EP0485129A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magnetoresistive device and method of making
Assignee: Toshiba Corp
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Filing: 1991-11-01
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Granted: —
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Expires: 2011-11-01
Abstract
Abstract Disclosed is an artificial multilayer in which ferromagnetic layers (102) and nonmagnetic layers (103) are alternatively laminated, wherein a uniaxial magnetic anisotropy is introduced into the ferromagnetic layers (102) 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 (102) by applying a magnetic field along the surface of ferromagnetic layers (102) during the formation thereof.
Inventors
- 👤 Shiho C/O Intellectual Property Div. Okuno
- 👤 Susumu C/O Intellectual Property Div. Hashimoto
- 👤 Keiichiro C/O Intellectual Property Div. Yusu
- 👤 Koichiro C/O Intellectual Property Div. Inomata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:34
CPC Classifications
B; B82; B82Y; B82Y25/00; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H01F10/3268; H01F10/3281; B82Y40/00; H01F41/00; H01F41/14; H01F41/30; H01F41/302; H10; H10N; H10N50/00; H10N50/80; H10N50/85; G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/11; Y10T428/1107; Y10T428/1121; Y10T428/1129; Y10T428/12; Y10T428/12493; Y10T428/12632; Y10T428/12771; Y10T428/12806; Y10T428/12819; Y10T428/12826; Y10T428/12847; Y10T428/12854; Y10T428/12861; Y10T428/12889; Y10T428/12903; Y10T428/12944; Y10T428/12951; Y10T428/24; Y10T428/24942; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
36 words
An artificial multilayer comprising ferromagnetic layers and nonmagnetic layers which are laminated, characterized in that a uniaxial magnetic anisotropy is introduced into said ferromagnetic layers in a predetermined direction along the surface of the said multilayer.
Claim 2
Dependent Claim
36 words
An artificial multilayer comprising ferromagnetic layers and nonmagnetic layers which are alternatively laminated, characterized in that a uniaxial magnetic anisotropy is introduced into said ferromagnetic layers in a predetermined direction along the surface of said multilayer.
Claim 3
Dependent Claim
32 words
The artificial multilayer according to claim 1, characterized in that said uniaxial magnetic anisotropy is introduced by applying a magnetic field along the surface of said ferromagnetic layers during the formation thereof.
Claim 4
Dependent Claim
37 words
The artificial multilayer according to claim 1, characterized in that said uniaxial magnetic anisotropy is introduced by applying a magnetic field along the surface of said ferromagnetic layers while heat treating after the formation of said multilayer.
Claim 5
Dependent Claim
22 words
The artificial multilayer according to claim 1, characterized in that said uniaxial magnetic anisotropy is introduced by crystalline symmetry of said multilayer.
Claim 6
Dependent Claim
56 words
The artificial multilayer according to claim 1, characterized in that said ferromagnetic layers consist of at least one selected from a group consisting of Fe, Co, Ni, and their alloys and compounds, and said nonmagnetic layers consist of at least one selected from a group consisting of V, Cr, Cu, Au, and their alloys and compounds.
Claim 7
Dependent Claim
19 words
The artificial multilayer according to claim 1, characterized in that said ferromagnetic layers consist of one type of material.
Claim 8
Dependent Claim
19 words
The artificial multilayer according to claim 1, characterized in that said ferromagnetic layers consist of two types of materials.
Claim 9
Dependent Claim
37 words
The artificial multilayer according to claim 8, characterized in that said ferromagnetic layers consist of two types of materials of a hard layer having a large magnetic anisotropy and a soft layer having a small magnetic anisotropy.
Claim 10
Dependent Claim
45 words
The artificial multilayer according to claim 1, characterized in that the thickness of said ferromagnetic layers ranges 0.5 to 20 nm, the thickness of said nonmagnetic layers ranges 0.5 to 20 nm, and the entire thickness of the laminated layers ranges 30 to 500 nm.
Claim 11
Dependent Claim
32 words
The artificial multilayer according to claim 1, characterized in that uniaxial magnetic anisotropies of which directions are different to each other are introduced to adjacent two ferromagnetic layers through a nonmagnetic layer.
Claim 12
Dependent Claim
36 words
The artificial multilayer according to claim 11, characterized in that an angle formed between the directions of uniaxial magnetic anisotropies to be introduced to adjacent two ferromagnetic layers through the nonmagnetic layer is 30 to 90°.
Claim 13
Dependent Claim
23 words
The artificial multilayer according to claim 1, characterized in that said ferromagnetic layers and nonmagnetic layers are alternatively laminated on a non-singlecrystalline substrate.
Claim 14
Dependent Claim
17 words
The artificial multilayer according to claim 13, characterized in that said non-singlecrystalline substrate is a glass substrate.
Claim 15
Independent Claim
46 words
A method of manufacturing an artificial multilayer comprising ferromagnetic layers and non-magnetic layers alternatively laminated characterized by comprising: a step of introducing a uniaxial magnetic anisotropy into said ferromagnetic layers in a predetermined direction by applying a magnetic field along the surface of said ferromagnetic layers.
Claim 16
Dependent Claim
25 words
The method according to claim 15, characterized in that a magnetic field is applied along the surface of said ferromagnetic layers during the formation thereof.
Claim 17
Dependent Claim
30 words
The method according to claim 15, characterized in that a magnetic field is applied along the surface of said ferromagnetic layer while heat treating after the formation of said multilayer.
Claim 18
Dependent Claim
55 words
The method according to claim 15, characterized in that said ferromagnetic layers consist of at least one selected from a group consisting of Fe, Co, Ni, and their alloys and compounds, and said nonmagnetic layers consist of at least one selected from a group consisting of V, Cr, Cu, Au, and their alloys and compounds.
Claim 19
Dependent Claim
18 words
The method according to claim 15, characterized in that said ferromagnetic layers consist of one type of material.
Claim 20
Dependent Claim
18 words
The method according to claim 15, characterized in that said ferromagnetic layers consist of two types of materials.
Claim 21
Dependent Claim
36 words
The method according to claim 20, characterized in that said ferromagnetic layers consist of two types of materials of a hard layer having a large magnetic anisotropy and a soft layer having a small magnetic anisotropy.
Claim 22
Dependent Claim
44 words
The method according to claim 15, characterized in that the thickness of said ferromagnetic layers ranges 0.5 to 20 nm, the thickness of said nonmagnetic layers ranges 0.5 to 20 nm, and the entire thickness of the laminated layers ranges 30 to 500 nm.
Claim 23
Dependent Claim
31 words
The method according to claim 15, characterized in that uniaxial magnetic anisotropies of which directions are different to each other are introduced to adjacent two ferromagnetic layers through a nonmagnetic layer.
Claim 24
Dependent Claim
35 words
The method according to claim 23, characterized in that an angle formed between the directions of uniaxial magnetic anisotropies to be introduced to adjacent two ferromagnetic layers through the nonmagnetic layer is 30 to 90°.
Claim 25
Dependent Claim
22 words
The method according to claim 15, characterized in that said ferromagnetic layers and nonmagnetic layers are alternatively laminated on a non-singlecrystalline substrate.
Claim 26
Dependent Claim
16 words
The method according to claim 25, characterized in that said non-singlecrystalline substrate is a glass substrate.
References Cited (Backward Citations)
FR2452168A3
Cited
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