US5636093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic multilayer device having resonant-tunneling double-barrier structure
Assignee: US Philips Corp
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Filing: 1995-09-28
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Granted: 1997-06-03
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Expires: 2015-09-28
Abstract
Abstract A magnetic multilayer device (1) comprising two layers (3, 5) of magnetic material which are separated by an interposed layered structure comprising a resonant-tunneling double-barrier structure (RTDBS) (7). In such a device (1), exchange coupling between the magnetic layers (3, 5) can be modified by subjection of the RTDBS (7) to an electric field. In this way, the configuration of the magnetisations (M 1 , M 2 ) in the magnetic layers (3, 5), and thus the net magnetic flux generated by the device (1), can be electrically adjusted. The device (1) can be applied inter alia in a magnetic recording head.
Inventors
- 👤 Martinus A. M. Gijs
- 👤 Hendrik Van Houten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:58
CPC Classifications
B; B82; B82Y; B82Y25/00; G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/48; G11B5/49; G11B5/4907; G11C; G11C11/00; G11C11/02; G11C11/14; G11C11/15; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H01F10/3254; H10; H10N; H10N50/00; H10N50/10; G11C2211/00; G11C2211/56; G11C2211/561; G11C2211/5614
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A magnetic multilayer device comprising two adjustably exchange coupled layers of magnetic material which are separated by an interposed layered structure, characterised in that the interposed layered structure comprises a resonant-tunneling double-barrier structure (RTDBS) having an intermediate layer sandwiched between two barrier layers.
Claim 2
Dependent Claim
43 words
A magnetic multilayer device comprising two adjustably exchange coupled layers of magnetic material which are separated by an interposed layered structure, characterised in that the interposed layered structure comprises a resonant-tunneling double-barrier structure (RTDBS) having an intermediate layer sandwiched between two barrier layers.
Claim 3
Dependent Claim
33 words
A device according to claim 1, characterised in that the intermediate layer of the RTDBS comprises GaAs, and the barrier layers of the RTDBS each comprise Al 1-x Ga x As wherein x=0.4-0.8.
Claim 4
Dependent Claim
14 words
A device according to claim 2, characterised in that the magnetic material comprises MnGa.
Claim 5
Dependent Claim
40 words
A device according to claim 2, characterised in that the intermediate layer of the RTDBS has a thickness in the range 1-10 nm, and that the barrier layers of the RTDBS each have a thickness in the range 0.5-2.0 nm.
Claim 6
Dependent Claim
14 words
A device according to claim 1, characterised in that the magnetic material comprises MnGa.
Claim 7
Dependent Claim
40 words
A device according to claim 5, characterised in that the intermediate layer of the RTDBS has a thickness in the range 1-10 nm, and that the barrier layers of the RTDBS each have a thickness in the range 0.5-2.0 nm.
Claim 8
Dependent Claim
40 words
A device according to claim 1, characterised in that the intermediate layer of the RTDBS has a thickness in the range 1-10 nm, and that the barrier layers of the RTDBS each have a thickness in the range 0.5-2.0 nm.
Claim 9
Dependent Claim
11 words
A magnetic recording head comprising a device according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-02 | 2000-12-02 | 2001-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-02 | 2004-12-02 | 2005-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-02 | 2008-12-02 | 2009-06-03 | $7700.00 | Window Closed / Lapsed |