Finite-size effects in nanoscaled multiferroics

J. J. Heremans, J. Zhong, R. Varghese, G. T. Yee, S. Priya

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We present studies of single-phase multiferroic materials in nanoparticle or nanoplate form, where size effects modify the long range magnetic structure and hence influence the magnetic properties. Size effects as isolated here, are of particular relevance to understand the interplay between magnetic and ferroelectric properties in heterogeneous, multi-phase multiferroic structures. Bulk multiferroic BiMnO3 shows ferromagnetic ordering below 105 K, but few characterization attempts have been performed on nanoscaled material. We have synthesized BiMnO3 nanoplates and characterized the structure, composition, morphology and magnetic properties. Ferromagnetic behavior is not observed in the nanoplates, in contrast to the bulk, indicative of finite size effects. We have also synthesized BiFeO3 nanoparticles (characterized by XRD, EDS and magnetometry), which exhibit ferromagnetism with spin-glass-like behavior, as a result of reduced dimensionality. Bulk perovskite BiFeO3 instead shows antiferromagnetism. The difference in magnetic behavior for nanoparticles compared to bulk behavior, is, in both cases, attributable to finite-size effects.

Original languageEnglish (US)
Title of host publicationAdvances and Applications in Electroceramics
PublisherJohn Wiley and Sons Inc.
Pages211-222
Number of pages12
Volume226
ISBN (Electronic)9781118144480
ISBN (Print)9781118059999
DOIs
StatePublished - Sep 9 2011
Externally publishedYes
EventAdvances and Applications in Electroceramics - Materials Science and Technology 2010 Conference and Exhibition, MS and T'10 - Houston, TX, United States
Duration: Oct 17 2010Oct 21 2010

Publication series

NameCeramic Transactions
Volume226
ISSN (Print)1042-1122

Conference

ConferenceAdvances and Applications in Electroceramics - Materials Science and Technology 2010 Conference and Exhibition, MS and T'10
Country/TerritoryUnited States
CityHouston, TX
Period10/17/1010/21/10

Bibliographical note

Publisher Copyright:
© 2011 The American Ceramic Society.

Keywords

  • Ferromagnetic behabvior
  • Finite size effects
  • Magnetoelectric coupling
  • Nanoscaled multiferroics
  • Single-phase system

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