npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Physics: Sae Mulli 2017; 67: 679-683

Published online June 30, 2017 https://doi.org/10.3938/NPSM.67.679

Copyright © New Physics: Sae Mulli.

Study on the Structural and Electrical Properties of CaMnO$_3$/La$_{0.7}$Ca$_{0.3}$MnO$_3$/CaMnO$_3$ Heterostructures

Van-Hien NGUYEN, Tuan Khanh CHAU, Heon-Jung KIM*

Department of Physics, Daegu University, Gyeongsan 38453, Korea

Correspondence to:hjkim76@daegu.ac.kr

Received: November 30, 2016; Revised: February 2, 2017; Accepted: February 18, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, CaMnO$_3$/La$_{0.7}$Ca$_{0.3}$MnO$_3$/CaMnO$_3$ heterostructures were deposited on (100) SrTiO$_3$ substrates with the optimal conditions for single layers of CaMnO$_3$ and La$_{0.7}$Ca$_{0.3}$MnO$_3$ via the pulsed laser deposition (PLD) technique. We performed X-ray diffraction (XRD), atomic force microscopy (AFM), and resistivity measurements to investigate the crystallinity, morphology and electrical properties of these heterostructures. All heterostructures showed homogeneous and uniform morphologies with small RMS roughnesses. The heterostructures exhibited a metallic behavior when the thickness of the bottom CaMnO$_3$ (CMO) layer was small and the thickness of the La$_{0.7}$Ca$_{0.3}$MnO$_3$ (LCMO) layer was between 10 and 30 nm.

Keywords: Manganites, Heterostructures, Resistivity, Magnetism, PLD

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