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Anomalous Magnetoresistance Effect in Strained Manganite Ultrathin Films

Published online by Cambridge University Press:  10 February 2011

Qi Li ,
H. S. Wang ,
Y. F. Hu  and
E. Wertz
Qi Li
Affiliation:
Department of Physics, Pennsylvania State University, University Park, PA 16802
H. S. Wang
Affiliation:
Department of Physics, Pennsylvania State University, University Park, PA 16802
Y. F. Hu
Affiliation:
Department of Physics, Pennsylvania State University, University Park, PA 16802
E. Wertz
Affiliation:
Department of Physics, Pennsylvania State University, University Park, PA 16802
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Abstract

Magnetotransport properties of strained epitaxial Pr2/3Sr1/3MnOz (PSMO) ultrathin films have been studied. The strains are controlled by growing PSMO films on different lattice-mismatched substrates which impose biaxial compressive-, tensile-, and very little strain in the films, respectively. Distinctive magnetoresistance effects in low magnetic field (LFMR) have been observed in films with different types of strain. The films with compressive strain show very large negative LFMR (> 1000 % at 2500 Oe) and significant magnetoresistance hysteresis when a magnetic field is applied perpendicular to the film plane. In a parallel field, the LFMR is much smaller with almost no hysteresis. In contrast, the tensile-strained ultrathin films show positive LFMR at low temperatures in a perpendicular field and a negative LFMR in a parallel field. In comparison, the almost strain-free ultrathin films show very small LFMR (< 2 %) as in single crystal samples at similar temperatures and magnetic fields. In the compressive-strained samples, the large LFMR decreases rapidly with increasing film thickness. These results are interpreted based on spin dependent scattering at the domain walls and domain-rotation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 185
Copyright
Copyright © Materials Research Society 2000

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