Enhancement of electronic transport and magnetoresistance of -impregnated thin films

J. H. Markna; P. S. Vachhani; R. N. Parmar; D. G. Kuberkar; P. Misra; B. N. Singh; L. M. Kukreja; D. S. Rana; S. K. Malik

doi:10.1209/0295-5075/79/17005

All issues

Volume 79 / No 1 (July 2007)

EPL, 79 1 (2007) 17005

Abstract

Issue		EPL Volume 79, Number 1, July 2007


Article Number		17005
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/79/17005
Published online		15 June 2007

EPL, 79 (2007) 17005

Enhancement of electronic transport and magnetoresistance of $\chem{Al_{2}O_{3}}$ -impregnated $\chem{(La_{0.5}Pr_{0.2}) Sr_{0.3}MnO_{3}}$ thin films

J. H. Markna¹, P. S. Vachhani¹, R. N. Parmar¹, D. G. Kuberkar¹, P. Misra², B. N. Singh², L. M. Kukreja², D. S. Rana³ and S. K. Malik⁴

¹ Department of Physics, Saurashtra University - Rajkot 360005, India
² Thin Film Laboratory, Raja Ramanna Center for Advance Technology - Indore 452 013, India
³ Institute of Laser Engineering, Osaka University - Osaka 565 0871, Japan
⁴ International Center for Condensed Matter Physics (ICCMP) University of Brasilia - Brasilia, Brazil

Corresponding author: jaysukh28@rediffmail.com

Received: 11 April 2007
Accepted: 22 May 2007

Abstract

We have used a non-magnetic ${\rm Al}_{2}{\rm O}_{3}$ barrier, impregnated in $({\rm La}_{0.5}{\rm Pr}_{0.2}){\rm Sr}_{0.3}{\rm MnO}_{3}$ (LPSMO) thin film layers, to obtain large magnetoresistance (MR) in the vicinity of room temperature. In the magnetic field of 1T, the LPSMO/ ${\rm Al}_{2}{\rm O}_{3}$ /LPSMO heterostructure exhibits an MR of $\sim 35{\%}$ at its insulator-to-metal transition temperature ( $T_{{\rm IM}}$ ) of $\sim 220\,{\rm K}$ vis-à-vis an MR of $\sim 8{\%}$ in the pristine LPSMO film at its $T_{{\rm IM}}$ of 298 K. This enhanced MR, coupled with a 2- to 3-fold increase in the temperature coefficient of resistance and the field coefficient of resistance in the heterostructure compared to that in the LPSMO films, demonstrates the efficiency of this technique in engineering those physical properties of manganites which have potential bearing on the realization of their technological applications.

PACS: 72.25.Mk – Spin transport through interfaces

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