公开(公告)号：CA1068412A

公开(公告)日：1979-12-18

申请号：CA265857

申请日：1976-11-16

Applicant: IBM

Inventor： BAJOREK CHRISTOPHER H ,  HEMPSTEAD ROBERT D ,  KRONGELB SOL ,  MAYADAS ASHOK F

IPC: G11B5/39 ,  G11B5/30 ,  H01H39/00

Abstract: MAGNETORESISTIVE SANDWICH INCLUDING SENSOR ELECTRICALLY PARALLEL WITH ELECTRICAL SHUNT AND MAGNETIC BIASING LAYERS A magnetoresistive Permalloy* film is deposited upon a substrate and coated with a separating layer composed of titanium or a similar high resistivity, conductive material. A soft biasing layer of a material such as Permalloy* or a hard biasing material such as cobalt chromium is deposited upon the separting layer to complete a sandwich. All layers are coextensive in outline because their outlines are formed by a single etching step.

公开(公告)号：DE2827429A1

公开(公告)日：1979-01-11

申请号：DE2827429

申请日：1978-06-22

Applicant: IBM

Inventor： HEMPSTEAD ROBERT DOUGLAS ,  KRONGELB SOL ,  NEPELA DANIEL ANDREW ,  THOMPSON DAVID ALLEN ,  VALSTYN ERICH PHILLIPP

IPC: G11B5/31 ,  G11B5/39 ,  H01F10/00 ,  H01F10/08 ,  H01F10/12 ,  H01F10/18 ,  H01F10/32 ,  H01F41/14 ,  H01L43/08 ,  H01F10/02 ,  G11B5/12

公开(公告)号：CA960360A

公开(公告)日：1974-12-31

申请号：CA184355

申请日：1973-10-26

Applicant: IBM

Inventor： BAJOREK CHRISTOPHER H ,  KRONGELB SOL ,  MAYADAS ASHOK F

IPC: G11C11/14 ,  G01R33/09 ,  G11B5/39 ,  G11B5/72 ,  G11C19/08 ,  H01C1/034 ,  H01C10/10 ,  H01F41/32 ,  H01L43/08

Abstract: 1391150 Magnetic heads INTERNATIONAL BUSINESS MACHINES CORP 12 Oct 1973 [30 Nov 1972] 47709/73 Heading G5R [Also in Division H3] Decrease of sensitivity due to oxidization of a magnetoresistive thin film magnetic bubble sensor or magnetic tape reading head is prevented by an overlay of Al 2 O 3 or Si 3 N 4 . The magnetoresistive material may be permalloy, or an alloy of Ni-Fe, Ni-Fe-Co, Ni-Co or Fe-Co, and have a thickness of between 200Š and 1000Š. The overlay may be of twice this thickness. As applied to sensing magnetic bubbles 4, Fig. 1, in a magnetic plate 2, the sensor consists of a permalloy element 10 having an easy axis of magnetization in the direction of current flow from a source 12 through the element. The presence of a magnetic bubble changes the element resistance which is detected by the change of voltage across the source. A layer of a dielectric material S and a sputtered layer 18 of Al 2 O 3 or Si 3 N 4 extend over the magnetic plate and the magnetoresistive element. Similar layers are applied over the reading head 20, Fig. 2, of a moving magnetic tape 22, the magnetoresistive sensor 10 being similar to that shown in Fig. 1.