Berlin 2005 – scientific programme

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.147: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Absorption spectroscopy and XMCD at the Verwey transition of Fe₃O₄ — •Eberhard Goering, Mirsini Lafkioti, Stefan Gold, and Gisela Schütz — Max-Planck-Insitut für Metallforschung, 70569 Stuttgart

Fe₃O₄ has been investigated since decades, because of its magnetic and unusual electronic transport properties, which exhibit significant changes at the so called Verwey transition. Nevertheless, recent investigations have shown that Fe₃O₄ has a remarkable high spin polarization at the Fermi energy[1], which transfers this system into a promising magnetic layer material for spin electronic devices. We will show detailed magnetic and nonmagnetic absorption spectroscopy results of an in situ cleaved high quality single crystal. We clearly observe a reproducible and very small energy shift (14meV) of the O K edge threshold across the Verwey transition. In addition, our observed orbital moments and the magnetic changes across the Verwey tansition are much smaller and in strong contradiction to recently published data[2]. [1] Dedkov, Yu. S., Rüdiger, U., et al.; Phys. Rev. B 65 (2002) 64417 [2] D.J. Huang et al., Phys.Rev.Lett. 93(2004) 77204