Paper Title:
Enhanced Room Temperature Magnetoresistance in La0.7Ca0.2Sr0.1MnO3/BN Composites
  Abstract

The effect of added BN on the electro-magnetic properties and enhanced room temperature magnetoresistance in (1-x)La0.7Ca0.2Sr0.1MnO3 (LCSMO)+x(BN) composites has been studied systematically. The results of X-ray diffraction (XRD) and SEM show that BN and LCSMO coexist in the composites and BN mainly goes into the grain boundary region without any chemical reaction with LCSMO. The results of electronic measurements show that the intrinsic insulator-metal transition temperature (TP) does not change, which is in accordance with the results for the Curie temperature TC. It is interesting to note that an enhanced magnetoresisitance (MR) effect for the composites is found over a wide temperature range from low temperature to room temperature in an applied magnetic field of 3 kOe. These phenomena can be explained by considering that BN, which segregated at the grain boundaries or surfaces, does not change the intrinsic structure of LCSMO. We argue that the introduction of BN gives rise to magnetic disorder and hence an enhanced tunnelling effect, which is responsible for the MR enhancement.

  Info
Periodical
Advanced Materials Research (Volumes 284-286)
Chapter
Composites
Edited by
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
Pages
120-125
DOI
10.4028/www.scientific.net/AMR.284-286.120
Citation
A. Y. Zuo, Y. D. Zhu, H. H. Liao, J. J. Tan, "Enhanced Room Temperature Magnetoresistance in La0.7Ca0.2Sr0.1MnO3/BN Composites", Advanced Materials Research, Vols. 284-286, pp. 120-125, 2011
Online since
July 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Kazuki Takahashi, Kanji Yasui, Maki Suemitsu, Ariyuki Kato, Yuichiro Kuroki, Masasuke Takata, Tadashi Akahane
Abstract:Gallium nitride (GaN) films were grown on SiC/Si(111) substrates by hot-mesh chemical vapor deposition (CVD) using trimethylgallium (TMG)...
261
Authors: Sanjeev K. Gupta, Mina Talati, Prafulla K. Jha
Abstract:The present paper reports a simple calculation of the size and shape dependent melting temperature of nanoparticles. The melting temperature...
132
Authors: Rui Zhang, Hai Long Wang, Hong Liang Xu, Hong Xia Lu, Dao Yuan Yang
Abstract:SiC-based boundary layer capacitors were prepared by hot pressing. XRD, TEM and the high-resolution TEM techniques were used to characterize...
235
Authors: L.G. Antoshina, A.B. Korshak
Abstract:The investigation of magnetic properties of diluted ferrite NiGa0.8Al0.8Fe0.4O4 is carried out. Anomalous behaviour of spontaneous...
97
Authors: Yong Xue, Zhi Min Zhang, Li Hui Lang, Li Li
Abstract:In the present paper a research has been made on the effect of aging on the microstructure and mechanical properties of AZ80 and ZK60 wrought...
560