Large magnetoresistance in La-Ca-Mn-O films

Author

Chen, L.H. ; Jin, S. ; Tiefel, T.H. ; Ramesh, R. ; Schurig, D.

Author_Institution

Kaohsiung Polytech. Inst., Ta-Hsu Hsiang, Taiwan

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3912

Lastpage

3914

Abstract

A very large magnetoresistance value in excess of 10⁶% has been obtained at 110 K, H=6T in La-Ca-Mn-O thin films epitaxially grown on LaAlO₃ substrates by pulsed laser deposition. The as-deposited film exhibits a substantial magnetoresistance value of 39,000%, which is further improved by heat treatment. A strong dependence of the magnetoresistance on film thickness was observed, with the value reduced by orders of magnitude when the film is made thicker than ~2000 Å. This behavior is interpreted in terms of lattice strain in the La-Ca-Mn-O films

Keywords

calcium compounds; ferromagnetic materials; giant magnetoresistance; heat treatment; internal stresses; lanthanum compounds; magnetic epitaxial layers; magnetoresistance; pulsed laser deposition; vapour phase epitaxial growth; 110 K; 2000 A; 6 T; La-Ca-Mn-O; La-Ca-Mn-O films; LaAlO₃; LaAlO₃ substrates; as-deposited film; epitaxial film; ferromagnetic film; film thickness dependence; heat treatment; large magnetoresistance; lattice strain; pulsed laser deposition; thin films; Atmosphere; Conductivity; Electric resistance; Heat treatment; Magnetic materials; Magnetoresistance; Optical pulses; Pulsed laser deposition; Sputtering; Substrates;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489814

Filename

489814