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61. 发明专利

JPH01217713A MAGNETIC HEAD AND ITS MANUFACTURE AND MAGNETIC RECORDING AND REPRODUCING DEVICE USING MAGNETIC HEAD 失效
公开(公告)号：JPH01217713A
公开(公告)日：1989-08-31
申请号：JP3939088
申请日：1988-02-24
申请人： HITACHI LTD
发明人： OTOMO MOICHI , KUMASAKA TAKAYUKI , SHIIKI KAZUO , YAMASHITA TAKEO , SASAKI SHINOBU , TARUYA YOSHINOBU
IPC分类号： G11B5/127 , G11B5/33
摘要： PURPOSE:To obtain a reproducing magnetic head having high sensitivity by detecting flux generated from a recording medium approximately arranged in parallel by rings composed of a superconducting material including a Josephson junction. CONSTITUTION:A magnetic head is basically composed of superconducting rings 1 composed of the superconducting material, a Josephson junction 2 to join the superconducting rings, and a through hole 3 formed by the superconducting rings. When an opposite surface 6 of a recording medium and a recording medium 7 are arranged opposite to each other, and the flux generated from the recording medium 7 is made to pass through the through hole 3, a current to flow through a conductor 4 is changed according to the quantity of the flux to pass, and the quantity of the flux can be detected. When the quantity of the flux to pass through the through hole 3 is at least 1X10 Wb here, a reproducing signal can be detected sufficiently. Thus, it becomes possible to compose the reproducing magnetic head having the high sensitivity.

62. 发明专利

JPH01132109A FERROMAGNETIC THIN FILM AND MAGNETIC HEAD EMPLOYING SAME 失效
公开(公告)号：JPH01132109A
公开(公告)日：1989-05-24
申请号：JP28931387
申请日：1987-11-18
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI , SAITOU NORITOSHI
IPC分类号： H01F10/14 , C22C38/00 , C22C38/08 , G11B5/127 , G11B5/31
摘要： PURPOSE:To produce a ferromagnetic thin film which has a low magnetostrictive constant, a high saturation magnetic flux density, a high permeability and high corrosion resistance, and a magnetic head employing the same for high density magnetic recording, by employing the thin film which contains a specific amounts of Ni, specific amounts of one or more kinds of elements selected from the group consisting of B, C and N, respectively, and the balance Fe, and so forth. CONSTITUTION:The ferromagnetic thin film is employed which contains 0.5-2.6wt.% Ni, 0.1-5wt.% one or more kinds of elements selected from the group consisting of B, C and N, and the balance Fe. Or, the thin film is employed which contains 0.5-2.6wt.% Ni, 0.1-3wt.% one or more kinds of elements selected from the group consisting of Al., Si, P, Ga, Ge, As, In, Sn, Sb, Zn, Cu, Co, Mn, Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf, Y, Au and Ag, and the balance Fe, or which contains 0.5-2.6wt.% Ni, 0.1-3wt.% one or more kinds of elements selected from said group consisting of Al, Si, P and the like, 0.1-5wt.%, one or more kinds of elements selected from the group consisting of B, C and N, and the balance Fe.

63. 发明专利

JPS6464113A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6464113A
公开(公告)日：1989-03-10
申请号：JP22013687
申请日：1987-09-04
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI , SHIROISHI YOSHIHIRO , MATSUDA YOSHIFUMI , HISHIYAMA SADAO , OONO TADAYUKI , SUZUKI HIROYUKI
IPC分类号： G11B5/706 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738
摘要： PURPOSE:To provide a thin magnetic film having a high saturation magnetic flux density and high corrosion resistance so that high-density magnetic recording is enabled by forming a magnetic layer of the thin film consisting of a specific alloy having specific crystal lattice and orienting the specific face in parallel with the substrate plane. CONSTITUTION:The magnetic layer formed on a nonmagnetic substrate is constituted of the thin alloy film of Fe or the alloy essentially consisting of Fe. This thin film is so formed as to have the crystal lattice of a body centered cubic structure and is so oriented that the face (110) of the cubic structure parallels with the substrate plane. The atomic density on the surface of the thin film is increased and the thin magnetic film having the high saturation magnetic flux density and high corrosion resistance is obtd. by paralleling the face (110) of the densest face with the substrate plane. As a result, the high-density magnetic recording is executed.

64. 发明专利

JPS63293802A LAMINATED MAGNETIC THIN FILM AND MAGNETIC HEAD USING THE SAME 失效
公开(公告)号：JPS63293802A
公开(公告)日：1988-11-30
申请号：JP12811287
申请日：1987-05-27
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI , SAITOU NORITOSHI
IPC分类号： G11B5/31 , G11B5/127 , H01F10/00
摘要： PURPOSE:To improve efficiency such as of a low magnetostriction constant and the like of the title thin film by a method wherein a lamination structure is formed on the alloy thin film mainly composed of Fe thin film or Fe through the intermediary of an Fe-Ni alloy thin film, and the thickness of a cycle of the laminated structure is set at 170-1000 Angstrom . CONSTITUTION:A laminated magnetic thin film is constructed in such a manner that an Fe main magnetic film 31 and a permalloy intermediate layer 32 are deposited alternately on a substrate 33. On the magnetic thin film, which is obtained by forming the Fe main magnetic film 31 into lamination type through the intermediary of the permalloy intermediate layer 32, magnetostriction constant increases as its number of layer increases. When the total film thickness of the laminated magnetic thin film is 5000 Angstrom , it is necessary to laminate 5-30 layers, namely, one cycle of lamination structure is to be brought in the range of about 170-1000 Angstrom in order to obtain the magnetostriction constant in the range of -2X10 -2X10 . As a result, low coercive force and high permeability can be obtained.

65. 发明专利

JPS63197307A FERROMAGNETIC THIN FILM AND MAGNETIC HEAD USING SAME 失效
公开(公告)号：JPS63197307A
公开(公告)日：1988-08-16
申请号：JP2823087
申请日：1987-02-12
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI , SAITOU NORITOSHI
IPC分类号： C22C38/00 , C22C38/12 , G11B5/127 , G11B5/31 , H01F10/14
摘要： PURPOSE:To obtain excellent recording characteristics by a method wherein the ferromagnetic thin film to be used for a magnetic head is composed in such a manner that the weight ratio of the W, Cr and Mo for the entire thin film satisfies the specific formula mentioned separately, and the remaining part consists of Fe. CONSTITUTION:The ferromagnetic thin film to be used for a part of a magnetic head is composed of an Fe-W alloy, and when the weight percent of W, Cr and Mo of the ferromagnetic thin film against the entire ferromagnetic thin film is set at x, y and z where 4/9

66. 发明专利

JPS63177404A LAMINATED AMORPHOUS MAGNETIC FILM AND MAGNETIC HEAD USING SAME 失效
公开(公告)号：JPS63177404A
公开(公告)日：1988-07-21
申请号：JP802287
申请日：1987-01-19
申请人： HITACHI LTD
发明人： HAMAKAWA YOSHIHIRO , SHIIKI KAZUO , OTOMO MOICHI , SAITOU NORITOSHI , KUMASAKA TAKAYUKI
IPC分类号： G01B7/00 , G01D5/245 , G11B5/31 , H01F10/12 , H01F10/13 , H01F10/32
摘要： PURPOSE:To obtain an amorphous alloy film having high saturated magnetic flux density, excellent thermal stability and approximately zero of magnetostrictive constant by setting the crystallizing temperature of a first amorphous film higher than that of a second amorphous film in a composite amorphous film which has the first amorphous film as a base film and the second amorphous film as a main magnetic film. CONSTITUTION:In a laminated amorphous film which has a first amorphous film as a base film 2 and a second amorphous film as a main magnetic film 3, the crystallizing temperature Tx1 of the film 2 is larger than that Tx2 of the film 3. The film 3 may be of an Fe amorphous film or a Co amorphous film, but the Co amorphous film causes a larger effect. The film 2 may be of a ferromagnetic film containing different element from that of a nonmagnetic film or the film 3. However, it is desired to compose the films 2, 3 of the same elements in view of the bondability of the film 2 to the film 3 and the chemical stability thereof. The thickness of the film 2 is suitably 30-500Angstrom .

67. 发明专利

JPS63175213A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS63175213A
公开(公告)日：1988-07-19
申请号：JP482087
申请日：1987-01-14
申请人： HITACHI LTD
发明人： TAKANO KOJI , HAMAKAWA YOSHIHIRO , SHIIKI KAZUO , OTOMO MOICHI , KUMASAKA TAKAYUKI
IPC分类号： G01B7/00 , G01D5/245 , G11B5/31
摘要： PURPOSE:To improve recording and reproducing efficiency by forming either of an upper magnetic layer and lower magnetic layer of a crystalline Fe alloy film and forming the upper or lower layer or both the upper and lower layers of the crystalline Fe alloy film of a metallic or alloy film except Fe. CONSTITUTION:The upper magnetic pole 1 and lower magnetic pole 2 of a magnetic head are respectively formed of an Fe alloy which is a high saturation magnetic flux density material. The upper or lower layer of the alloy or both said layers are formed of the metal or alloy. The metal or alloy films provided to the upper magnetic pole 1 and lower magnetic pole 2 of this embodiment are formed to avoid the direct contact of the crystalline Fe alloy film with a polyimide resin layer (PIQ) which is an insulating layer or SiO, Al2O3, etc. forming a gap layer. Said films have the effect of preventing the reaction of the PIQ and Fe alloy in a high-temp. process and the exfoliation of the SiO2, Al2O3, etc., formed on the Fe alloy. The recording and reproducing efficiency are thereby improved.

68. 发明专利

JPS63119210A AMORPHOUS MAGNETIC FILM AND MAGNETIC HEAD 失效
公开(公告)号：JPS63119210A
公开(公告)日：1988-05-23
申请号：JP26372186
申请日：1986-11-07
申请人： HITACHI LTD
发明人： HAMAKAWA YOSHIHIRO , SHIIKI KAZUO , SAITOU NORITOSHI , OTOMO MOICHI , KUMASAKA TAKAYUKI
IPC分类号： G01B7/00 , G01D5/245 , G11B5/31 , H01F10/12 , H01F10/13 , H01F10/30
摘要： PURPOSE:To obtain an amorphous alloy film having high saturation magnetic flux density, excellent thermal stability and a magnetostriction constant of approximately zero and a magnetic head using said amorphous alloy film by forming a metallic foundation film between the Co group amorphous alloy film and a substrate. CONSTITUTION:A metallic foundation film 2 is shaped between a Co group amorphous alloy film 3 mainly comprising Co and a substrate 1. It is preferable that the metallic foundation film 2 consists of either one kind of a metal or two kinds or more of alloys of Zr, Ta, W, Nb and Mo. It is desirable that the metallic foundation film is constituted of at least one kind of the metal or two kinds or more or alloys of additional elements except Co of a Co group amorphous alloy from the point of chemical stability in the amorphous film having chemical formula CoaZrbTc (T=Zr, Ta, W, Nb, Mo...). Zr having the highest amorphous forming capacity of the Co group alloy is the most preferable among them. It is desirable that the film thickness of the metallic foundation film ranges from 30Angstrom to 500Angstrom .

69. 发明专利

JPS6374115A FLOATING TYPE MAGNETIC HEAD AND ITS PRODUCTION 失效
公开(公告)号：JPS6374115A
公开(公告)日：1988-04-04
申请号：JP21712386
申请日：1986-09-17
申请人： HITACHI LTD
发明人： KUMASAKA TAKAYUKI , OTOMO MOICHI , YAMASHITA TAKEO , SAITOU NORITOSHI , SAITO SUKEO , SAKURAI HIROSHI
IPC分类号： G01B7/00 , G01D5/245 , G11B5/105 , G11B5/127 , G11B5/187 , G11B5/60
摘要： PURPOSE:To simplify the manufacturing process and to attain mass production of floating type magnetic heads by burying a magnetic head core into a groove formed at the side face of a floating/sliding surface of a floating member and therefore reducing the number of junction processes of glass, etc., down to just one. CONSTITUTION:A rectangular nonmagnetic block 50 serving as a floating member 31 contains a groove 52 where magnetic head cores 33 and 33' are buried. Then a magnetic material to be used to cores 33 and 33' is stacked in the groove 52 by a thin film production process and the undesired part of the magnetic material is removed. This magnetic film 53 is divided into two core half blocks 54 and 55 approximately at the center part and in the film thickness direction. Then a coil winding groove 57 is formed at least at one of two counter faces of a magnetic gap between blocks 54 and 55 and a desired nonmagnetic film is formed at the groove 57. Both blocks 54 and 55 are integrated in a single body connecting both butting faces with pressure and heating. Then this integrated body is cut into blocks. A groove 63 is formed to the counter surface of said block against a recording medium with a prescribed floating surface 62 left. Then a cut groove 64 is formed to show a coil winding window and the surface 62 is processed. Thus a floating type magnetic head is obtained.

70. 发明专利

JPS6310306A MAGNETIC HEAD 失效
公开(公告)号：JPS6310306A
公开(公告)日：1988-01-16
申请号：JP15401586
申请日：1986-07-02
申请人： HITACHI LTD
发明人： KUMASAKA TAKAYUKI , OTOMO MOICHI , YAMASHITA TAKEO , SAITOU NORITOSHI
IPC分类号： G11B5/127 , G11B5/187 , G11B5/31
摘要： PURPOSE:To improve recording and reproducing efficiency and to decrease noise by forming an auxiliary magnetic pole of a magnetic metallic material, decreasing the volume to be occupied by the auxiliary magnetic pole and using nonmagnetic protective substrates to form a magnetic core substrate part. CONSTITUTION:Materials such as zirconia, sapphire, and alumina tartanic acid carbide having a good characteristic to resist sliding with a recording medium are used for the nonmagnetic protective substrates 31, 31'. A groove is formed to the nonmagnetic protective substrate 31 to be formed with a main magnetic pole and a soft magnetic material is packed therein. The main magnetic pole 33 having a high saturation magnetic flux density is formed on the soft magnetic material 32 to constitute a main magnetic pole core. The auxiliary magnetic pole 30' forms a groove 35 for coil winding on another nonmagnetic protective substrate 31, and forms the soft magnetic film 34 serving as the auxiliary magnetic pole on the circumferential wall of the groove. The soft magnetic film 34 is formed by sputtering or vapor deposition, etc., of a 'Permalloy(R)', 'Sendust(R)' or amorphous magnetic alloy. The main magnetic pole 30 and the auxiliary magnetic pole 30' are butted to each other and are joined and united by a resin or glass by which a magnetic head core is formed.

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