Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1994-09-29
1996-07-23
Robinson, Ellis P.
Stock material or miscellaneous articles
Composite
Of inorganic material
428694R, 428702, 428900, 324252, 338 32R, B32B 900
Patent
active
055388000
ABSTRACT:
Materials of composition La.sub.v X.sub.w M.sub.y Mn.sub.z O.sub.x, with x selected from Mg, Sc, Al, Zn, Cd, In and the rare earths that have an ionic radius smaller than that of La, with M selected from Ca, Sr, Ba and Pb, and with v, w, y, z and x in the ranges 0.45-0.85, 0.01-0.20, 0.20-0.45, 0.7-1.3 and 2.5-3.5, respectively, can have substantially improved magnetoresistance (MR) ratios, as compared to the corresponding X-free comparison material. In particular, the novel materials in polycrystalline (or non-epitaxial thin film) form can have relatively large MR ratios. For instance, polycrystalline La.sub.0.60 Y.sub.0.07 Ca.sub.0.33 MnO.sub.x had a peak MR ratio in excess of 10,000% (in absolute value) in a field of 6 T.
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F. S. Gallaso, "Structure and Properties of Inorganic Solids", Pergamon Press, New York, 1970, pp. 8-11.
"Solid State Magnetic Field Sensors and Applications", by J. Heremans, J. Physics, D: Applied Physics, vol. 26, pp. 1149-1168, 1993.
"The Magnetoresistive Sensor-A Sensitive Device For Detecting Magnetic Field Variations", by U. Dibbern, et al., Electronic Components and Applications, vol. 5, No. 3, Jun. 1983, pp. 148-153.
Jin Sung-ho
McCormack Mark T.
O'Bryan, Jr. Henry M.
Rhodes Warren W.
Tiefel Thomas H.
AT&T Corp.
Pacher Eugen E.
Robinson Ellis P.
Speer Timothy M.
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