Regensburg 2010 – wissenschaftliches Programm
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KR: Fachverband Kristallographie
KR 10: Poster: Multiferroics (with MA, DF, KR, DS)
KR 10.58: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Magnetically Induced Optical Nonlinearity in the Centrosymmetric Ferromagnetic Semiconductor EuO — •Masakazu Matsubara1, Andreas Schmehl2, Jochen Mannhart2, Darrell Schlom3, and Manfred Fiebig1 — 1HISKP, Universität Bonn, Germany — 2Institut für Physik, Universität Augsburg, Germany — 3Department of Materials Science and Engineering, Pennsylvania State University, USA
EuO is a magnetic semiconductor, which undergoes a ferromagnetic transition at the Curie temperature (TC) of 69 K. This material exhibits some extreme properties such as a huge colossal magnetoresistance (CMR) effect, the largest magneto-optical effect for any material, and nearly 100% spin polarization of the charge carriers in the ferromagnetic state. These outstanding properties make EuO a very attractive candidate for the basic and applied science of spintronics.
Here we report about the linear and nonlinear optical properties in epitaxial EuO, into which oxygen vacancies are introduced, grown on a YAlO3 substrate. Even though EuO has a centrosymmetric crystal structure, second-harmonic generation (SHG) was observed below TC at the two-photon transition energies from the 4f to the 5d states of Eu2+. The results of the temperature and magnetic field dependent measurements suggest a close correlation between SHG and magnetization. The symmetry analysis provides access to the microscopic origin of this magnetically induced SHG signal.
This work was supported by the Alexander von Humboldt Foundation.