Colossal magnetoresistance in La-Y-Ca-Mn-O films

Author

Chen, L.H. ; Tiefel, T. T H ; Jin, S. ; Palstra, T.T.M. ; Ramesh, R. ; Kwon, C.

Author_Institution

Kaohsiung Polytech. Inst., Taiwan

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4692

Lastpage

4694

Abstract

Magnetoresistance behavior of La_0.60Y_0.07CaMnO_x thin films epitaxially grown on LaAlO₃ has been investigated. The films exhibit colossal magnetoresistance with the MR ratio in excess of 10⁸% at -60 K, H=7T, which is the highest ever reported for thin film manganites. The partial substitution of La³⁺ ions with much smaller Y³⁺ ions results in mote than an order of magnitude improvement in MR as compared to the undoped La-Ca-Mn-O material, both in bulk and thin film form. The La-Y-Ca-Mn-O films exhibit a strong dependence of magneto-resistance on film thickness with the maximum MR occuring at a film thickness of -1000

Keywords

calcium compounds; epitaxial layers; giant magnetoresistance; lanthanum compounds; yttrium compounds; 60 K; La-Y-Ca-Mn-O films; La_0.60Y_0.07CaMnO; La_0.60Y_0.07CaMnO_x; LaAlO₃; colossal magnetoresistance; partial substitution; thin film manganites; Atmosphere; Colossal magnetoresistance; Conductivity; Lattices; Magnetic films; Magnetic materials; Substrates; Superconducting films; Superconducting magnets; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539120

Filename

539120