Magnetic behaviors and enhanced magnetoresistance in granular (La 0.7Pb0.3MnO3)1-x(Fe 2O3)x composites

S. L. Young, Lance Horng, Y. W. Ho, K. M. Wu, Yu-Tai Shih, H. Z. Chen, M. C. Kao, J. B. Shi, C. C. Lin

Research output: Contribution to journalConference article

Abstract

Recently, researches indicate that grain boundaries and interfaces can be the major factors of magnetoresistance effects, which has attracted renewed interests on the colossal magnetoresistance materials. In this article, the magnetic behaviours and magnetotransport properties of (La0.7Pb 0.3MnO3)1-x(Fe2O3) x composites have been investigated. Ferromagnetism is gradually suppressed as the weight percentage of Fe2O3 is increased. Saturation magnetization (MS) decreases from 78.7 emu/g for x = 0.0 to 60.6 emu/g for x = 0.2, while ferromagnetic transition temperature (T C) remains around 346K for all composites. The resistivity increases significantly as the x value increases in these composites. It is suggested that the introduction of Fe2O3 into the composites acts as a separation layer between La0.7Pb0.3MnO3 grains. The enhancement of magnetoresistance has been verified with the addition of Fe2O3 into the composites.

Original languageEnglish
Pages (from-to)4556-4559
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume4
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1
EventInternational Symposium on Advanced Magnetic Materials and Appilications, (ISAMMA 2007) - Jeju, Korea, Republic of
Duration: 2007 May 282007 Jun 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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