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公开(公告)号：FR2353650A1
公开(公告)日：1977-12-30
申请号：FR7703518
申请日：1977-02-01
Applicant: IBM
Inventor： SCHWARTZ BRADFORD C , SILKENSEN RALPH D , STEVING GERALD
Abstract: During formation of a smooth (roughness 250 A) electroinsulating layer on a polycrystalline, monocrystalline or amorphous substrate (roughness is not >500 angstroms) by high-frequency cathodic sputtering, a part of the deposited material (re-emission coefft.) is removed by the ion bombardment with the loss of a part of the electric energy. The process is improved by forming a first layer of the insulating material at an energy loss coefft. of =1:12 or less (pref, between 1:12-35) and a re-emission coefft. of =0.35 (pref. 0.35-0.15); and then a second layer of the insulating material at an energy loss coefft. of >=1:5 (pref. 1:5-1.5), and a re-emission coefft. of >=0.6 (pref. 0.6-0.8). Different surfaces can be smoothly coated. This is of special importance whom a very thin magnetic layer is to be applied onto the insulating layer, as the properties of such magnetic layers greatly depend on the smoothness of the substrate (e.g. in magnetic heads).
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公开(公告)号：DE69213558D1
公开(公告)日：1996-10-17
申请号：DE69213558
申请日：1992-04-30
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD BIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：DE2749696A1
公开(公告)日：1978-06-08
申请号：DE2749696
申请日：1977-11-07
Applicant: IBM
Inventor： CARLSON JEFFREY ALLEN , SCHWARTZ BRADFORD CLYDE , STEVING GERALD
IPC: C09J7/02 , B23K1/19 , B23K1/20 , B23K20/22 , B23K35/00 , B29C63/00 , B32B37/00 , C04B37/00 , C09J5/00 , G02F1/11 , H01L41/00 , H01L41/047 , H01L41/22 , B23K21/00
Abstract: A method of bonding two crystals together is disclosed. A bond enhancing material such as chromium (Cr) is vapor deposited on one crystal, and on this is vapor deposited a noble metal such as gold (Au). On the other crystal a low melting point metal such as tin (Sn) or indium (In) is vapor deposited. In the case of In this can either be directly on the crystal or on a layer of bond enhancing material; in the case of Sn this must be on a bond enhancing material. On top of the low melting point metal a layer of the same noble metal is deposited to prevent oxidation thereof. The noble metal layers are brought into contact with each other in vacuum or inert atmosphere and pressure applied thereto at a temperature of 100 DEG C to 150 DEG C in the case of In and 100 DEG C to 200 DEG C in the case of Sn. The low melting point metal will diffuse into the noble metals and across the interface causing a bond to form by elimination of the boundary between the crystals.
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公开(公告)号：DE69213558T2
公开(公告)日：1997-03-13
申请号：DE69213558
申请日：1992-04-30
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD BIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：CA1078331A
公开(公告)日：1980-05-27
申请号：CA258911
申请日：1976-08-11
Applicant: IBM
Inventor： SCHWARTZ BRADFORD C , SILKENSEN RALPH D , STEVING GERALD
IPC: C23C15/00
Abstract: RF BIAS SPUTTERING METHOD FOR PRODUCING INSULATING FILMS FREE OF SURFACE IRREGULARITIES Using this method an insulating film substantially free from surface irregularities is RF bias sputtered onto a smooth polycrystalline or micro-roughened surface. This is accomplished by controlled resputtering at a first low ratio and then, after a substantially continuous layer of insulative amorphous film is deposited over the substrate, increasing the resputtering to a second higher ratio.
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Patent Agency Ranking
公开(公告)号：HK210996A
公开(公告)日：1996-12-06
申请号：HK210996
申请日：1996-11-28
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD BIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：CA1127300A
公开(公告)日：1982-07-06
申请号：CA341315
申请日：1979-12-06
Applicant: IBM
Inventor： BASSETT ROGER D , MCCORMICK WAYNE , DAUGHENBAUGH GERALD A , FIELDS DAVIS S JR , POLLEYS RHODES W , SILKENSEN RALPH D , STEVING GERALD
IPC: G11B5/30
Abstract: WEAR RESISTANT MAGNETORESTRICTIVE HEAD An MR head is disclosed in which the MR element is deposited onto a sapphire substrate with a particular crystallographic orientation and a sapphire closure piece also having a particular crystallographic orientation is used. The substrate has the MR element deposited onto either the {0001} or the {1120} plane with -the {1100} plane being oriented as the wear surface. The closure piece has either the {1120} or the {0001} plane facing the MR material and the {1100} plane oriented as the wear surface. BO978058
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公开(公告)号：DE2635667A1
公开(公告)日：1977-03-03
申请号：DE2635667
申请日：1976-08-07
Applicant: IBM
Inventor： SCHWARTZ BRADFORD CLYDE , SILKENSEN RALPH DONALD , STEVING GERALD
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公开(公告)号：CA2064641C
公开(公告)日：1998-09-22
申请号：CA2064641
申请日：1992-04-01
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording can have a poletip enhanced by providing a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate. The second pole piece is a thin film of the soft magnetic material. A closure block of a non-magnetic ceramic encloses the layers together with leveling insulation layers and a deposited activating conductor turns. The stripe poletip deposited onto the magnetic ferrite extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：CA2054579C
公开(公告)日：1995-09-26
申请号：CA2054579
申请日：1991-10-31
Applicant: IBM
Inventor： DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STERN GUSTAVE CHRISTIAN , STEVING GERALD , ZAMMIT ROBERT PAUL
Abstract: An interleaved head is disclosed for reading and writing data transitions onto a magnetic tape. A magnetic recording system is disclosed for the bi-directional transportation of the tape media across the interleaved head. A controller controls the tape drive in a reel-to-reel format to accomplish the bi-directional motion of the tape media. The interleaved head includes two modules with each module having a plurality of alternating read and write transducers alternately spaced apart along a single line placed transverse to the movement of the magnetic tape. The two modules are placed together such that the write gaps of one module are aligned with the read gaps of the other module. Each read module includes the magneto-resistive element. Each write transducer includes a thin film conductor driving a nickel zinc ferrite substrate as one pole piece and a nickel zinc closure piece as the second pole piece. In order to provide leveling across the write transducers of the module, write back gap islands are provided in the back gap regions of the write transducer made of the same material with the same thickness as the magneto resistive element and the conductors interconnecting the magneto resistive element to the read/write network of the tape drive.
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