Joon Yang MSE Department Advisor L. Salamanca-Riba MRSEC

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Joon YangMSE DepartmentAdvisor L.
Salamanca-RibaMRSEC IRG 2
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Structural Characterization of Multiferroic
Bi-Fe-O Thin FilmsJoonHyuk Yang, Sung Hwan Lim,
and Lourdes Salamanca-Riba

• BiFeO3 is one of the promising materials for
  practical applications for novel devices, because
  its magnetic and ferroelectric ordering
  temperatures are well above room temperature and
  also it is a lead free ferroelectric material.
  However, one of the problems for practical
  applications is its weak magnetoelectric
  response.
• Another problem is its narrow growth window due
  to volatility of Bismuth. So, only in optimized
  conditions, pure BiFeO3 film can be grown on the
  substrate.
• By changing deposition conditions there can be
  bismuth oxide and iron oxide. In this work, we
  have studied the multiphase formation by changing
  deposition conditions, and found some interesting
  dependence of the magnetic properties with growth
  conditions in Bi-Fe-O system.a
• We are investigating the structure of
  ferroelectric domains at the atomic-level and
  the composition information using by HRTEM, and
  EELS.b

a. Advanced Functional Materials 17, 2594
(2007) b. JoonHyuk Yang, et al. In preparation
(2009)
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Recent MRSEC-Supported Talks and Publications

• Publication H. Lim, M. Murakami, J. H. Yang,
  S.-Y. Young, J. Hattrick-Simpers, M. Wuttig, L.
  Salamanca-Riba and I. Takeuchi, "Enhanced
  Dielectric Properties in Single Crystal-like
  BiFeO3 Thin Films Grown by Flux-mediated
  Epitaxy." Applied Physics Letters 92, 012918/1-3
  (2008).
• TalkSwitching of Ferroelectric Domains in
  Multiferroic BiFeO3  Thin Films, American
  Physical Society Meeting, Portland Oregon, March
  16-19, 2010.