公开(公告)号：DE3060691D1

公开(公告)日：1982-09-16

申请号：DE3060691

申请日：1980-03-27

Applicant: IBM

Inventor： MELCHER ROBERT LEE ,  ROMANKIW LUBOMYR TARAS ,  VON GUTFELD ROBERT JACOB

IPC: H05K3/06 ,  B23K26/12 ,  C23F1/02 ,  C23F4/00 ,  C25F3/14 ,  H01L21/306 ,  H01L21/3213 ,  H05K3/22 ,  B23K26/00

Abstract: A method for high resolution maskless chemical and electrochemical machining is described. Preferential etching results from exposing those regions where machining is sought to an energy beam. Such exposures can increase the ething rate in the case of electrochemical machining by a factor of 103 to 104. Such enhancement is sufficient to make masking unnecessary.

公开(公告)号：DE2758147A1

公开(公告)日：1978-07-13

申请号：DE2758147

申请日：1977-12-27

Applicant: IBM

Inventor： CASTELLANI EUGENE EVANS ,  POWERS JOHN VINCENT ,  ROMANKIW LUBOMYR TARAS

IPC: C25D7/00 ,  C25D3/56 ,  C25D5/08 ,  C25D17/00 ,  C25D21/12 ,  G11B5/31 ,  G11B5/858 ,  H01F10/14 ,  H01F41/14 ,  H01F41/26 ,  C25D3/12 ,  C25D3/20

Abstract: A thin film of low magnetostriction Permalloy 80% nickel - 20% iron +/- 1% is electroplated in a bath having a ratio of about 1.8:1 to 24:1 g/liter ratio of Ni to Fe ions with a plating current density from 10 ma/cm2 - 200 ma/cm2 when plating in sheet form or an Ni/Fe ratio of 25:1 to 85:1 with a current density of 2 ma/cm2 - 110 ma/cm2 when plating through a mask. The fluid in the system is constantly mixed, replenished with fresh iron, acid, and other reagents, is adjusted in temperature and subjected to a continuous laminar regime of mixing. Fresh solution is added to the bath from a reservoir where the above adjustments are made. The inlet for the fresh solution is at the lower end of the plating chamber and directed at a bath mixer which includes a slot through which the fresh solution is directed to optimize mixing in the plating chamber. Complexing agents are avoided. High speed plating is obtained with about 24.4 g/l of Ni++, 1.05 g/l of Fe++, 25 g/l of H3BO3, 0.2 g/l of Na saccharin and a pH of 1.5 to 3.6.

公开(公告)号：DE2645081A1

公开(公告)日：1977-07-14

申请号：DE2645081

申请日：1976-10-06

Applicant: IBM

Inventor： ROMANKIW LUBOMYR TARAS

IPC: H05K3/14 ,  C23C14/04 ,  G03F7/26 ,  H01L21/28 ,  H01L21/306 ,  H01L21/3205 ,  H05K3/02 ,  H01F10/00 ,  H01L21/02 ,  H01L21/308 ,  H01L21/467 ,  H01L39/24

公开(公告)号：DE2527934A1

公开(公告)日：1976-03-04

申请号：DE2527934

申请日：1975-06-23

Applicant: IBM

Inventor： ROMANKIW LUBOMYR TARAS

IPC: G11B5/11 ,  G11B5/265 ,  G11B5/31 ,  G11B5/39 ,  G11B5/30

Abstract: A thin film head includes a permeable substrate providing a first shield, which may include a more highly permeable layer on its upper surface for shielding, a layer of permeable material thereon providing a second shield and a first write head leg referred to as the shielding-leg layer and a magnetic gap filled with dielectric material between the substrate and the shielding-leg layer. A magnetoresistive stripe including permeable material extends within the dielectric in said gap near the tip end of the head spaced from the substrate and the shielding-leg layer. An inductive single turn or multiturn writing winding is formed upon a layer of dielectric on the other side of the shielding-leg layer. A second leg layer covers the half of the spiral winding towards the tip end of the head and extends through an opening into contact with the shielding-leg layer.

公开(公告)号：AU6270973A

公开(公告)日：1975-05-22

申请号：AU6270973

申请日：1973-11-20

Applicant: IBM

Inventor： ROMANKIW LUBOMYR TARAS ,  THOMPSON DAVID ALEXANDER ,  BAJOREK CHRISTOPHER HENRY

IPC: G01R33/02 ,  G01R33/09 ,  G11B5/39 ,  G11C11/14 ,  H01F10/08 ,  H01F10/32 ,  H04R15/00 ,  G11B5/30

Abstract: 1450204 Magnetic heads INTER. NATIONAL BUSINESS MACHINES CORP 9 Nov 1973 [29 Dec 1972] 52064/73 Heading G5R [Also in Division H3] A magnetic sensing head comprises a unitary structure of a layer of magneto-resistive material 16 for sensing a magnetic field and an adjacent biasing layer 14 of permantly magnetized material to bias the layer 16 magnetically to a required operating range, layers 14 and 16 being in direct contact with one another. The layers 14 and 16 may be co-planar or laminated, with the direction of magnetization, arrow M h , of bias layer 14 parallel or perpendicular to the easy axis and sense current direction, arrow I, of layer 16. Layer 16 is of permalloy material, e.g. Ni-Fe, Ni-Co or Ni-Fe-Co, and the bias layer 14 may be of ferrite. Layers 14,16, may be evaporated, sputtered or electroplated on a substrate 12 with thicknesses of 200 to 2000 and 50 to 400 Šngstroms respectively. The bias may be established due to exchange or epitaxially coupled layers 14, 16, there being direct atomic contact between the layers. In another form the biasing layer 14 is a composite layer comprising exchange or epitaxially coupled films with a magnetically soft film atomically coupled to a magnetically hard film, e.g. Ni-Fe deposited on a Fe 2 O 3 , a Fe 2 O 3 on Ni-Fe, Co or Co-rich Ni-Co on vanadium or chromium, or binary Co-P. In a further form, the bias layer, or two bias layers with the sensing layer therebetween, is or are formed by preferentially oxiding one or both surfaces of a permalloy sensor strip. Alternatively such surfaces may have localized zones with a raised coercivity produced by chemical reaction with chlorides or sulphates, etching to roughen the surfaces, or by selective deposition of materials which exchange couple to the sensing layer. The combined sensing and bias layers may be surrounded by a magnetic shield (8) in a record head, Fig. 1 (not shown). The head may be used for reading tapes, discs, magnetic ink, or sheets capable of generating and transporting magnetic bubble domains.

公开(公告)号：DE2363123A1

公开(公告)日：1974-07-18

申请号：DE2363123

申请日：1973-12-19

Applicant: IBM

Inventor： BAJOREK CHRISTOPHER HENRY ,  ROMANKIW LUBOMYR TARAS ,  THOMPSON DAVID ALEXANDER

IPC: G01R33/02 ,  G01R33/09 ,  G11B5/39 ,  G11C11/14 ,  H01F10/08 ,  H01F10/32 ,  G11B5/12

Abstract: 1450204 Magnetic heads INTER. NATIONAL BUSINESS MACHINES CORP 9 Nov 1973 [29 Dec 1972] 52064/73 Heading G5R [Also in Division H3] A magnetic sensing head comprises a unitary structure of a layer of magneto-resistive material 16 for sensing a magnetic field and an adjacent biasing layer 14 of permantly magnetized material to bias the layer 16 magnetically to a required operating range, layers 14 and 16 being in direct contact with one another. The layers 14 and 16 may be co-planar or laminated, with the direction of magnetization, arrow M h , of bias layer 14 parallel or perpendicular to the easy axis and sense current direction, arrow I, of layer 16. Layer 16 is of permalloy material, e.g. Ni-Fe, Ni-Co or Ni-Fe-Co, and the bias layer 14 may be of ferrite. Layers 14,16, may be evaporated, sputtered or electroplated on a substrate 12 with thicknesses of 200 to 2000 and 50 to 400 Šngstroms respectively. The bias may be established due to exchange or epitaxially coupled layers 14, 16, there being direct atomic contact between the layers. In another form the biasing layer 14 is a composite layer comprising exchange or epitaxially coupled films with a magnetically soft film atomically coupled to a magnetically hard film, e.g. Ni-Fe deposited on a Fe 2 O 3 , a Fe 2 O 3 on Ni-Fe, Co or Co-rich Ni-Co on vanadium or chromium, or binary Co-P. In a further form, the bias layer, or two bias layers with the sensing layer therebetween, is or are formed by preferentially oxiding one or both surfaces of a permalloy sensor strip. Alternatively such surfaces may have localized zones with a raised coercivity produced by chemical reaction with chlorides or sulphates, etching to roughen the surfaces, or by selective deposition of materials which exchange couple to the sensing layer. The combined sensing and bias layers may be surrounded by a magnetic shield (8) in a record head, Fig. 1 (not shown). The head may be used for reading tapes, discs, magnetic ink, or sheets capable of generating and transporting magnetic bubble domains.