Microstructure, Magnetic, and Magnetoresistance Properties of La0.7Sr0.3MnO3:CuO Nanocomposite Thin Films

Meng Fan; Han Wang; Shikhar Misra; Bruce Zhang; Zhimin Qi; Xing Sun; Jijie Huang; Haiyan Wang

doi:10.1021/acsami.7b17398

Microstructure, Magnetic, and Magnetoresistance Properties of La_0.7Sr_0.3MnO₃:CuO Nanocomposite Thin Films

ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5779-5784. doi: 10.1021/acsami.7b17398. Epub 2018 Feb 2.

Authors

Meng Fan¹, Han Wang¹, Shikhar Misra¹, Bruce Zhang¹, Zhimin Qi¹, Xing Sun¹, Jijie Huang¹, Haiyan Wang¹

Affiliation

¹ School of Materials Engineering and ‡Department of Electrical and Computer Engineering, Purdue University , West Lafayette, Indiana 47907, United States.

PMID: 29361226
DOI: 10.1021/acsami.7b17398

Abstract

(La_0.7Sr_0.3MnO₃)_0.67:(CuO)_0.33 (LSMO:CuO) nanocomposite thin films were deposited on SrTiO₃ (001), LaAlO₃ (001), and MgO (001) substrates by pulsed laser deposition, and their microstructure as well as magnetic and magnetoresistance properties were investigated. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results show that LSMO:CuO films grow as highly textured self-assembled vertically aligned nanocomposite (VAN), with a systematic domain structure and strain tuning effect based on the substrate type and laser deposition frequency. A record high low-field magnetoresistance (LFMR) value of ∼80% has been achieved in LSMO:CuO grown on LaAlO₃ (001) substrate under high frequency. Detailed analysis indicates that both the strain state and the phase boundary effect play a significant role in governing the overall LFMR behavior.

Keywords: La0.7Sr0.3MnO3:CuO; epitaxy; low field magnetoresistance (LFMR); thin films; vertically aligned nanocomposite (VAN).