Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1994-04-15
1996-08-27
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694R, 428694T, 428702, 428800, 428928, 360113, 338 32R, 2041922, 20419221, 252 6251R, 324252, 427127, 427128, 427129, 427130, G11B 566, B05D 512, C23C 1400
Patent
active
055499775
ABSTRACT:
A magnetoresistance ratio of 200% (absolute value) or more at room temperature in a field of 6T can be achieved in a layer of material of nominal composition XMnO.sub.y (X is La and at least one of Ca, Sr and Ba, y in the range 2-3.5), if, after formation of the layer, the layer is heat treated in an oxygen-rich (O.sub.2 partial pressure greater than that of air) atmosphere, typically in flowing O.sub.2. The temperature and duration of the heat treatment are in the range 300.degree.-850.degree.C. and 10 minutes-12 hours, and are selected to result in the desired ratio of 200% or more.
REFERENCES:
patent: 4622613 (1980-11-01), Nomura
patent: 5287238 (1984-02-01), Baumgart
patent: 5304975 (1984-04-01), Saito
patent: 5341118 (1994-08-01), Parkin
von Helmolt, R., et al., "Giant Negative Magnetoresistance in Perovskitelike La.sub. 2/3 Ba.sub. 1/3 MnO.sub.x Ferromagnetic Films", Phys. Rev. Lett. vol. 71, No. 14, pp. 2331-2333, 4 Oct. 1993.
Chahara, K. et al., "Magnetoresistance in magnetic manganese oxide with intrinsic antiferromagnetic spin structure", Appl. Phys. Lett. vol. 63, No. 14, pp. 1990-1992, 4 Oct. 1993.
Levy, Peter M., "Giant Magnetoresistance in Magnetic Layered and Granular Materials", Science, vol. 256, pp. 972-973, 15 May 1992.
Fullerton, E., et al., "150% magnetoresistance in sputtered Fe/Cr(100) superlattices", Appl. Phys. Lett. vol. 63, No. 12, pp. 1699-1701, 20 Sep. 1993.
Gallagher, P. K., "Oxygen Stoichiometry in Ba.sub.2 YCu.sub.3 O.sub.x ", Mat. Res. Bull. vol. 22, pp. 995-1006, 1987.
Jin Sung-ho
McCormack Mark T.
Ramesh Ramamoorthy
Kiliman Leszek
Lucent Technologies - Inc.
Pacher Eugen E.
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