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MA: Fachverband Magnetismus
MA 40: Surface magnetism II (jointly with O)
MA 40.5: Vortrag
Mittwoch, 16. März 2011, 16:00–16:15, CHE 184
Magnetism of ultrathin Fe layers on BaTiO3(001) — •Remya Kunjuveettil Govind1, Vasili Hari Babu2, Federica Bondino3, Marco Malvestuto3, Martin Trautmann1, Karl-Michael Schindler1, and Reinhard Denecke2 — 1Institut fur Physik, Martin-Luther-Universität Halle-Wittenberg — 2Wilhelm-Ostwald-Institut fur Physikalische und Theoretische Chemie, Universität Leipzig — 3IOM CNR, Laboratorio Nazionale TASC, Area Science Park, Basovizza, Italy
Multiferroic systems are promising candidates for switching magnetization using voltages. Layered systems from ultrathin magnetic films on ferroelectric substrates are model systems. In this study ultrathin layers of Fe are deposited on a BaTiO3(001) substrate and characterized by XPS, AES, NEAXFS and LEED. X-ray circular dichroism (XMCD) measurements in remanent magnetization show no magnetization for thicknesses up to 6 Å, in contrast to theoretical predictions [1]. From 8 to 28 Å, the XMCD spectra clearly show in-plane magnetization and the XMCD spectra look like bulk Fe. However, the dichroism is smaller and values for orbital and spin magnetic moments derived from a sum rule analysis are significantly smaller than bulk values. Possible reasons for this behavior, like partial oxidation of the Fe layer or non-uniform layer growth will be discussed.
[1] M. Fechner et al., Phys. Rev. B 78 (2008) 212406; M. Fechner et al., Phys. Stat. Sol. B 1 (2010) 8.