EP0221540A2
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EP
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Magnetic transducer head utilizing magnetoresistance effect
Assignee: Sony Corp
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Filing: 1986-11-04
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Granted: —
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Expires: 2006-11-04
Abstract
Abstract In the MR magnetic head of the present invention, its sensing element (2) comprises a plurality of superposed magnetic layers (4,5) having magnetoresistance effect in at least one of them and a nonmagnetic intermediate layer (3) sandwiched therebetween, and a sensing current (i) is fed to flow in the sensing element (2) in the same direction as a signal magnetic field applied to the element. Each of the magnetic layers (4,5) is so formed as to have an easy axis of magnetization substantially perpendicular to the signal magnetic field or to have an isotropic magnetic characteristic in the magneticfilm plane, thereby avoiding generation of Barkhausen noise with certainty.
Inventors
- 👤 Hiroshi Takino
- 👤 Shigeyoshi Imakoshi
- 👤 Nobuhiro Terada
- 👤 Norio Saito
- 👤 Hideo Suyama
- 👤 Kenichiro Tsunewaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 09:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3916; G11B5/3919; G11B5/3922; G11B5/3925; G11B5/3929; G11B5/3935; G11B5/3941; G11B5/3945; G11B5/3948; G11B5/3951; G11B5/3954; G11B5/3958; G11B5/3961; G11B5/3964; G11B5/398; G11B5/399; G11B5/31; G11B5/3109; G11B5/313; G11B5/3143; G11B5/3146; G11B5/3153; G11B5/3156
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
152 words
A magnetic transducer head utilizing magnetoresistance effect comprising: a sensing element (2) composed of first and second soft magnetic layers (4,5) superposed having a non magnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having ma g netoresistance effect and said first and second soft magnetic layers being magnetostatically coupled through said non magnetic layer, a pair of electrodes (9B,9F) being connected to said sensing element (2) at first and second end portions of said sensing element to flow a sense current (i) through said sensing element along one direction between said first and second end portions, said sensing element receiving signal magnetic field parallel to said one direction, and said soft magnetic layers (4,5) having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristic in a major surface of said soft magnetic layers.
Claim 2
Dependent Claim
152 words
A magnetic transducer head utilizing magnetoresistance effect comprising: a sensing element (2) composed of first and second soft magnetic layers (4,5) superposed having a non magnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having ma g netoresistance effect and said first and second soft magnetic layers being magnetostatically coupled through said non magnetic layer, a pair of electrodes (9B,9F) being connected to said sensing element (2) at first and second end portions of said sensing element to flow a sense current (i) through said sensing element along one direction between said first and second end portions, said sensing element receiving signal magnetic field parallel to said one direction, and said soft magnetic layers (4,5) having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristic in a major surface of said soft magnetic layers.
Claim 3
Dependent Claim
185 words
A magnetic transducer head utilizing magnetoresistance effect comprising; first and second sensing elements (2A 1 , 2A 2 ) arranged parallel and receiving a common signal magnetic field, each of said first and second sensing elements being composed of first and second soft magnetic layers (4,5) superposed having a nonmagnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having magnetroresistance effect and said first and second soft magnetic layers (4,5) being magnetostatically coupled through said non magnetic layer(3), a pair of electrodes (9B,9F) being connected to each of said first and second sensing elements at first and second end portions of each of said sensing elements and series connecting said first and second sensing element to flow a sense current through said first and second sensing elements along one direction, said sensing elements receiving said signal magnetic field parallel to said one direction, and said soft magnetic layers having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristics in a major surface of said soft magnetic layer.
Claim 4
Dependent Claim
185 words
A magnetic transducer head utilizing magnetoresistance effect comprising; first and second sensing elements (2A 1 , 2A 2 ) arranged parallel and receiving a common signal magnetic field, each of said first and second sensing elements being composed of first and second soft magnetic layers (4,5) superposed having a nonmagnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having magnetroresistance effect and said first and second soft magnetic layers (4,5) being magnetostatically coupled through said non magnetic layer(3), a pair of electrodes (9B,9F) being connected to each of said first and second sensing elements at first and second end portions of each of said sensing elements and series connecting said first and second sensing element to flow a sense current through said first and second sensing elements along one direction, said sensing elements receiving said signal magnetic field parallel to said one direction, and said soft magnetic layers having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristics in a major surface of said soft magnetic layer.
Claim 5
Dependent Claim
159 words
A magnetic transducer head utilizing magnetoresistance effect comprising; a plurality sensingelements (2A 1 , 2A 2 ,...2An) arranged parallel and receiving a common signal magnetic field, each of said sensing elements being composed of first and second soft magnetic layers(4,5) superposed having a nonmagnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having magnetoresistance effect and said first and second soft magnetic layers being magnetostatically coupled through said non magnetic layer, electrodes (9B 1 , 9B 2 ) being connected to said sensing elements for series connecting said plurality of sensing elements to flow a sense current through said sensing elements along one direction, said sensing elements receiving said signal magnetic field parallel to said one direction, and said soft magnetic layers having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristics in a major surface of said soft magnetic layer.
Claim 6
Dependent Claim
159 words
A magnetic transducer head utilizing magnetoresistance effect comprising; a plurality sensingelements (2A 1 , 2A 2 ,...2An) arranged parallel and receiving a common signal magnetic field, each of said sensing elements being composed of first and second soft magnetic layers(4,5) superposed having a nonmagnetic layer (3) between said first and second soft magnetic layers, at least one of said soft magnetic layers having magnetoresistance effect and said first and second soft magnetic layers being magnetostatically coupled through said non magnetic layer, electrodes (9B 1 , 9B 2 ) being connected to said sensing elements for series connecting said plurality of sensing elements to flow a sense current through said sensing elements along one direction, said sensing elements receiving said signal magnetic field parallel to said one direction, and said soft magnetic layers having an easy axis of magnetization substantially perpendicular to said one direction or having an isotropic magnetic characteristics in a major surface of said soft magnetic layer.
Claim 7
Dependent Claim
26 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, 2 or 3, wherein said nonmagnetic layer (3) has a thickness between 5 and 10,000h.
Claim 8
Dependent Claim
31 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, 2 or 3, wherein each of said electrodes (9B,9F) is connected to said first and second soft magnetic layers respectively.
Claim 9
Dependent Claim
32 words
A magnetic transducer head utilizing magnetoresistance effet according to claim 1, 2 or 3, wherein said first and second soft magnetic layers (4,5) are electrically connected together through said nonmagnetic layer (3).
Claim 10
Dependent Claim
33 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, 2 or 3, wherein said first soft magnetic layer has magnetoresistance effect and said second soft magnetic layer has little magnetoresistance effect.
Claim 11
Dependent Claim
59 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, 2 or 3, wherein said first soft magnetic layer has magnetoresistance effect, said second soft magnetic layer has little magnetoresistance effect, said first and second soft magnetic layers are electrically insulated by said nonmagnetic layer, and said pair of electrodes are connected to said first soft magnetic layer.
Claim 12
Dependent Claim
37 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, 2 or 3, further comprising means (t 1 , t 2 ) for applying a bias magnetic field to said sensing element along said one direction.
Claim 13
Dependent Claim
39 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 9, wherein said means for applying a bias magnetic field is a conductor provided adjacent to said sensing element to flow a bias current transducer to said one direction.
Claim 14
Dependent Claim
31 words
A magnetic transducer head utilizing ma g netoresistance effect according to claim 1, wherein said sensing element is arranged to face at one end thereof to a travelling magnetic recording medium.
Claim 15
Dependent Claim
59 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 1, further comprising a magnetic substrate, a first magnetic yoke making a gap with said magnetic substrate at one end of said first magnetic yoke, a second magnetic yoke magnetically connected to said magnetic substrate and said sensing element is provided to magnetically connect said first and second yokes.
Claim 16
Dependent Claim
31 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 2 or 3, wherein said sensing elements are arranged to face at one ends thereof to a travelling magnetic recording medium.
Claim 17
Dependent Claim
66 words
A magnetic transducer head utilizing magnetoresistance effect according to claim 2 or 3, further comprising a magnetic substrate (1), a first magnetic yoke (8F) making a gap (g) with said magnetic substrate at one end of said first magnetic yoke, a second magnetic yoke (8B) magnetically connected to said magnetic substrate (1) and said sensing element is provided to magnetically connect said first and second yokes.
References Cited (Backward Citations)
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