Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Plasmonics and Nanooptics III
O 30.7: Vortrag
Dienstag, 12. März 2013, 12:00–12:15, H31
Magnetic Circular Dichroism PEEM for the study of subwavelength all-optical magnetization switching in TbCo alloys — •Pascal Melchior1, Markus Rollinger1, Philip Thielen1,3, Sabine Alebrand1, Ute Bierbrauer1, Christian Schneider1, Stéphan Mangin2, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Institut Jean Lamour, Université de Lorraine, France — 3Graduate School Materials Science in Mainz, Germany
Magnetization reversal using femtosecond laser pulses is a way to control magnetization without any external magnetic field. Combined with plasmonic antenna structures to focus light below the diffraction limit, plasmon-assisted laser-induced magnetization switching has the potential to revolutionize magnetic data storage. In order to study this phenomenon, an experimental method is needed that provides access to both magnetic as well as near-field properties. We show that photoemission electron microscopy (PEEM) combined with magnetic circular dichroism in the two-photon photoemission has the potential to fulfill this role. In particular, we show that high-anisotropy TbCo alloys, which are known to enable optical control over the magnetization, show a decent dichroic contrast in two-photon photoemission PEEM enabling the imaging of magnetic domains. Furthermore, the possibility of plasmon-assisted magnetization switching on structured TbCo films will be discussed.