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EP0594243A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Magnetic field sensor

Assignee: Koninklijke Philips NV
•
Filing: 1993-10-13
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Granted: —
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Expires: 2013-10-13
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Abstract

Abstract The invention relates to a magnetic field sensor having a magnetoresistance element, comprising a substrate on which two ferromagnetic layers are provided which exhibit a uniaxial in-plane anisotropy and which are separated by a non-magnetic intermediate layer. In accordance with the invention, the anisotropy direction of one ferromagnetic layer extends transversely with respect to the anisotropy direction of the other ferromagnetic layer. By virtue thereof, it is attained that the change of the direction of magnetization in the sensor caused by external magnetic fields is much more uniform and that the corresponding magnetization curve exhibits a smaller hysteresis. When the sensor is used in a magnetic head, an improved signal/noise ratio is obtained.

Inventors

  • 👤 Wiepke Folkerts
  • 👤 Reinder Coehoorn
  • 👤 Adrianus Michael Johannes Martinus Fonken

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 23:10
CPC Classifications
B; B82; B82Y; B82Y25/00; G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G01R33/093; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H01F10/3268; H01F10/3281; H10; H10N; H10N50/00; H10N50/10

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 59 words
A magnetic field sensor having a magnetoresistance element, comprising a substrate to which two ferromagnetic layers are applied which exhibit a uniaxial in-plane anisotropy and which are separated by a non-magnetic intermediate layer, characterized in that the anisotropy direction of one of the ferromagnetic layers is oriented transversely with respect to the anisotropy direction of the other ferromagnetic layer.
Claim 2
Dependent Claim 59 words
A magnetic field sensor having a magnetoresistance element, comprising a substrate to which two ferromagnetic layers are applied which exhibit a uniaxial in-plane anisotropy and which are separated by a non-magnetic intermediate layer, characterized in that the anisotropy direction of one of the ferromagnetic layers is oriented transversely with respect to the anisotropy direction of the other ferromagnetic layer.
Claim 3
Dependent Claim 34 words
A magnetic field sensor as claimed in Claim 1, characterized in that one ferromagnetic layer consists of NiFe and the other ferromagnetic layer consists of NiFe which is magnetically coupled to an anti-ferromagnetic layer.
Claim 4
Dependent Claim 18 words
A magnetic field sensor as claimed in Claim 2, characterized in that the anti-ferromagnetic layer consists of FeMn.
Claim 5
Dependent Claim 25 words
A magnetic field sensor as claimed in Claim 1, 2 or 3, characterized in that the intermediate layer consists of Cu or a Cu alloy.
Claim 6
Dependent Claim 42 words
A magnetic field sensor as claimed in any one of the preceding Claims, characterized in that the thickness of the ferromagnetic layers is 2.5-10 nm, preferably 4-9 nm, and that the thickness of the intermediate layer is 1.5-5 nm, preferably 2-3 nm.
Claim 7
Dependent Claim 17 words
A magnetic head comprising a magnetic field sensor as claimed in any one of the preceding Claims.

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