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公开(公告)号：US5738927A
公开(公告)日：1998-04-14
申请号：US459794
申请日：1995-06-02
申请人： Atsushi Nakamura , Masaaki Futamoto , Yoshiyuki Hirayama , Mikio Suzuki , Yukio Honda , Takanobu Takayama
发明人： Atsushi Nakamura , Masaaki Futamoto , Yoshiyuki Hirayama , Mikio Suzuki , Yukio Honda , Takanobu Takayama
CPC分类号： G11B5/7315 , G11B5/656 , G11B5/7325 , Y10S428/90 , Y10T428/24355
摘要： A film 12 with perpendicular magnetic anisotropy and a protective film 13 are formed over a single-crystal substrate 11. This substrate is made of either a single crystal having a hexagonal crystal structure and a plane (0001) in parallel with the substrate plane or a single crystal having a cubic crystal structure and a plane (111) in parallel with the substrate plane, and the film is epitaxially grown such that its easy axis of magnetization is perpendicular to the substrate plane. As a result, the film can have its perpendicular orientation and perpendicular magnetic anisotropy improved to effect a perpendicular magnetic recording of high density thereby to provide the perpendicular magnetic recording media, of which the film has a remarkably enhanced orientation.
摘要翻译： 具有垂直磁各向异性的膜12和保护膜13形成在单晶衬底11上。该衬底由具有六方晶系结构的单晶和与衬底平面平行的平面（0001）制成，或者 具有立方晶体结构的单晶和与衬底平面平行的平面（111），并且膜被外延生长，使得其易磁化轴垂直于衬底平面。 结果，膜可以具有其垂直取向和垂直磁各向异性改善以实现高密度的垂直磁记录，从而提供垂直的磁记录介质，其中膜具有显着增强的取向。
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公开(公告)号：US5599580A
公开(公告)日：1997-02-04
申请号：US632355
申请日：1996-04-10
申请人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
发明人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656 , G11B5/7315 , G11B5/8404 , Y10S428/90 , Y10S428/928 , Y10T428/12465 , Y10T428/12819 , Y10T428/12826 , Y10T428/1284 , Y10T428/12847 , Y10T428/12854 , Y10T428/24355 , Y10T428/265
摘要： A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.
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公开(公告)号：US5685958A
公开(公告)日：1997-11-11
申请号：US729381
申请日：1996-10-17
申请人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
发明人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656 , G11B5/7315 , G11B5/8404 , Y10S428/90 , Y10S428/928 , Y10T428/12465 , Y10T428/12819 , Y10T428/12826 , Y10T428/1284 , Y10T428/12847 , Y10T428/12854 , Y10T428/24355 , Y10T428/265
摘要： A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.
摘要翻译： 磁记录介质由玻璃制成的基板，一个或两个底层和磁性膜构成。 为了使磁性膜的易磁化轴平行于磁性膜，将具有NaCl晶体结构的底层重叠在基板上。 在该底层上形成由具有六方密堆积结晶结构的Co基合金制成的磁性膜，在需要时将其由具有体心立方晶体结构的材料制成的底层。 通过在衬底的表面部分中沿预定方向形成沟槽来增加磁性膜的磁各向异性。 这些槽也起到确定由具有NaCl晶体结构的材料制成的底层的取向的作用。
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公开(公告)号：US5536585A
公开(公告)日：1996-07-16
申请号：US207609
申请日：1994-03-09
申请人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
发明人： Masaaki Futamoto , Atsushi Nakamura , Nobuyuki Inaba , Yoshiyuki Hirayama , Yoshibumi Matsuda , Mikio Suzuki , Yukio Honda
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656 , G11B5/7315 , G11B5/8404 , Y10S428/90 , Y10S428/928 , Y10T428/12465 , Y10T428/12819 , Y10T428/12826 , Y10T428/1284 , Y10T428/12847 , Y10T428/12854 , Y10T428/24355 , Y10T428/265
摘要： A magnetic recording medium is constructed with a substrate made of glass, one or two underlayers, and a magnetic film. In order that the easy magnetization axis of the magnetic film is parallel to the magnetic film, an underlayer having an NaCl crystallographic structure is superposed on the substrate. A magnetic film made of a Co based alloy having a hexagonal close packed crystallographic structure is formed on this underlayer, putting an underlayer made of a material having a body centered cubic crystallographic structure therebetween at need. Magnetic anisotropy of the magnetic film is increased by forming grooves in a predetermined direction in a surface portion of the substrate. These grooves play a role also for defining the orientation of the underlayer made of the material having an NaCl crystallographic structure.
摘要翻译： 磁记录介质由玻璃制成的基板，一个或两个底层和磁性膜构成。 为了使磁性膜的易磁化轴平行于磁性膜，将具有NaCl晶体结构的底层重叠在基板上。 在该底层上形成由具有六方密堆积结晶结构的Co基合金制成的磁性膜，在需要时将其由具有体心立方晶体结构的材料制成的底层。 通过在衬底的表面部分中沿预定方向形成沟槽来增加磁性膜的磁各向异性。 这些槽也起到确定由具有NaCl晶体结构的材料制成的底层的取向的作用。
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5.发明授权公开(公告)号：US06349008B1
公开(公告)日：2002-02-19
申请号：US09176114
申请日：1998-10-21
申请人： Takanobu Takayama , Kiwamu Tanahashi , Kazuetsu Yoshida , Mikio Suzuki , Yoshiyuki Hirayama , Masaaki Futamoto , Yohji Maruyama
发明人： Takanobu Takayama , Kiwamu Tanahashi , Kazuetsu Yoshida , Mikio Suzuki , Yoshiyuki Hirayama , Masaaki Futamoto , Yohji Maruyama
IPC分类号： G11B502
CPC分类号： G11B5/656 , G11B5/012 , G11B5/1278 , G11B5/62 , G11B5/82
摘要： A magnetic recording medium wherein, when the axis of easy magnetization of the magnetic recording medium for magnetically recording information by means of a magnetic head is projected onto a surface of the magnetic recording medium, the axis projected onto the surface of the magnetic recording medium exists so as to be unidirectionally inclined with respect to the direction of a track on which information is to be recorded, whereby, by using the magnetic recording medium, there can be provided a magnetic head and a magnetic read-write apparatus greatly improved in longitudinal recording density.
摘要翻译： 一种磁记录介质，其中当用于通过磁头磁信息记录的磁记录介质的易磁化轴被投影到磁记录介质的表面上时，投射到磁记录介质的表面上的轴存在 相对于要记录信息的轨道的方向是单向倾斜的，由此通过使用磁记录介质，可以提供在纵向记录中大大改进的磁头和磁读写装置 密度。
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6.发明授权
公开(公告)号：US5875082A
公开(公告)日：1999-02-23
申请号：US794709
申请日：1997-02-04
申请人： Takanobu Takayama , Kiwamu Tanahashi , Kazuetsu Yoshida , Mikio Suzuki , Yoshiyuki Hirayama , Masaaki Futamoto , Yohji Maruyama
发明人： Takanobu Takayama , Kiwamu Tanahashi , Kazuetsu Yoshida , Mikio Suzuki , Yoshiyuki Hirayama , Masaaki Futamoto , Yohji Maruyama
摘要： A magnetic recording medium wherein, when the axis of easy magnetization of the magnetic recording medium for magnetically recording information by means of a magnetic head is projected onto a surface of the magnetic recording medium, the axis projected onto the surface of the magnetic recording medium exists so as to be unidirectionally inclined with respect to the direction of a track on which information is to be recorded, whereby, by using the magnetic recording medium, there can be provided a magnetic head and a magnetic read-write apparatus greatly improved in longitudinal recording density.
摘要翻译： 一种磁记录介质，其中当用于通过磁头磁信息记录的磁记录介质的易磁化轴被投影到磁记录介质的表面上时，投射到磁记录介质的表面上的轴存在 相对于要记录信息的轨道的方向是单向倾斜的，由此通过使用磁记录介质，可以提供在纵向记录中大大改进的磁头和磁读写装置 密度。
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公开(公告)号：US07026810B2
公开(公告)日：2006-04-11
申请号：US11054383
申请日：2005-02-10
IPC分类号： G01B7/00
CPC分类号： G11B5/667 , G11B5/00 , G11B5/012 , G11B20/10009 , G11B20/24 , G11B27/36 , G11B2005/001 , G11B2005/0029 , G11B2220/20
摘要： An object is to automatically detect the positions of spike noise, create a distribution diagram, and perform pass/fail decisions. The cross-correlation function of the signal waveform from a magnetic head 1 and a reference waveform simulating spike noise is used in extraction of spike noise. The number of peaks in the cross-correlation function exceeding a threshold value is counted, and quantitative evaluation of spike noise is performed.
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公开(公告)号：US06562453B1
公开(公告)日：2003-05-13
申请号：US09610455
申请日：2000-07-05
IPC分类号： G11B566
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/012 , G11B5/3909 , G11B5/64 , G11B5/667 , G11B5/7325 , G11B2005/001 , G11B2005/0016 , G11B2005/0029 , G11B2005/3996 , Y10S428/90 , Y10T428/12465 , Y10T428/26 , Y10T428/265
摘要： To provide an improved perpendicular magnetic recording medium suitable for high density magnetic recording. In a perpendicular magnetic recording medium comprising a perpendicular magnetic layer and protective layer provided on a non-magnetic substrate via a soft magnetic backlayer, a polycrystalline MgO film is inserted between the soft magnetic backlayer and perpendicular magnetic layer.
摘要翻译： 提供适用于高密度磁记录的改进的垂直磁记录介质。 在包括通过软磁性背层设置在非磁性基板上的垂直磁性层和保护层的垂直磁记录介质中，在软磁性背层和垂直磁性层之间插入多晶MgO膜。
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9.发明授权公开(公告)号：US06403203B2
公开(公告)日：2002-06-11
申请号：US09379462
申请日：1999-08-24
申请人： Masaaki Futamoto , Nobuyuki Inaba , Yoshiyuki Hirayama , Yukio Honda , Kazuetsu Yoshida , Kenya Ito
发明人： Masaaki Futamoto , Nobuyuki Inaba , Yoshiyuki Hirayama , Yukio Honda , Kazuetsu Yoshida , Kenya Ito
IPC分类号： G11B5667
CPC分类号： H04B10/504 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12861 , Y10T428/12875 , Y10T428/24942 , Y10T428/2495 , Y10T428/24975 , Y10T428/26 , Y10T428/265
摘要： Magnetic recording medium includes at least two layers having different magnetic anisotropy constants formed on a substrate and the perpendicular magnetic anisotropy of the second magnetic film of those magnetic films, far from the substrate surface, made equal to or larger than that of the first magnetic film near to the substrate surface, thus improving the magnetic isolation of the first magnetic film near to the substrate surface.
摘要翻译： 磁记录介质包括形成于基板上的至少两层不同的磁各向异性常数，并且远离基板表面的这些磁性膜的第二磁性膜的垂直磁各向异性等于或大于第一磁性膜 靠近基板表面，从而改善靠近基板表面的第一磁性膜的磁隔离。
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10.发明授权公开(公告)号：US06183893B2
公开(公告)日：2001-02-06
申请号：US09285751
申请日：1999-04-05
申请人： Masaaki Futamoto , Yoshiyuki Hirayama , Kenya Ito , Kazuetsu Yoshida , Yukio Honda , Nobuyuki Inaba
发明人： Masaaki Futamoto , Yoshiyuki Hirayama , Kenya Ito , Kazuetsu Yoshida , Yukio Honda , Nobuyuki Inaba
IPC分类号： B32B1500
CPC分类号： G11B5/7325 , G11B5/00 , G11B5/012 , G11B5/66 , G11B2005/0029 , Y10S428/90 , Y10S428/928 , Y10T428/12861 , Y10T428/12875 , Y10T428/265
摘要： The present invention relates to a perpendicular magnetic recording medium and a magnetic storage apparatus which are improved to be suitable for high-density magnetic recording. An object thereof is to provide the perpendicular magnetic recording medium and the magnetic storage apparatus which have a low noise property for realizing a recording density of 10 Gb/in.2 or more and a high stability against thermal fluctuation. The perpendicular magnetic recording medium comprising a perpendicular magnetic film formed through an underlayer on a nonmagnetic substrate, wherein the underlayer comprises a material having a hexagonal close packed structure or an amorphous structure, and has a first underlayer nearer to the substrate, and a second underlayer having a hexagonal close packed structure formed on the first underlayer and a preferred growth orientation of [0001] and comprising a material capable of hetero-epitaxy growth onto the perpendicular magnetic film.
摘要翻译： 本发明涉及一种改进为适合于高密度磁记录的垂直磁记录介质和磁存储装置。 其目的是提供具有低噪声特性的垂直磁记录介质和磁存储装置，以实现10Gb / in.2以上的记录密度和对热波动的高稳定性。垂直磁记录介质包括 在非磁性基板上通过下层形成的垂直磁性膜，其中，所述下层包括具有六方密堆积结构或非晶结构的材料，并且具有更靠近所述基板的第一底层和具有六方密堆积结构的第二底层 形成在第一底层上，并且具有优选的生长方向，并且包括能够在垂直磁性膜上进行异质外延生长的材料。
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