Artificial multilayer and method of manufacturing the same
First Claim
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1. A magnetoresistance device comprising:
- ferromagnetic and non-magnetic layers which are laminated to form a multilayer structure, wherein said ferromagnetic layers have a uniaxial magnetic anisotropy along the surface of the said multilayer structure which is introduced by a magnetic field, each of said ferromagnetic layers having a thickness between 0.5 and 20 nm;
a substrate having a non-singlecrystalline surface, wherein said ferromagnetic and non-magnetic layers are laminated upon said substrate; and
means, coupled to said multilayer structure, for measuring resistivity of the multilayer structure along a direction that is parallel to the layers of the multilayer structure.
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Abstract
Disclosed is an artificial multilayer in which ferromagnetic layers and nonmagnetic layers are alternatively laminated, wherein a uniaxial magnetic anisotropy is introduced into the ferromagnetic layers in a predetermined direction, thereby controlling the gradient of the relative change of resistivity to the change of external magnetic field. The uniaxial magnetic anisotropy is introduced into the ferromagnetic layers by applying a magnetic field along the surface of ferromagnetic layers during the formation thereof.
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Citations
52 Claims
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1. A magnetoresistance device comprising:
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ferromagnetic and non-magnetic layers which are laminated to form a multilayer structure, wherein said ferromagnetic layers have a uniaxial magnetic anisotropy along the surface of the said multilayer structure which is introduced by a magnetic field, each of said ferromagnetic layers having a thickness between 0.5 and 20 nm; a substrate having a non-singlecrystalline surface, wherein said ferromagnetic and non-magnetic layers are laminated upon said substrate; and means, coupled to said multilayer structure, for measuring resistivity of the multilayer structure along a direction that is parallel to the layers of the multilayer structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetoresistance device comprising:
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ferromagnetic and non-magnetic layers which are alternately laminated to form a multilayer structure, wherein said ferromagnetic layers have a uniaxial magnetic anisotropy along the surface of said multilayer structure which is introduced by a magnetic field, each of said ferromagnetic layers having a thickness between 0.5 and 20 nm; a substrate having a non-singlecrystalline wherein said ferromagnetic and non-magnetic layers are laminated upon said substrate; and means, coupled to said multilayer structure, for measuring resistivity of said multilayer structure along a direction that is parallel to the layers of the multilayer structure. - View Dependent Claims (14, 15, 16, 18)
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17. A magnetoresistance device, comprising:
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a multilayer structure having a major surface, said multilayer structure formed from a lamination of ferromagnetic and non-magnetic layers upon a substrate having a non-singlecrystalline surface, wherein said ferromagnetic layers have uniaxial magnetic anisotropy in a direction that is parallel to the major surface of the multilayer structure Which is introduced by a magnetic field; and means, coupled to said multilayer structure, for measuring resistivity of the multilayer structure. - View Dependent Claims (19)
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20. A magnetoresistance device, comprising:
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a multilayer structure having a major surface, said multilayer structure formed from ferromagnetic and nonmagnetic layers that are alternately laminated upon a substrate having a non-singlecrystalline surface, wherein said ferromagnetic layers have a uniaxial magnetic anisotropy that is parallel to the major surface of the multilayer structure which is introduced by a magnetic field; and means, coupled to said multilayer structure, for measuring resistivity of the multilayer structure. - View Dependent Claims (21, 22)
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23. A magnetoresistance device for measuring a change in resistivity due to the presence of a magnetic field where the device is located, comprising:
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a substrate having a non-singlecrystalline surface; a multilayer structure formed from a lamination of ferromagnetic and non-magnetic layers upon said substrate, said lamination having a major surface; and
whereinsaid ferromagnetic layers have a uniaxial magnetic anisotropy that is parallel to the major surface of the lamination which is introduced by a magnetic field. - View Dependent Claims (24, 25, 26)
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27. A magnetoresistance device for measuring a change in resistivity due to the presence of a magnetic field where the device is located, comprising:
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a substrate having a non-singlecrystalline surface; a multilayer structure formed from ferromagnetic and non-magnetic layers which are alternately laminated upon said substrate to form a lamination that has a major surface; and
whereinsaid ferromagnetic layers have a uniaxial magnetic anisotropy that is parallel to the major surface of the lamination which is introduced by a magnetic field. - View Dependent Claims (28, 29)
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30. A method of manufacturing a magnetoresistance device comprising ferromagnetic and non-magnetic layers on a substrate, having a non-singlecrystalline surface said ferromagnetic and non-magnetic layers being alternately laminated one upon the other, said method comprising the steps of:
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depositing said ferromagnetic layers and non-magnetic layers upon said substrate, each of said ferromagnetic layers having a thickness between 0.5 and 20 nm; and introducing a uniaxial magnetic anisotropy into said ferromagnetic layers by applying a magnetic filed along the surface of said ferromagnetic layers. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A method of manufacturing a magnetoresistance device comprising ferromagnetic and non-magnetic layers, said ferromagnetic and non-magnetic layers being alternately laminated one upon the other to form a lamination having a major surface, said method comprising the steps of:
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depositing said ferromagnetic and non-magnetic layers on a substrate having a non-singlecrystalline surface; introducing uniaxial magnetic anisotropy into said ferromagnetic layers by applying a magnetic field that is parallel to the major surface of the lamination; and connecting a means for measuring resistivity to at least one of the non-magnetic layers. - View Dependent Claims (45, 46)
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47. A method of measuring a magnetic field with a magnetoresistance device, comprising the steps of:
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forming a magnetoresistance device comprising a multilayer structure comprising a substrate having a non-single crystalline surface and a lamination of ferromagnetic and non-magnetic layers on said substrate, said lamination having a major surface, and said ferromagnetic layers having uniaxial magnetic anisotropy introduced by deposition in a magnetic field or annealing in a magnetic field along said major surface; disposing the multilayer structure in a first magnetic field; and measuring a resistivity of the multilayer structure while the multilayer structure is in the first magnetic field. - View Dependent Claims (48, 49, 50, 51, 52)
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Specification