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Bachelor thesis: Single crystal growth and macroscopic characterization of YxLu1-xFe2O4

Advertising institute: JCNS-2 - Scattering Methods
Reference number: D013/2013, Physics

Multiferroics are one method to solve the heat problem in magnetic storage devices. LuFe2O4 has attracted attention as a multiferroic material with ferroeletricity driven by charge ordering [1], but was later found to be not ferroelectric [2]. In principle the mechanism could be applicable to other rare earth ferrites. YxLu1-xFe2O4 crystals should be grown using the traveling floating zone method in an optical mirror furnace. With this technique highly stoichiometric crystals of pure LuFe2O4 and isostructural YFe2O4 crystals were grown by former Ph.D. and Diploma students.
Substituted crystals are desired to understand the differences between the two systems, present in spin and charge ordering. The grown crystals would later be used in large scale x-ray or neutron experiments. The work will be carried out in an international environment of the Helmholtz Young Investigators Group ‘Complex Ordering Phenomena in Multifunctional Oxides’ at JCNS-2 / PGI-4 of the Forschungszentrum Jülich, in close cooperation to an ongoing Ph.D. thesis. 
[1]  N. Ikeda et al., Nature (London) 436, 1136 (2005).
[2] J. de Groot, T. Mueller, R.A. Rosenberg, D.J. Keavney, Z. Islam, J.-W. Kim, M. Angst, Phys. Rev. Lett. 108, 187601 (2012)

Contact persons: Thomas Müller, Manuel Angst,