MSE 2016 - Full Program

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Lecture

Multiferroic clusters: a new perspective for relaxor-type room-temperature multiferroics

Wednesday (28.09.2016)
11:30 - 11:45
Part of:


In ceramics of the composition (BiFe0.9Co0.1O3)0.4-(Bi1/2K1/2TiO3)0.6, novel nano-sized regions called multiferroic clusters (MFC) were found using piezoresponse force microscopy (PFM) and magnetic force microscopy (MFM). The MFC exhibit exceptionally large direct and converse ME coupling, α ≈ 1.0 x 10-5 s/m (dE/dH ≈ 1.3 kV/(cm Oe)) effect which was found locally, using in-situ PFM under magnetic field and MFM in combination with tip induced poling (see Figure 1).

It is assumed that ferrimagnetic order is established in those regions due to higher concentration of Fe and Co as confirmed by secondary ion mass spectrometry (SIMS). At the same time, these regions exhibit a lower concentration of the charge disorder inducing BKT component, which leads to simultaneous long range FE order. The material’s exceptionally large Néel temperature TN = 670 ± 10 K, as found by neutron diffraction, is proposed to be a consequence of ferrimagnetic order in MFC.

 

Speaker:
Dr. Leonard Henrichs
Karlsruhe Institute of Technology (KIT)
Additional Authors:
  • Dr. Oscar Cespedes
    University of Leeds
  • Dr. James Bennett
    University of Leeds
  • Joachim Landers
    University of Duisburg-Essen
  • Soma Salamon
    University of Duisburg-Essen
  • Dr. Christian Heuser
    University of Duisburg-Essen
  • Dr. Thomas Hansen
    Institut Laue-Langevin
  • Tim Helbig
    Technical University of Darmstadt
  • Prof. Dr. Oliver Gutfleisch
    Technical University of Darmstadt
  • Prof. Dr. Doru Lupascu
    University of Duisburg-Essen
  • Prof. Dr. Heiko Wende
    University of Duisburg-Essen
  • Prof. Dr. Wolfgang Kleemann
    University of Duisburg-Essen
  • Prof. Dr. Andrew Bell
    University of Leeds