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公开(公告)号：US10170695B2
公开(公告)日：2019-01-01
申请号：US15283272
申请日：2016-09-30
申请人： Yoshiaki Sonobe , Hiroyoshi Itoh
发明人： Yoshiaki Sonobe , Hiroyoshi Itoh
摘要： A magnetic tunnel junction device includes a Heusler alloy layer that has not only a perpendicular magnetic anisotropy characteristic, but also a half-metallicity characteristic. For example, the magnetic tunnel junction device includes at least one Heusler alloy layer and a barrier layer. The barrier layer is in contact with the Heusler alloy layer and has an insulating property. A compressive strain is exerted on the Heusler alloy layer in a direction parallel to an interface between the Heusler alloy layer and the barrier layer.
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2.发明授权公开(公告)号：US08795790B2
公开(公告)日：2014-08-05
申请号：US13133941
申请日：2009-12-09
申请人： Yoshiaki Sonobe , Akira Shimada , Tsuyoshi Ozawa , Masanori Aniya
发明人： Yoshiaki Sonobe , Akira Shimada , Tsuyoshi Ozawa , Masanori Aniya
摘要： [Problem] An object is to provide a magnetic recording medium with improved HDI characteristics, such as impact resistance, and its manufacturing method.[Solution] A typical structure of a magnetic recording medium 100 according to the present invention includes, on a base, at least a magnetic recording layer 122, a protective layer 126, and a lubricating layer 128, wherein the magnetic recording layer 122 includes, in an in-plane direction, a magnetic recording part 136 configured of a magnetic material and a non-recording part 134 magnetically separating the magnetic recording part 136, and a surface corresponding to the non-recording part 134 protuberates more than a surface corresponding to the magnetic recording part 136.
摘要翻译： 目的在于提供具有改善的HDI特性（例如耐冲击性）的磁记录介质及其制造方法。 [解决方案]根据本发明的磁记录介质100的典型结构在基底上至少包括磁记录层122，保护层126和润滑层128，其中磁记录层122包括， 在面内方向上，由磁性材料构成的磁记录部分136和磁记录部分136磁性分离的非记录部分134，与非记录部分134对应的表面突出多于对应于 磁记录部分136。
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3.发明申请公开(公告)号：US20100321826A1
公开(公告)日：2010-12-23
申请号：US12745206
申请日：2009-03-09
摘要： It is an object to manufacture magnetic recording media with the high recording density. Since nonmagnetic portions (8) with a predetermined pattern are formed in a recording auxiliary layer (4) formed on a magnetic recording layer (3), it is possible to actualize a magnetic recording medium where magnetic portions (7) and the magnetic recording layer (3) immediately below the portions (7) are recording units. The nonmagnetic portions (8) are formed by non-magnetization using ion implantation, and it is thereby possible to manufacture magnetic recording media with the high recording density.
摘要翻译： 本发明的目的是制造具有高记录密度的磁记录介质。 由于在形成在磁记录层（3）上的记录辅助层（4）中形成具有预定图案的非磁性部分（8），因此可以实现磁记录介质，其中磁性部分（7）和磁记录层 （3）的正下方是记录单元。 非磁性部分（8）通过使用离子注入的非磁化形成，从而可以制造具有高记录密度的磁记录介质。
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4.发明授权公开(公告)号：US06537638B2
公开(公告)日：2003-03-25
申请号：US09681056
申请日：2000-12-13
申请人： Hoa Do , Yoshihiro Ikeda , Yoshiaki Sonobe , Kentaro Takano
发明人： Hoa Do , Yoshihiro Ikeda , Yoshiaki Sonobe , Kentaro Takano
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/65 , Y10S428/90
摘要： A perpendicular magnetic recording disk has an underlayer structure that causes the magnetic layer to have perpendicular magnetic anisotropy and high signal-to-noise ratio (SNR). The underlayer structure comprises a B2 type body-centered-cubic (BCC) material, such as the binary alloys NiAl, RuAl and RuTi, as an underlayer, and a Ti or TiCr alloy sublayer formed directly on the underlayer. The magnetic layer, such as a CoCrPt alloy, is deposited directly on the sublayer. The magnetic layer has perpendicular magnetic anisotropy due to the sublayer yet excellent SNR because of the smaller grain size of the sublayer material formed directly on the B2 type underlayer.
摘要翻译： 垂直磁记录盘具有底层结构，其使磁层具有垂直的磁各向异性和高的信噪比（SNR）。 底层结构包括B2型体心立方（BCC）材料，例如作为底层的二元合金NiAl，RuAl和RuTi，以及直接形成在底层上的Ti或TiCr合金子层。 磁性层，如CoCrPt合金，直接沉积在子层上。 由于子层材料直接在B2型底层上形成的较小的晶粒尺寸，所以磁层由于子层而具有良好的SNR，具有垂直的磁各向异性。
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公开(公告)号：US4908722A
公开(公告)日：1990-03-13
申请号：US214584
申请日：1988-07-01
申请人： Yoshiaki Sonobe
发明人： Yoshiaki Sonobe
CPC分类号： G11B20/1419 , G11B20/10009 , G11B5/035 , G11B5/016
摘要： A digital magnetic recording/reproduction apparatus and method for recording and reproducing a digital information signal. The apparatus comprises a magnetic head, a recording system means for recording the digital information signal and a calibration signal with a specific digital pattern in a magnetic recording medium, through the same signal path, a reproduction system for reproducing the recorded digital information signal and the recorded calibration signal, through the same signal path, and for outputting a reproduced signal, a waveform equalizer for equalizing a waveform of the reproduced signal, a data discriminator for discriminating a data signal from the signal output from the waveform equalizer, by using a window signal, and a calibration system for controlling a characteristic of the waveform equalizer and/or the recording current supplied to the magnetic head so as to maximize a window margin of the data discriminating circuit.
摘要翻译： 一种用于记录和再现数字信息信号的数字磁记录/再现装置和方法。 该装置包括磁头，用于通过相同的信号路径将数字信息信号和具有特定数字图形的校准信号记录在磁记录介质中的记录系统装置，用于再现所记录的数字信息信号的再现系统和 记录的校准信号，通过相同的信号路径输出再生信号，用于均衡再现信号的波形的波形均衡器，用于从波形均衡器输出的信号中识别数据信号的数据鉴别器，通过使用窗口 信号，以及用于控制波形均衡器的特性和/或提供给磁头的记录电流的校准系统，以便使数据识别电路的窗口边缘最大化。
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公开(公告)号：US08414966B2
公开(公告)日：2013-04-09
申请号：US12745194
申请日：2009-03-09
申请人： Junichi Yasumori , Yoshiaki Sonobe
发明人： Junichi Yasumori , Yoshiaki Sonobe
摘要： To provide a magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced and a manufacturing method of the medium, a method of manufacturing a magnetic recording medium of the invention is to manufacture a magnetic recording medium having a magnetic recording layer of a granular structure having nonmagnetic boundary portions between pillar-shaped magnetic particles on a nonmagnetic substrate, and an exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles, and is characterized by having an ion irradiation step of performing ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer.
摘要翻译： 为了提供能够显着降低间隔损耗的优异磁记录再现特性的磁记录介质和介质的制造方法，本发明的磁记录介质的制造方法是制造具有磁记录的磁记录介质 在非磁性基板上的柱状磁性颗粒之间具有非磁性边界部分的粒状结构层和设置在磁记录层上的交换耦合层，以增加耦合磁性颗粒的作用，其特征在于具有离子辐射 在将记录层上的交换耦合层分层之后，在交换耦合层的整个表面上进行离子辐射的步骤。
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7.发明申请公开(公告)号：US20100021768A1
公开(公告)日：2010-01-28
申请号：US12526866
申请日：2008-02-13
申请人： Yoshiaki Sonobe , Takahiro Onoue , Koichi Wago
发明人： Yoshiaki Sonobe , Takahiro Onoue , Koichi Wago
摘要： [PROBLEMS] To improve the track density by reducing the track edge noise and sharpening the boundaries of a recording magnetic field by blocking the recording magnetic field spreading outside the recording region in magnetic recording.[MEANS FOR SOLVING PROBLEMS] A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20). The continuous film layer (24) has hard magnetic portions (204) formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer (20) and magnetic shield portions (202) formed between the hard magnetic portions (204), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.
摘要翻译： [问题]通过在磁记录中阻挡记录磁场外的记录磁场扩展，通过减小轨道边缘噪声和锐化记录磁场的边界来提高轨道密度。 解决问题的手段磁记录介质（10）具有在基板（12）上形成的基板（12）和垂直磁记录层（30）。 垂直磁记录层（30）具有其中记录有磁信号的粒状层（20）和磁性耦合到粒状层（20）的连续膜层（24）。 连续薄膜层（24）具有形成在磁性信号被记录在粒状层（20）中的记录区域对应的位置上的硬磁性部分（204）和形成在硬磁性部分（204）之间的磁屏蔽部分（202） 每个磁化曲线在测量磁化曲线时具有比施加的磁场为零的区域中的硬磁性部分的斜率大的磁化曲线，并且每个磁化曲线的残余磁极化小于硬磁性部分中的残余磁极化。
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8.发明申请公开(公告)号：US20090117408A1
公开(公告)日：2009-05-07
申请号：US12295573
申请日：2007-03-31
CPC分类号： G11B5/66 , G11B5/65 , G11B5/667 , G11B5/7325
摘要： To provide a perpendicular magnetic recording disk having a film structure that improves overwrite characteristics (O/W) while maintaining a coercive force (Hc) high enough not to affect heat fluctuation resistance, and a manufacturing method thereof.A magnetic disk for use in perpendicular magnetic recording, having at least an underlayer, a first magnetic recording layer, and a second magnetic recording layer on a substrate in the order named, characterized in that the first magnetic recording layer and the second magnetic recording layer are each a ferromagnetic layer of a granular structure containing a nonmagnetic substance forming grain boundary portions between crystal grains containing at least Co (cobalt) and, given that the content of the nonmagnetic substance in the first magnetic recording layer is A mol % and the content of the nonmagnetic substance in the second magnetic recording layer is B mol %, A
摘要翻译： 提供一种具有提高覆盖特性（O / W）的膜结构的垂直磁记录盘及其制造方法，同时保持矫顽力（Hc）足够高以不影响耐热波动性。 一种用于垂直磁记录的磁盘，其特征在于，具有至少下层，第一磁记录层和第二磁记录层，其特征在于，第一磁记录层和第二磁记录层 分别是含有形成至少包含Co（钴）的晶粒之间的晶界部分的非磁性物质的粒状结构的铁磁层，并且考虑到第一磁记录层中的非磁性物质的含量为A摩尔％，含量 的第二磁记录层中的非磁性物质为B摩尔％，A
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公开(公告)号：US20090081483A1
公开(公告)日：2009-03-26
申请号：US11909598
申请日：2006-03-20
申请人： Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
发明人： Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
CPC分类号： G11B5/7325 , G11B5/66
摘要： A magnetic disk 10 for use in perpendicular magnetic recording, which includes an underlayer 18, a size-reduction promoting layer 20 (nonmagnetic granular layer) of a granular structure, and a magnetic recording layer 22 having a ferromagnetic layer 32 of a granular structure. The size-reduction promoting layer 20 has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer 18 and the ferromagnetic layer 32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer 32.
摘要翻译： 用于垂直磁记录的磁盘10，其包括底层18，粒状结构的尺寸减小促进层20（非磁性粒状层）和具有粒状结构的铁磁层32的磁记录层22。 尺寸减小促进层20具有无机氧化物基体和非磁性金属晶粒，并且设置在底层18和铁磁层32之间，从而减小铁磁层32中的磁晶粒的尺寸。
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10.发明授权Perpendicular signal equalization and timing recovery using Hilbert transform 失效使用希尔伯特变换的垂直信号均衡和定时恢复公开(公告)号：US06687067B2
公开(公告)日：2004-02-03
申请号：US09802636
申请日：2001-03-09
申请人： Francesco Brianti , Bertrand Gabillard , Martin Aureliano Hassner , Manfred Ernst Schabes , Yoshiaki Sonobe , Barry Marshall Trager
发明人： Francesco Brianti , Bertrand Gabillard , Martin Aureliano Hassner , Manfred Ernst Schabes , Yoshiaki Sonobe , Barry Marshall Trager
IPC分类号： G11B509
CPC分类号： G11B20/1403 , G11B5/00 , G11B5/09 , G11B20/10009 , G11B2005/0002 , G11B2005/0005 , G11B2005/0029
摘要： A Hilbert transform is used to process perpendicular magnetic recording signals from both single layer and dual layer disks to produce a complex analytic signal. This complex analytic signal is used to derive angles of magnetization, which depend on the distance between recorded magnetic transitions and consequently which can be used in error estimation. Moreover, the Hilbert transform in cooperation with an equalizer FIR optimizes transformation of the signal such that conventional longitudinal recording processing methods can subsequently be used to process the signal that is read back from the magnetic recording medium.
摘要翻译： Hilbert变换用于处理来自单层和双层磁盘的垂直磁记录信号，以产生复杂的分析信号。 这种复杂的分析信号被用于导出磁化角，这取决于所记录的磁转移之间的距离，因此可以用于误差估计。 此外，与均衡器FIR协调的希尔伯特变换优化信号的变换，使得随后可以使用常规的纵向记录处理方法来处理从磁记录介质读回的信号。
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