公开(公告)号：US09934801B1

公开(公告)日：2018-04-03

申请号：US15620550

申请日：2017-06-12

申请人： Seagate Technology LLC

发明人： James Gary Wessel ,  Chen Wang ,  Chubing Peng

IPC分类号： G11B11/00 ,  G11B5/48 ,  G11B5/00 ,  G11B7/1263 ,  G11B11/105 ,  G11B7/126 ,  G11B5/60

CPC分类号： G11B5/6088 ,  G11B5/314 ,  G11B5/607 ,  G11B7/126 ,  G11B7/1263 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

摘要： An apparatus comprises a slider having an air bearing surface and is configured for heat-assisted magnetic recording. The slider comprises a write pole, a near-field transducer (NFT) proximate the write pole, and an optical waveguide configured to receive light from a light source and couple the light to the NFT. The optical waveguide comprises first and second opposing major surfaces and opposing first and second edges connected to the first and second major surfaces. An optically opaque overlay is disposed on or adjacent one or both of the first and second major surfaces of the optical waveguide. Periodic structures are disposed on a surface of the optically opaque overlay facing the waveguide. The periodic structures are configured to organize stray light emanating from the waveguide for absorption by the optically opaque overlay.

公开(公告)号：US09934800B1

公开(公告)日：2018-04-03

申请号：US15435583

申请日：2017-02-17

申请人： Seagate Technology LLC

发明人： Andres David Barbosa Neira ,  Roberto Fernandez Garcia ,  Michael James Hardy ,  Mark Anthony Gubbins ,  Martin Giles Blaber

IPC分类号： G11B11/00 ,  G11B5/48 ,  G11B5/00 ,  G11B5/60 ,  G11B11/105 ,  G11B7/126

CPC分类号： G11B5/6088 ,  G11B5/314 ,  G11B7/126 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

摘要： A waveguide has a first cladding layer surrounding a near-field transducer. A core of the waveguide is disposed on the first cladding layer, and a second cladding layer is disposed on the core opposite the first cladding layer. A coupler is formed of a second plasmonic material and disposed in the waveguide such that a first edge of the coupler is proximate a media-facing surface and a first side of the coupler faces and is spaced apart from a peg of the near-field transducer in a downtrack direction.

公开(公告)号：US09607649B1

公开(公告)日：2017-03-28

申请号：US15093882

申请日：2016-04-08

申请人： Seagate Technology LLC

发明人： Jason Riddering ,  Huazhou Lou

IPC分类号： G11B11/00 ,  G11B7/1267 ,  G11B5/09 ,  G11B5/00 ,  G11B7/1263 ,  G11B11/105 ,  G11B7/126

CPC分类号： G11B5/607 ,  G11B5/455 ,  G11B5/5534 ,  G11B7/126 ,  G11B7/1263 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

摘要： A test involves iterations over a series of laser powers of a heat-assisted read/write head. The iterations involve writing to a recording medium at the selected laser power for a sufficient duration to ensure thermal equilibrium of the read/write head at an end of the write. A clearance-control heater of the read/write head is transitioned from a pre-write power before a start of the write to a steady-state write power. The iterations further involve measuring a temperature of the read/write head during the write and adjusting the steady-state write power to achieve a predefined difference between the temperature at the start of the write and the end of the write. The adjusted steady state write power is stored for each iteration. A write-induced protrusion is determined based on the iterations and used for calibration of the read/write head.

公开(公告)号：US06646968B1

公开(公告)日：2003-11-11

申请号：US09606019

申请日：2000-06-29

申请人： Yasuyuki Miyaoka

发明人： Yasuyuki Miyaoka

IPC分类号： G11B390

CPC分类号： G11B7/1267 ,  G11B7/00736 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10595

摘要： Disclosed herein is a testing process for recording for presetting optimum recording power for a domain wall displacement type magneto-optical medium, the process comprising the steps of: recording a first record pattern on an Nth track on the magneto-optical medium; separately recording a second record pattern on an (N−1)th track and an (N+1)th track adjacent to both sides of the Nth track with varied recording power; reproducing the Nth track to detect a change in the pulse width of a reproduction signal; detecting recording power, at which cross writing occurs, on the basis of the detected result; and presetting optimum recording power on the basis of the recording power at which cross writing occurs.

摘要翻译： 本文公开了一种记录用于域壁位移型磁光介质的最佳记录功率的测试过程，该方法包括以下步骤：在磁光介质上的第N个磁道上记录第一记录图案;分别记录 第（N-1）个轨道和与第N个轨道的两侧相邻的第（N + 1）个轨道的第二记录模式，记录功率变化;再现第N个磁道以检测再现信号的脉冲宽度的变化 根据检测结果检测发生交叉写入的记录功率; 并根据发生交叉写入的记录功率来选择最佳记录功率。

公开(公告)号：US06545954B2

公开(公告)日：2003-04-08

申请号：US10080549

申请日：2002-02-25

申请人： Hirofumi Sukeda ,  Hideki Saga

发明人： Hirofumi Sukeda ,  Hideki Saga

IPC分类号： G11B1100

CPC分类号： G11B7/1267 ,  G11B11/1051 ,  G11B11/10521 ,  G11B11/1053 ,  G11B11/10595 ,  G11B27/36 ,  G11B2220/2525

摘要： A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be overwritten and is suitable for the improvement of the bit density. For the purpose, bipolar magnetic domains having edges of positive and negative polarities with respect to the direction of movement of a light spot are formed and the recording condition is optimized. Normal recording is carried out on the basis of the result of the optimization of the recording condition.

公开(公告)号：US06477118B1

公开(公告)日：2002-11-05

申请号：US09449765

申请日：1999-11-26

申请人： Hiroyuki Awano ,  Masaki Sekine ,  Manabu Tani ,  Masafumi Yoshihiro ,  Hiroshi Ido

发明人： Hiroyuki Awano ,  Masaki Sekine ,  Manabu Tani ,  Masafumi Yoshihiro ,  Hiroshi Ido

IPC分类号： G11B1100

CPC分类号： G11B7/1387 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10534 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10591 ,  G11B2005/0021

摘要： Disclosed are a reproducing method and a reproducing apparatus capable of performing reproduction with a wide power margin, as well as a recording method and a recording apparatus preferably used for super high density recording. A recording and reproducing apparatus 101 principally comprises a magnetic field-applying unit, a laser beam-radiating section, and a signal processing system. A magnetic coil 29, which is provided for the magnetic field-applying unit, is arranged so that its axis of magnetic field generation 102 is oblique to a surface of an information-recording medium 100. A reproducing magnetic field is applied in an oblique direction to the surface of the information-recording medium 100 by using the magnetic coil 29 while radiating a reproducing light beam to the medium by using the laser beam-radiating section. Accordingly, the leak magnetic field in the in-plane direction from a recording magnetic domain in a recording layer is amplified. The inversion of magnetization in a reproducing layer tends to occur, and the reproducing power margin is widened. The recording and reproducing apparatus 101 is also capable of recording information. An extremely minute recording magnetic domain can be formed in the recording layer of the information-recording medium.

摘要翻译： 公开了能够以大的功率余量进行再现的再现方法和再现装置，以及优选用于超高密度记录的记录方法和记录装置。 记录和再现装置101主要包括磁场施加单元，激光束辐射部分和信号处理系统。 设置用于磁场施加单元的磁线圈29被布置成使得其磁场产生轴102倾斜于信息记录介质100的表面。再现磁场沿倾斜方向 通过使用电磁线圈29同时通过使用激光束辐射部分将再现光束照射到介质上而到信息记录介质100的表面。 因此，记录层中记录磁畴的面内方向的泄漏磁场被放大。 再现层中的磁化反转趋于发生，再现功率余量变大。 记录和再现装置101还能够记录信息。 可以在信息记录介质的记录层中形成极细的记录磁畴。

公开(公告)号：US06414912B1

公开(公告)日：2002-07-02

申请号：US09550601

申请日：2000-04-17

申请人： Hirofumi Sukeda ,  Hideki Saga

发明人： Hirofumi Sukeda ,  Hideki Saga

IPC分类号： G11B1700

CPC分类号： G11B7/1267 ,  G11B11/1051 ,  G11B11/10521 ,  G11B11/1053 ,  G11B11/10595 ,  G11B27/36 ,  G11B2220/2525

摘要： A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be overwritten and is suitable for the improvement of the bit density. For the purpose, bipolar magnetic domains having edges of positive and negative polarities with respect to the direction of movement of a light spot are formed and the recording condition is optimized. Normal recording is carried out on the basis of the result of the optimization of the recording condition.

摘要翻译： 建立了高速大容量文件系统，通过对光脉冲照射磁场调制磁光盘装置应用高度精确的磁畴宽度控制技术，可以改善磁道密度，可以进行覆盖，适用于改进 位密度。 为此目的，形成具有相对于光斑移动方向具有正极性和负极性边缘的双极性磁畴，并优化记录条件。 基于记录条件优化的结果进行正常记录。

公开(公告)号：US06243326B1

公开(公告)日：2001-06-05

申请号：US09101800

申请日：1998-10-19

申请人： Satoshi Sumi ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Kenji Tanase ,  Yoshiharu Uchihara ,  Kenji Torazawa ,  Seiji Murata

发明人： Satoshi Sumi ,  Yoshihisa Suzuki ,  Atsushi Yamaguchi ,  Kenji Tanase ,  Yoshiharu Uchihara ,  Kenji Torazawa ,  Seiji Murata

IPC分类号： G11B1100

CPC分类号： G11B11/1051 ,  G11B11/10508 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10586

摘要： A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer (6) on a recording layer (4) and still preferably has an intermediate layer (8) between a reproduction layer (3) and the recording layer (4). The recording/reproduction device includes a circuit (33) for pulsing a laser beam to be radiated to the magneto-optic disk and still preferably includes a polarization rotating unit (50) and a polarizing filter (51) for blocking only the center of the laser beam in reproduction. The heat emitting layer (6) diffusing any heat generated by the laser beam, and the discontinuously radiated laser beam allow small recording domain. The laser beam having its center blocked forms smaller main lobe due to diffraction effect.

摘要翻译： 磁光盘及其记录/再现装置采用光学超分辨率来增加记录容量。 更具体地，磁光盘在记录层（4）上具有发热层（6），并且还优选地在再现层（3）和记录层（4）之间具有中间层（8）。 记录/再现装置包括用于脉冲激光束以辐射到磁光盘的电路（33），并且还优选地包括偏振旋转单元（50）和偏振滤光器（51），用于仅阻挡 激光束在再现。 发热层（6）扩散由激光束产生的热量，不连续辐射的激光束允许小的记录域。 具有中心阻挡的激光束由于衍射效应而形成较小的主瓣。

公开(公告)号：US6125084A

公开(公告)日：2000-09-26

申请号：US11486

申请日：1998-02-04

申请人： Hirofumi Sukeda ,  Hideki Saga

发明人： Hirofumi Sukeda ,  Hideki Saga

IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B7/1267 ,  G11B11/1051 ,  G11B11/10517 ,  G11B11/1053 ,  G11B11/10563 ,  G11B11/10521 ,  G11B7/00456

摘要： A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be overwritten and is suitable for the improvement of the bit density. For the purpose, bipolar magnetic domains having edges of positive and negative polarities with respect to the direction of movement of a light spot are formed and the recording condition is optimized. Normal recording is carried out on the basis of the result of the optimization of the recording condition.

摘要翻译： PCT No.PCT / JP95 / 01585第 371日期：1998年2月4日 102（e）1998年2月4日PCT PCT 1995年8月9日PCT公布。 公开号WO97 / 06530 日期1997年2月20日内置高速大容量文件系统，通过对能够被覆盖的光脉冲照射磁场调制磁光盘装置应用高度精确的磁畴宽度控制技术来改善轨道密度，并且是 适合改善位密度。 为此，形成了具有相对于光斑移动方向具有正极性和负极性边缘的双极性磁畴，并优化了记录条件。 基于记录条件优化的结果进行正常记录。

公开(公告)号：US5331612A

公开(公告)日：1994-07-19

申请号：US922854

申请日：1992-07-31

申请人： Yoshiteru Murakami ,  Kenji Ohta ,  Akira Takahashi

发明人： Yoshiteru Murakami ,  Kenji Ohta ,  Akira Takahashi

IPC分类号： G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04

CPC分类号： G11B11/10521 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10528 ,  G11B11/1053 ,  G11B11/10595

摘要： A magneto-optical recording apparatus which records information through the processes of: first irradiating a light beam onto a magneto-optical recording medium having a recording film; and next applying an external magnetic field that is inverted in response to a recording signal onto the recording film while continuing the first process. In the above arrangement, the intensity of the light beam is dropped upon inversion of the external magnetic field so that information is not recorded. The intensity of the light beam is raised during non-inversion of the external magnetic field so that information is recorded. Further the magneto-optical recording apparatus is provided with a light intensity control device for varying the intensity of the light beam dependent of the lengths of recording bits so that the high-temperature area of the recording film is not widened. Since the width of the recording bits is uniformly maintained, the remaining of the recording bit after overwriting operation can be reduced; thus, the signal quality in reproduction can be enhanced.

摘要翻译： 一种磁光记录装置，其通过以下处理记录信息：首先将光束照射到具有记录膜的磁光记录介质上; 并且接着在继续进行第一处理的同时将响应于记录信号反转的外部磁场施加到记录膜上。 在上述布置中，光束的强度在外部磁场反转时下降，从而不记录信息。 在外部磁场的非反相期间，光束的强度升高，从而记录信息。 此外，磁光记录装置设置有光强度控制装置，用于根据记录位的长度改变光束的强度，使得记录膜的高温区域不会变宽。 由于记录位的宽度被均匀地保持，所以可以减少重写操作之后的记录位的剩余部分。 因此，可以提高再现中的信号质量。