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1. 发明专利

JP2000076638A Magnetic recording medium and its production 审中-公开
标题翻译：磁记录媒体及其制作
公开(公告)号：JP2000076638A
公开(公告)日：2000-03-14
申请号：JP24023898
申请日：1998-08-26
申请人： Hitachi Ltd , Hitachi Maxell Ltd , 日立マクセル株式会社 , 株式会社日立製作所
发明人： OGAWA YOICHI , YANO AKIRA , KITAGAKI NAOKI , SHIRAI HIROSHI , TAKAYAMA TAKANOBU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To enable superior C/N characteristics by forming a metallic magnetic thin film comprising crystal grains of a specified grain diameter formed on a substrate so that the grain diameter of the crystal grains is increased as it goes from the substrate side of the thin film toward the outer surface side.
SOLUTION: A metallic magnetic thin film 10 is formed from crystal grains of ≤20 nm average grain diameter so that the grain diameters of the Co crystal grains 11 and Co-O crystal grains 12 are stepwise increased as they go from the substrate side of the thin film 10 toward the outer surface side. The grain diameter is controlled and formed by adjusting the temperature of a can while optionally combining the intrusion of an inert gas as well. By increasing the grain diameter of the crystal grains near the outer surface of the thin film 10, the crystal magnetic anisotropy of the grains is enhanced and output is increased. Because of the small crystal grains on the substrate side, magnetic domains are made small, noise is reduced and a C-N ratio is increased. The tilt direction of the columnar crystal grains of a lower metallic magnetic layer 10a and an upper metallic magnetic thin film 10b may be changed.
COPYRIGHT: (C)2000,JPO
摘要翻译：要解决的问题：为了通过形成包含在基板上形成的特定晶粒直径的金属磁性薄膜，使得晶粒的晶粒直径从基板侧的基板侧开始增加，从而实现优异的C / N特性该薄膜朝向外表面侧。解决方案：金属磁性薄膜10由<= 20nm平均粒径的晶粒形成，使得Co晶粒11和Co-O晶粒12的晶粒直径从基底侧逐渐增加薄膜10朝向外表面侧。通过调节罐的温度来控制和形成颗粒直径，同时可选地组合惰性气体的侵入。通过增加薄膜10的外表面附近的晶粒的粒径，晶粒的晶体磁各向异性提高，输出增加。由于基板侧的晶粒小，所以磁畴变小，噪声降低，C-N比增大。可以改变下金属磁性层10a和上金属磁性薄膜10b的柱状晶粒的倾斜方向。

2. 发明专利

JPH0453017A PERPENDICULAR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0453017A
公开(公告)日：1992-02-20
申请号：JP15978190
申请日：1990-06-20
申请人： HITACHI LTD , HITACHI MAXELL
发明人： YANO AKIRA , YOSHIDA KAZUYOSHI , TAKAYAMA TAKANOBU
IPC分类号： G11B5/66 , C08L67/02 , G11B5/64 , G11B5/65 , G11B5/73
摘要： PURPOSE:To improve durability of the medium by forming a Co-partially oxidized film so that the inner tensile stress remaining in the film is a specified value or less and that the ferromagnetic metal grains are needle-like grains having specified short axial length or shorter. CONSTITUTION:The inner tensile stress remaining in the film is specified to dyn/cm , and dyn/cm inner stress can be realized by forming ferromagnetic metal grains needle-like grains having Pa. Thereby, the perpendicular magnetic recording medium having excellent sliding resistance can be obtained without providing a protective film.

3. 发明专利

JPH01232536A PRODUCTION OF PERPENDICULAR MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH01232536A
公开(公告)日：1989-09-18
申请号：JP5607888
申请日：1988-03-11
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , YOSHIDA KAZUYOSHI
IPC分类号： G11B5/72 , C08L79/08 , G11B5/64 , G11B5/73 , G11B5/85
摘要： PURPOSE:To improve magnetic characteristics and to obtain the medium having high recording and reproducing outputs by forming a magnetic layer consisting of a partial oxide which consists essentially of metal Co on a nonmagnetic substrate, then subjecting the layer to a heating treatment. CONSTITUTION:Co is deposited by evaporation from a vapor deposition source 2 for heating with an electron beam onto the nonmagnetic substrate 1 to form the partial oxide film of Co thereon while the inflow rate of oxygen 4 into a vacuum deposition device is adjusted by a needle valve 5 of the device. The substrate is then subjected to the heating treatment at 100-300 deg.C in the atm. The magnetic characteristics are thereby improved and the medium having the high recording and reproducing outputs is obtd.

4. 发明专利

JPS6360197A FORMATION OF COMPOUND SEMICONDUCTOR THIN FILM 失效
公开(公告)号：JPS6360197A
公开(公告)日：1988-03-16
申请号：JP20367786
申请日：1986-09-01
申请人： HITACHI LTD
发明人： TAKAYAMA TAKANOBU , TAKAGI KAZUMASA , KOBAYASHI TOSHIO , SUSA KENZO
IPC分类号： C30B25/14 , C30B23/08 , C30B25/16 , C30B25/18 , C30B29/40 , H01L21/203 , H01L21/205
摘要： PURPOSE:To obtain the title compd. semiconductor thin film having excellent flatness and crystallinity by supplying a group V element in excess at the initial stage for forming a III-V compd. semiconductor thin film. CONSTITUTION:An initial growth layer 2 is formed on a group IV single crystal substrate 1 in 50-500nm thickness while increasing the ratio of the amt. of a group V atom or molecule to be supplied to the amt. off a group III atom or a molecule contg. the atom to be supplied at the initial growth stage for forming a III-V compd. semiconductor thin film and the same ratio at the time of forming the compd. semiconductor thin film after the initial growth stage to about 50, and the III-V compd. semiconductor thin film 3 is then formed.

5. 发明专利

JPS62189736A EPITAXIAL INSULATING FILM FORMING METHOD FOR SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPS62189736A
公开(公告)日：1987-08-19
申请号：JP3083986
申请日：1986-02-17
申请人： HITACHI LTD
发明人： FUKAZAWA TOKUMI , TAKAGI KAZUMASA , SUSA KENZO , TAKAYAMA TAKANOBU
IPC分类号： C30B29/16 , C30B25/02 , H01L21/314 , H01L21/316
摘要： PURPOSE:To improve the crystallinity of an oxide film by forming in advance an extremely thin rare earth metal film on a semiconductor material substrate before epitaxially growing, oxidizing it to readily epitaxially grow a rare earth element oxide without oxidizing the surface of a substrate. CONSTITUTION:After a vacuum tank 1 is evacuated to 2X10 Pa, metal Eu (europium) is deposited by a deposition source 2 on an Si semiconductor substrate having (100) azimuth of 50mm in diameter. The thin Eu film is amorphous formed under the conditions of 0.08nm/s of depositing speed, 2nm of thickness and 50 deg.C of substrate temperature. O2 is introduced into the tank 1 in this state to set the degree of vacuum to 1.4X10 Pa (1X10 Torr), and the degree of vacuum of the source 2 is maintained by differential evacuation to 4X10 Pa (3X10 Torr). The substrate 3 is heated by a heater 4 to 400 deg.C, held for 10min, and metal Eu is then deposited by the source 2 under the same conditions as those of previously depositing Eu. The formed film obtains europium oxide (Eu2O3) having 200nm of thickness and C-layer earth structure.

6. 发明专利

JPS61123814A Magnetic semiconductor material and optical isolator 失效
标题翻译：磁性半导体材料和光学隔离器
公开(公告)号：JPS61123814A
公开(公告)日：1986-06-11
申请号：JP24444384
申请日：1984-11-21
申请人： Hitachi Ltd
发明人： TAKAGI KAZUMASA , TAKAYAMA TAKANOBU
IPC分类号： G02B27/28 , C22C30/00 , G02F1/09 , H01S5/00
摘要： PURPOSE: To obtain a superior isolator for practically useful laser light causing hardly interposition loss by using a specified Te alloy having the Faraday effect.
CONSTITUTION: An isolator is made of an MnTe-HgTe-CdTe alloy as a magnetic semiconductor having the Faraday effect. It is preferable that the alloy has a composition in the range defined by six points, Mn
0.1 Hg
0.2 Cd
0.7 Te, Mn
0.1 Hg
0.4 Cd
0.5 Te, Mn
0.3 Hg
0.4 Cd
0.3 Te, Mn
0.4 Hg
0.2 Cd
0.4 Te, Mn
0.4 Hg
0.1 Cd
0.5 Te and Mn
0.3 Hg
0.1 Cd
0.7 Te in the MnTe-HgTe-CdTe ternary phase diagram. The magnetic semicon ductor is preferably formed by epitaxial growth on a substrate of a compound semiconductor consisting of group III and V elements such as an InP or GaAs crystal. Semiconductor laser and an optical isolator can be united to one body, and the reliability as optical parts can be increased. A superior isolator for practically useful laser light of 0.8W1.5μm wavelength is obtd.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过使用具有法拉第效应的特定Te合金，获得实际有用的激光的高级隔离器，从而几乎不会导致插入损耗。构成：隔离器由MnTe-HgTe-CdTe合金制成，具有法拉第效应的磁性半导体。优选的是，合金的组成范围为6点，Mn0.1Hg0.2Cd0.7Te，Mn0.1Hg0.4 Cd0.5Te，Mn0.3Hg0.4Cd0.3Te，Mn0.4Hg0.2Cd0.4Te， MnTe-HgTe-CdTe三元相图中Mn0.4Hg0.1Cd0.5Te和Mn0.3Hg0.1 Cd0.7Te。磁半导体管优选通过在由III族和V族元素（例如InP或GaAs晶体）组成的化合物半导体的衬底上外延生长而形成。半导体激光器和光隔离器可以结合到一体，并且可以增加作为光学部件的可靠性。实用有效的0.8-1.5μm波长激光的隔离器是可以实现的。

7. 发明专利

JPH0991660A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER APPLYING THE SAME 失效
公开(公告)号：JPH0991660A
公开(公告)日：1997-04-04
申请号：JP24594095
申请日：1995-09-25
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , HONDA YUKIO , HIRAYAMA YOSHIYUKI , INABA NOBUYUKI , NAKAMURA ATSUSHI , TAKAYAMA TAKANOBU
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/738
摘要： PROBLEM TO BE SOLVED: To obtain a perpendicular magnetic recording medium fit for high density magnetic recording. SOLUTION: A magnetic film and a protective film 104 are laminated on a nonmagnetic substrate 101 directly or via a nonmagnetic underlayer on the substrate 101 and the magnetic film is made of a laminated film consisting of mutually different perpendicularly magnetized films 102, 103. The objective magnetic recording medium ensuring low medium noise and having high reproduction output is obtd.

8. 发明专利

JPH08249601A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH08249601A
公开(公告)日：1996-09-27
申请号：JP4524895
申请日：1995-03-06
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAKAYAMA TAKANOBU , YOSHIDA KAZUYOSHI , SUZUKI MIKIO , MARUYAMA YOJI , HIRAYAMA YOSHIYUKI , FUTAMOTO MASAAKI , HONDA YUKIO
IPC分类号： G11B5/66 , G11B5/02 , G11B5/127 , G11B5/64
摘要： PURPOSE: To obtain a magnetic recording device with an improved reproduction output/medium noise ratio. CONSTITUTION: A ring-type magnetic head is used for a magnetic recording medium with vertical magnetic anisotropy or oblique direction magnetic anisotropy to record information magnetically. A magnetic recording medium is a thin-film magnetic recording medium 1 and the density of the constituent in vertical direction of a magnetic flux generated from a magnetic pole at the front edge side of a ring-type magnetic head 2 is larger than that of a constituent in vertical direction of a magnetic flux generated from a rear-edge- side magnetic pole, thus obtaining a high reproduction output/medium noise ratio with a high line recording density of 150kFCI or larger.

9. 发明专利

JPH087250A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE USING THIS MEDIUM 失效
公开(公告)号：JPH087250A
公开(公告)日：1996-01-12
申请号：JP13157194
申请日：1994-06-14
申请人： HITACHI LTD
发明人： TANAHASHI KIWAMU , TAKAYAMA TAKANOBU , HOSOE YUZURU , FUTAMOTO MASAAKI
IPC分类号： G11B5/66 , G11B5/02 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/85
摘要： PURPOSE:To obtain a magnetic recording medium using a smooth substrate and having high intransurface magnetic anisotropy,and high coercive force and a magnetic storage device using the medium. CONSTITUTION:When a nonmagnetic underlayer 12, a magnetic layer 13 and a protective layer 14 are successively laminated on a nonmagnetic substrate 11 to obt.ain a magnetic recording medium, the substrate 11 is made of a substrate of glass, carbon, silicon, etc., having a smooth surface, the angle of inclination of columnar grains constituting the underlayer 12 is regulated to the range of 20-50 deg. from the normal direction of the substrate 11 and the ratio (t1/t2) of the thickness (t1) of the magnetic layer 13 to the thickness (t2) of the underlayer 12 is regulated to

10. 发明专利

JPH07307020A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH07307020A
公开(公告)日：1995-11-21
申请号：JP9677994
申请日：1994-05-10
申请人： HITACHI LTD
发明人： FUTAMOTO MASAAKI , HIRAYAMA YOSHIYUKI , TAKAYAMA TAKANOBU , INABA NOBUYUKI , YAMAMOTO TOMOO , NAKAMURA ATSUSHI , HONDA YUKIO , HOSOE YUZURU
IPC分类号： G11B5/66 , G11B5/65 , G11B5/738
摘要： PURPOSE:To obtain an intrasurface magnetic recording medium improved that it is made to fit for high density magnetic recording. CONSTITUTION:A 1st underlayer 102 having a (100) oriented Nail type crystal structure is formed on a nonmagnetic base substrate 101, microscopic ruggedness 103 is imparted to the surface of the underlayer 102 and a 2nd underlayer 104 having a bcc structure is formed on the underlayer 102. A magnetic film 105 of a Co-based alloy having an hcp structure is then formed on the underlayer 104. Recording-resolving power is improved by imparting magnetic anisotropy to the magnetic film and sliding resistance can also be improved.

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