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公开(公告)号：US20080239533A1
公开(公告)日：2008-10-02
申请号：US12058740
申请日：2008-03-30
申请人： Makoto Nagao , Naoto Fujiwara , Tadashi Yasunaga , Ryuji Sugita , Takashi Komine
发明人： Makoto Nagao , Naoto Fujiwara , Tadashi Yasunaga , Ryuji Sugita , Takashi Komine
IPC分类号： G11B5/86
CPC分类号： G11B5/865
摘要： The present invention provides a method of magnetic transfer comprising: an initial magnetization step of performing an initial magnetization by applying a DC magnetic field perpendicular to a disk shaped perpendicular magnetic recording medium which is formed by laminating a soft magnetic layer and a magnetic layer on a substrate; an initial magnetization cleaning step of applying an in-plane magnetic field having an intensity larger than 100 [Oe] and less than an intensity of Hn, to the perpendicular magnetic recording medium after passed through the initial magnetization step in radial direction which directed from a center to an outer of the perpendicular magnetic recording medium. After or in a time of the magnetic transfer, a magnetic cleaning may be performed by applying an in-plane magnetic field having the same intensity as the initial magnetization cleaning step in radial direction instead of the initial magnetization cleaning or in combination.
摘要翻译： 本发明提供一种磁转移方法，包括：初始磁化步骤，通过施加垂直于盘形垂直磁记录介质的直流磁场来进行初始磁化，所述盘形垂直磁记录介质是通过在软磁层和磁性层上层压形成的 基质; 初始磁化清洁步骤，其在通过从径向方向引导的初始磁化步骤之后，向垂直磁记录介质施加强度大于100 [Oe]且小于Hn强度的面内磁场， 中心到垂直磁记录介质的外部。 在磁转移之后或之后，可以通过施加具有与初始磁化清洁步骤相同的强度的面内磁场而不是初始磁化清洁或组合来进行磁性清洁。
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2.发明授权公开(公告)号：US07522362B2
公开(公告)日：2009-04-21
申请号：US11185684
申请日：2005-07-21
申请人： Takashi Komine , Ryuji Sugita , Tadashi Yasunaga , Makoto Nagao
发明人： Takashi Komine , Ryuji Sugita , Tadashi Yasunaga , Makoto Nagao
CPC分类号： G11B5/865 , G11B5/59633
摘要： An amplitude servo pattern capable of providing accurate servo control through reproduced amplitude with reduced noise is provided. The amplitude servo pattern has servo burst signals composed of burst bit strings adjacently disposed in a track width direction. The burst bit strings are disposed such that the servo burst signals adjacently disposed in the track width direction have a phase difference with each other in a track direction.
摘要翻译： 提供能够通过具有降低的噪声的再现幅度提供精确的伺服控制的振幅伺服模式。 振幅伺服模式具有由相邻设置在轨道宽度方向上的突发位串组成的伺服脉冲串信号。 突发比特串被布置成使得在轨道宽度方向上相邻设置的伺服突发信号在轨道方向上具有彼此的相位差。
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公开(公告)号：US20060007569A1
公开(公告)日：2006-01-12
申请号：US11185684
申请日：2005-07-21
申请人： Takashi Komine , Ryuji Sugita , Tadashi Yasunaga , Makoto Nagao
发明人： Takashi Komine , Ryuji Sugita , Tadashi Yasunaga , Makoto Nagao
CPC分类号： G11B5/865 , G11B5/59633
摘要： An amplitude servo pattern capable of providing accurate servo control through reproduced amplitude with reduced noise is provided. The amplitude servo pattern has servo burst signals composed of burst bit strings adjacently disposed in a track width direction. The burst bit strings are disposed such that the servo burst signals adjacently disposed in the track width direction have a phase difference with each other in a track direction.
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4.发明申请Process for producing magnetic recording medium with limited coercivity squareness ratio 审中-公开具有有限矫顽力矩形度的磁记录介质的制造方法公开(公告)号：US20050277000A1
公开(公告)日：2005-12-15
申请号：US11152156
申请日：2005-06-15
申请人： Makoto Nagao , Ryuji Sugita , Tadashi Yasunaga
发明人： Makoto Nagao , Ryuji Sugita , Tadashi Yasunaga
摘要： A magnetic recording medium containing a magnetic recording layer with a coercivity squareness ratio of 0.4 to 0.9 is produced by magnetic transfer, for which a magnetic field is applied to an unrecorded magnetic recording medium while maintaining a patterned side of the patterned master medium in close contact with the magnetic recording layer for magnetic transfer. At least portions of the patterned side are made of a soft-magnetic material, and the pattern formed on the patterned side has a bit length of 60 nm or smaller. It is possible to arrange the magnetic recording layer to have a coercive force of 398 kA/m or greater, reduce the bit length to 55 nm or smaller, and heat the magnetic recording layer to 100° C. or higher during application of the magnetic field.
摘要翻译： 通过磁转移产生含有矫顽力矩形比为0.4〜0.9的磁记录层的磁记录介质，对未记录的磁记录介质施加磁场，同时保持图案化主介质的图案侧紧密接触 与磁记录层进行磁转移。 图案化侧的至少一部分由软磁性材料制成，并且在图案化侧上形成的图案具有60nm或更小的位长度。 可以使磁记录层具有398kA / m以上的矫顽力，将位长度减小到55nm以下，并且在施加磁性时将磁记录层加热到100℃以上 领域。
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公开(公告)号：US06887593B2
公开(公告)日：2005-05-03
申请号：US10661477
申请日：2003-09-15
CPC分类号： B82Y10/00 , G11B5/59633 , G11B5/743 , G11B5/865 , Y10T428/32 , Y10T428/325
摘要： A master information carrier for magnetic transfer includes a substrate having an irregularity pattern representing information to be transferred to a slave medium and a magnetic layer formed on the irregularity pattern on the substrate. The depth d of the recessed portions of the irregularity pattern and the thickness t of the magnetic layer formed on the recessed portions satisfy formula −0.004≦(t−d)/d≦0.1. At the same time, the magnetic layer formed on the protruding portion of the irregularity pattern and the magnetic layer formed on the recessed portions of the irregularity pattern are connected with each other.
摘要翻译： 用于磁转移的主信息载体包括具有表示要传送到从属介质的信息的不规则图案的基板和形成在基板上的不规则图案上的磁性层。 不规则图案的凹部的深度d和形成在凹部上的磁性层的厚度t满足公式-0.004 <=（t-d）/ d <= 0.1。 同时，形成在凹凸图案的突出部分上的磁性层和形成在凹凸图案的凹陷部分上的磁性层彼此连接。
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6.发明申请公开(公告)号：US20080062548A1
公开(公告)日：2008-03-13
申请号：US11851441
申请日：2007-09-07
申请人： Naoto Fujiwara , Kenji Sugiyama , Kazuhiro Niitsuma , Tadashi Yasunaga , Tsugito Maruyama , Sumio Kuroda , Yutaka Nakamura , Hiroyuki Suzuki
发明人： Naoto Fujiwara , Kenji Sugiyama , Kazuhiro Niitsuma , Tadashi Yasunaga , Tsugito Maruyama , Sumio Kuroda , Yutaka Nakamura , Hiroyuki Suzuki
CPC分类号： G11B5/865
摘要： The present invention provides a master recording medium, a magnetic transfer method, a magnetic transfer apparatus, and a magnetic recording medium and a magnetic recording and reproducing apparatus thereby made, which are capable of obtaining a good regenerative signal with few even harmonic components such as the second-order harmonic components on reproducing the information transferred to the magnetic recording medium in the case of recording the information on the magnetic recording medium having a magnetic layer composed of the perpendicular magnetization film by the magnetic transfer.
摘要翻译： 本发明提供了一种能够获得良好再生信号的主记录介质，磁转移方法，磁转移装置和磁记录介质以及由此制成的磁记录和再现装置，其具有很少的偶次谐波分量，例如 在通过磁转移将由垂直磁化膜组成的磁性层记录在磁记录介质上的情况下，再现传送到磁记录介质的信息的二次谐波分量。
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7.发明申请Patterned master carrier for magnetic transfer, magnetic recording medium, and magnetic recording/reproducing apparatus 审中-公开用于磁转移的图案化主载波，磁记录介质和磁记录/再现装置公开(公告)号：US20060082913A1
公开(公告)日：2006-04-20
申请号：US11251839
申请日：2005-10-18
CPC分类号： G11B5/865
摘要： Magnetic field absorbing regions, composed of protrusions or magnetic layers, are provided in an amplitude servo transfer pattern of a patterned master carrier for magnetic transfer. The magnetic field absorbing regions are provided in intermediate tracks between burst bit elements that constitute burst bit strings, which are provided adjacent to each other in a track width direction. The amplitude servo transfer pattern in magnetically transferred onto a magnetic recording medium. Portions of the magnetic recording medium corresponding to the magnetic field absorbing regions become magnetically non-inverted regions. Therefore, noise is not recorded, and servo tracking can be favorably performed.
摘要翻译： 磁性吸收区域由突起或磁性层构成，以图形化主载体的振幅伺服转印图案提供磁传递。 磁场吸收区域设置在构成突发位串的突发位元件之间的中间轨道中，这些突发位元件沿轨道宽度方向彼此相邻地设置。 磁转移到磁记录介质上的振幅伺服转印图案。 对应于磁场吸收区域的磁记录介质的部分变成非磁性非倒置区域。 因此，不会记录噪声，可以有利地执行伺服跟踪。
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公开(公告)号：US4956229A
公开(公告)日：1990-09-11
申请号：US175466
申请日：1988-03-30
申请人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa , Makoto Nagao
发明人： Tadashi Yasunaga , Akio Yanai , Koji Sasazawa , Makoto Nagao
CPC分类号： G11B5/653 , Y10S428/90 , Y10T428/265
摘要： A durable, rust- and scratch-resistant magnetic recording medium coated thereon a thin ferromagnetic film comprising an iron oxide nitride, wherein said film is an aggregation of pillar particles of said iron oxide nitride, said particles having a higher nitrogen content on their surface than inside the particles.
摘要翻译： 在其上涂覆有包含氧化铁氮化物的薄铁磁膜的耐久，防锈和耐划伤的磁记录介质，其中所述膜是所述氧化铁氮化物的柱状颗粒的聚集体，所述颗粒在其表面上具有较高的氮含量， 颗粒内
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9.发明授权Signal processing method of magnetic recording medium and magnetic record reproduction apparatus 失效磁记录介质和磁记录再现装置的信号处理方法公开(公告)号：US07365926B2
公开(公告)日：2008-04-29
申请号：US11229612
申请日：2005-09-20
申请人： Makoto Nagao , Tadashi Yasunaga
发明人： Makoto Nagao , Tadashi Yasunaga
CPC分类号： G11B5/09 , G11B5/00 , G11B5/59688 , G11B5/865
摘要： When signals are read out by a magnetic head from a magnetic recording medium on which magnetic bits corresponding to information are recorded along the tracks thereof by a magnetic transfer method, if a space which is longer than or equal to a length corresponding to three bits is present between consecutive magnetic bits, readout of signals from a sub-pulse generation area in the space is cancelled in readout of the magnetic bits by the magnetic head along the tracks. The signals are not read out at all, or even if the signals are read out, they are not processed as valid signals.
摘要翻译： 当通过磁转移方法从磁记录介质读出与磁信息对应的磁头的磁头从磁头中读出信号时，如果长度大于或等于与三位对应的长度的空间是 存在于连续的磁性位之间时，通过磁头沿磁道的磁头的读出来抵消从空间中的子脉冲产生区域的信号的读出。 信号根本不读出，即使读出信号，也不会将其作为有效信号进行处理。
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10.发明申请Signal processing method of magnetic recording medium and magnetic record reproduction apparatus 失效磁记录介质和磁记录再现装置的信号处理方法公开(公告)号：US20060061897A1
公开(公告)日：2006-03-23
申请号：US11229612
申请日：2005-09-20
申请人： Makoto Nagao , Tadashi Yasunaga
发明人： Makoto Nagao , Tadashi Yasunaga
CPC分类号： G11B5/09 , G11B5/00 , G11B5/59688 , G11B5/865
摘要： When signals are read out by a magnetic head from a magnetic recording medium on which magnetic bits corresponding to information are recorded along the tracks thereof by a magnetic transfer method, if a space which is longer than or equal to a length corresponding to three bits is present between consecutive magnetic bits, readout of signals from a sub-pulse generation area in the space is cancelled in readout of the magnetic bits by the magnetic head along the tracks. The signals are not read out at all, or even if the signals are read out, they are not processed as valid signals.
摘要翻译： 当通过磁转移方法从磁记录介质读出与磁信息对应的磁头的磁头从磁头中读出信号时，如果长度大于或等于与三位对应的长度的空间是 存在于连续的磁性位之间时，通过磁头沿磁道的磁头的读出来抵消从空间中的子脉冲产生区域的信号的读出。 信号根本不读出，即使读出信号，也不会将其作为有效信号进行处理。
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