Epitaxial thin films of magnetic perovskites — preparation, properties and possible applications

Epitaxial thin films of magnetic perovskites — preparation, properties and possible applications

Doped La-manganites belong to the class of perovskite materials showing the so-called colossal magnetoresistance effect (CMR) near their Curie temperature T c, which can be varied in a wide range up to 380 K. The magnetoresistance (MR) ratio of sputtered epitaxial films changes strongly with their T...

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Bibliographic Details
Published in:Vacuum Vol. 58; no. 2; pp. 135 - 148
Main Authors: Steinbeiß, E, Steenbeck, K, Eick, T, Kirsch, K
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-08-2000
Subjects:
Epitaxial films
Magnetic perovskites
Magnetoresistance
Magnetoresistance
Epitaxial films
Magnetic perovskites
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Summary:Doped La-manganites belong to the class of perovskite materials showing the so-called colossal magnetoresistance effect (CMR) near their Curie temperature T c, which can be varied in a wide range up to 380 K. The magnetoresistance (MR) ratio of sputtered epitaxial films changes strongly with their T c from 8000% at 90 K to 35% at 310 K in a field of 1 T. Bicrystalline and polycrystalline films show an additional MR effect below T c. Whereas the CMR effect is caused by a magnetic phase transition the low-temperature MR effects are induced by the transport of spin-polarized carriers across grain boundaries acting as tunneling barriers. The CMR effect is interesting for applications especially in position sensors because of its large dynamic range without hysteresis and saturation effects.
ISSN:0042-207X
1879-2715
DOI:10.1016/S0042-207X(00)00162-7