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21. 发明专利

JP2005018830A Magnetic recording medium and magnetic recording and reproducing device 审中-公开
标题翻译：磁记录介质和磁记录和再现装置
公开(公告)号：JP2005018830A
公开(公告)日：2005-01-20
申请号：JP2003178540
申请日：2003-06-23
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： IGARASHI KAZUSUKATSU , HOSOE YUZURU , HIRAYAMA YOSHIYUKI , NEMOTO HIROAKI , NAKAMURA ATSUSHI
IPC分类号： G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To provide a medium in which thermal demagnetization does not occur in a certain period of time and to obtain a magnetic recording device using the medium, having high reliability for storing recorded information and realizing a recording density of 100 T (tera) bits per M 2 or larger. SOLUTION: An equation 0.28≤Hn/(Hin-Hc) is satisfied, wherein Hc, Hn and Hin are measured with a magnetic filed variation in which it requires 10 seconds to vary the magnetic field from Hin to -Hin; -Hn is a magnetic field at an intersection point of a tangential line passing a coercive force point -Hc and a straight line drawn in parallel to a magnetic field axis from positive saturated magnetization value θs in a magnetization-magnetic field curve in a direction vertical to the film surface of a medium; and Hin is an intensity of a magnetic field in which a tangential line passing a point at which a saturated magnetization value is θs/2 reaches the saturated magnetization value θs in an in-surface magnetization-magnetic field curve. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了提供在一定时间内不发生热退磁并获得使用该介质的磁记录装置的介质，具有高可靠性用于存储记录信息并实现100的记录密度 T（tera）位/ M 2 或更大。
解决方案：满足方程0.28≤Hn/（Hin-Hc），其中Hc，Hn和Hin用磁场变化测量，其中需要10秒以将磁场从Hin改变为-Hin; -Hn是在垂直方向上的磁化磁场曲线中的通过矫顽力点-Hc的切线与从磁饱和磁化值θs平行地平行绘制的直线的交点处的磁场到介质的膜表面; Hin是通过饱和磁化值为θs/ 2的点的切线在表面磁化磁场曲线中达到饱和磁化值θs的磁场强度。版权所有（C）2005，JPO＆NCIPI

22. 发明专利

JP2005004901A Magnetic head and magnetic recording method 有权
标题翻译：磁头和磁记录方法
公开(公告)号：JP2005004901A
公开(公告)日：2005-01-06
申请号：JP2003168371
申请日：2003-06-12
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： AKAGI FUMIKO , IGARASHI KAZUSUKATSU , MATSUMOTO TAKUYA , SAGA HIDEKI , ISHIKAWA HIROSHI , MOCHIZUKI MASABUMI , NAKAMURA ATSUSHI
IPC分类号： G11B5/02
CPC分类号： G11B2005/0021
摘要： PROBLEM TO BE SOLVED: To realize ultra-high density thermally assisted magnetic recording by generating near-field light in and at an optimum light irradiation position and light irradiation timing.
SOLUTION: The position to be provided with a light irradiation means is confined within a distance half the magnetic pole width in the track width direction of a main magnetic pole from a trailing side terminal 101 of the main magnetic pole 100.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：通过在最佳光照射位置和光照射时间产生近场光来实现超高密度热辅助磁记录。解决方案：设置有光照射装置的位置被限制在主磁极100的后侧端子101的主磁极的磁道宽度方向上的磁极宽度的一半的距离内。
版权所有（C）2005，JPO＆NCIPI

23. 发明专利

JPH11232632A MAGNETIC RECORD MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS 失效
公开(公告)号：JPH11232632A
公开(公告)日：1999-08-27
申请号：JP2618598
申请日：1998-02-06
申请人： HITACHI LTD
发明人： YOSHIDA KAZUYOSHI , IGARASHI KAZUSUKATSU , HIRAYAMA YOSHIYUKI , SAITO IKUO , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/127 , G11B5/64 , G11B5/65 , G11B5/84 , G11B5/85 , G11B5/851 , G11B20/00
摘要： PROBLEM TO BE SOLVED: To realize a high reproducing output and a low medium noise characteristic and to enhance stability with reference to a thermal fluctuation in a magnetic recording and reproducing system in which a ring-shaped magnetic recording head is combined with a magnetic record medium comprising vertical magnetic anisotropy. SOLUTION: In a magnetic record medium S1 to be used, the magnitude of a magnetic field at which a magnetization curve measured by applying the magnetic field to a direction perpendicular to a film face starts an irreversible magnetization inversion, i.e., the position of the shoulder of the magnetization curve, is situated in the second quadrant of the magnetization curve. The medium can be obtained in such a way that a film whose vertical anisotropy is large such as an extremely thin CoPt-based magnetic film or the like is executed to the surface of a magnetic recording film or that an etching treatment is executed to the surface so as to improve the vertical magnetic anisotropy on the surface of the film.

24. 发明专利

JPH09320033A MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING DEVICE USING IT 失效
公开(公告)号：JPH09320033A
公开(公告)日：1997-12-12
申请号：JP14135196
申请日：1996-06-04
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , HOSOE YUZURU , TAMAI ICHIRO , MANGYO EMI , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65
摘要： PROBLEM TO BE SOLVED: To provide a large-capacity recording storage that is capable of an ultra-high-density recording of at least 1Gbits per in . SOLUTION: The magnetic recording medium with a magnetic film that contains at least Co, Cr, and Pt formed on a substrate 11 has initial growth control films 12 and 12' made of Cr and ground films 13 and 13' made of an alloy with at least two types of elements selected from a group of Cr, V, Nb, Mo, Ta, W, and Ti formed on them, the ground films are in nearly body- centered cubic crystal structure, and the (100) crystal surface is grown in nearly parallel with the substrate 11. Also, the magnetic recording medium is used and the reproduction part of a magnetic head is constituted of a magneto- resistance effect type element, thus reducing noise and achieving high-overwriting at a recording density of 150 kFCI or larger. Then, by combining the magnetic recording medium and a magnetic head with an element exclusively for reproduction utilizing magnetic resistance effect, a magnetic recording device with a recording density of 1Gbits per in can be obtained.

25. 发明专利

JPH0916939A MULTIPLE MAGNETIC LAYER MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE USING THE SAME 失效
公开(公告)号：JPH0916939A
公开(公告)日：1997-01-17
申请号：JP16726495
申请日：1995-07-03
申请人： HITACHI LTD
发明人： HOSOE YUZURU , YOSHIDA KAZUYOSHI , INABA NOBUYUKI , YAMAMOTO TOMOO , IGARASHI KAZUSUKATSU , ISHIKAWA AKIRA , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , H01F10/08 , H01F10/12 , H01F10/13 , H01F10/16 , H01F10/32
摘要： PROBLEM TO BE SOLVED: To shorten magnetism transition length and to obtain high S/N and a low bit error rate by forming at least one of plural magnetic layers using an amorphous material. SOLUTION: A magneto-resistance sensor is equipped with a thin-film magneto-resistance conductive layer 73 of a ferromagnetic material formed on a gap layer 71 between a shield layer and the reluctivity sensor and an antiferromagnetic magnetic domain control layer 72 which controls the conductive layer 72 into a single magnetic domain. Further, the sensor is equipped with a nonmagnetic layer 75 which cuts off the exchanging interaction between the conductive layer 73 and control layer 72, a soft magnetic layer or permanent magnet film bias layer 77 as a means which can produces a bias magnetic field for a magnetism sensing part, and a high resistance layer 76 which adjusts the current shunting ratio between the soft magnetic layer or permanent magnet film bias layer 77 and the conductive layer 73. Consequently, the magnetism transition length can be shortened, so the high S/N and low bit error rate are obtained and mean fault intervals of >=150,000 hours are realized with high recording density of 2Gbits per square centimeter.

26. 发明专利

JPH0916935A MAGNETIC STORAGE DEVICE AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0916935A
公开(公告)日：1997-01-17
申请号：JP16052195
申请日：1995-06-27
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , INABA NOBUYUKI , IGARASHI KAZUSUKATSU , FUTAMOTO MASAAKI , HOSOE YUZURU , TAMAI ICHIRO , MANGYO EMI , YAMANAKA ICHISUKE
IPC分类号： G11B5/66 , G11B5/00 , G11B5/012 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/82 , G11B20/14
摘要： PURPOSE: To obtain a magnetic storage device and a magnetic recording medium capable of recording and reproduction at high recording density of >=1 gigabit per 1in and having high reliability. CONSTITUTION: The magnetic layer of a magnetic recording medium is made of a mixture of at least one kind of nonmagnetic compd. selected from among oxides and nitrides with a magnetic material contg. Co and Pt as principal components, and the molar ratio of Pt to Co in the magnetic layer is regulated to 0.6-1.2. A magnetoresistance effect type magnetic head for reproduction is adopted. A high S-N ratio and a low bit error rate are ensured and >=150,000hr average trouble interval at high recording density of 1 gigabit per 1in can be attained.

27. 发明专利

JPH08147665A MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE USING THE MEDIUM 失效
公开(公告)号：JPH08147665A
公开(公告)日：1996-06-07
申请号：JP27777694
申请日：1994-11-11
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , INABA NOBUYUKI , YAMAMOTO TOMOO , IGARASHI KAZUSUKATSU , HOSOE YUZURU , ISHIKAWA AKIRA
IPC分类号： C22C27/06 , G11B5/02 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738
摘要： PURPOSE: To obtain an in-plane magnetic recording medium fit for high-density magnetic recording. CONSTITUTION: Magnetic films 103, 104 and a protecting film 105 are formed directly or via a non-magnetic undercoat layer 102 on a non-magnetic substrate 101 in this magnetic recording medium. A coercive force Hc (1) measured in a direction within a plane of the magnetic film, a coercive force Hc (p) measured in a vertical direction to the coercive force Hc(1), and a product Br.t of a remnant magnetization Br measured in the direction within the plane of the magnetic film and a film thickness (t) are set to satisfy the following relation: -0.5 =2kOe, and 20G.μm

28. 发明专利

JPH0863734A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE FORMED BY USING THE SAME 失效
公开(公告)号：JPH0863734A
公开(公告)日：1996-03-08
申请号：JP19815094
申请日：1994-08-23
申请人： HITACHI LTD
发明人： IGARASHI KAZUSUKATSU , TANAHASHI KIWAMU , HOSOE YUZURU , SHIROISHI YOSHIHIRO , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/09 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/738
摘要： PURPOSE: To decrease the noises of a magnetic recording medium by constituting this medium in such a manner that the ratio in the degradation of the saturation magnetization of the magnetic recording medium entailing a temp. rise is less steep at room temp. and that the coercive force of the magnetic recording medium attains the maximal value at room temp. CONSTITUTION: The cause for the degradation in the coercive force according to the extreme reduction of the thickness of a magnetic layer lies in that the disturbance 19 in crystals of a thickness of about 1 to 2nm arises in the initial stage of growth and that the degradation in the coercive force is resulted from such disturbance when a magnetic layer 13 is formed on a nonmagnetic substrate 11. A nonmagnetic structure control layer 18 having nearly the same crystal structure as the crystal structure of the magnetic layer 13 is formed prior to formation of the magnetic layer 13, by which the region 19 disturbed in the initial crystals is confined into this structure control layer 18 in order to assure the sufficient coercive force even if the thickness of the magnetic film is small. The structure control layer 18 contains at least one magnetic elements selected from a group of Co, Fe and Ni for this purpose. The purpose is attained by setting the ratio of these magnetic elements lower than the ratio thereof in the magnetic layer 13.

29. 发明专利

JPH06249983A LOW TEMPERATURE NUCLEAR FUSION METHOD 失效
公开(公告)号：JPH06249983A
公开(公告)日：1994-09-09
申请号：JP4089993
申请日：1993-03-02
申请人： HITACHI LTD
发明人： IGARASHI KAZUSUKATSU , YAMAMOTO YOSHIHIKO , KAJIYAMA HIROSHI , MITSUYA MUNEHISA , MIYAKE TATSUYA , OGAWA SUSUMU , ETO KIMITOSHI , OTAKE ICHIRO
IPC分类号： C03B3/00 , C25B1/06 , C25B5/00 , G21B1/00 , G21B3/00
摘要： PURPOSE:To allow highly efficient starting of fusion reaction by increasing the presence ratio of isotope of Li in a negative pole material, which can store hydrogen internally, over a specific %. CONSTITUTION:A 0.01mol sulfuric acid heavy water solution is employed as an ion conductor 2 containing heavy water ions 12 while a copper-lithium alloy is employed as a negative electrode material 1 thus performing electrolysis. Consequently, negative ions 5 migrate toward a positive pole whereas positive ions 4 migrate toward the negative electrode 1. Heavy water ions 12 are taken into the negative electrode 1 as the positive ions 4. Temperature is then measured using a thermocouple 51 fixed to the negative electrode 1 through boron nitride 52. Temperature begins to rise upon elapse of one hour after start of electrolysis by about 5 deg.C. The temperature rises continuously for a while even if current supply is interrupted. The concentration of H in the negative electrode 1 can be increased when an Li0.1Ni0.1V0.8 alloy containing 10% of Li is coated with Pb by 100mu, for example.

30. 发明专利

JPH06229955A SURFACE ATOM ARRANGEMENT MEASURING INSTRUMENT 失效
公开(公告)号：JPH06229955A
公开(公告)日：1994-08-19
申请号：JP1988593
申请日：1993-02-08
申请人： HITACHI LTD
发明人： KAJIYAMA HIROSHI , OGAWA SUSUMU , IGARASHI KAZUSUKATSU , MIYAKE TATSUYA , YAMAMOTO YOSHIHIKO
IPC分类号： G01N23/225 , G01Q30/02 , G01Q60/10
摘要： PURPOSE:To modulate the electron wave function on a crystal surface artificially and then measure the diffraction peak according to atomic beam molecular beam by exciting elements selectively for examining the element arrangement on the crystal surface. CONSTITUTION:The inside of a vacuum container 1 can be evacuated up to 3X1/10 Pa using a vacuum exhaust device 2. A sample 3 is placed on a sample stand 4. The temperature of the sample stand 4 can be retained to an arbitrary value between 150K and 2000K. Further, a rotary mechanism is provided to enable the incidence angle of X rays to be changed. X rays can be applied to the sample through a beryllium window 5. With helium molecule, heated helium gas 6 is supplied as quasi-monochromatic molecular beam from a metal nozzle 7. A quadruplex pole mass analyzer 8 is provided to measure the type. number, and angle of scattered atoms from a substrate surface. A scanning-type tunnel microscope is provided to observe the substrate surface at atom level.

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