: While a magneto-optical recording medium is irradiated with a laser beam, the medium is rotated relative to the beam at a controlled speed in such a manner that a high temperature region of a heat spot produced on the basis of the light intensity distribution of the beam is formed outside the associated light spot. A magnetic field source includes a magnetic field generator which is narrow in the direction along the track of the medium. The field source is positioned with the field generator at the heat center outside the light spot to apply a narrow recording magnetic field to the high temperature region. This forms a recording magnetic domain in the high temperature region. The magnetic domain is rectangular and narrow in the direction along the track. Rectangular recording magnetic domains adjoining in the direction along the track hardly interfere with each other even if they are closely spaced. This results in high density recording.

Abstract translation: 当用激光束照射磁光记录介质时，介质以受控的速度相对于光束转动，使得基于光束的光强度分布产生的热点的高温区域 光束形成在相关联的光斑之外。 磁场源包括在沿着介质轨道的方向上较窄的磁场发生器。 场源将场发生器定位在光点外的热中心处，以将高记录磁场施加到高温区域。 这在高温区域形成记录磁畴。 磁畴在沿着轨道的方向上是矩形的和窄的。 沿着轨道的方向邻接的矩形记录磁畴即使彼此紧密间隔也难以彼此干涉。 这导致高密度记录。