Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Magnetic Imaging and Scattering Techniques
MA 24.3: Vortrag
Mittwoch, 13. März 2013, 10:00–10:15, H22
Imaging of magnetic domains in TbCo alloys with magnetic circular dichroism in two-photon photoemission electron microscopy — •Markus Rollinger1, Pascal Melchior1, Philip Thielen1,2, Sabine Alebrand1, Ute Bierbrauer1, Christian Schneider1, Stéphan Mangin3, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Germany — 3Institut Jean Lamour, Université de Lorraine, France
We use magnetic circular dichroism in two-photon photoemission to image the magnetic domains of TbCo thin films with a photoemission electron microscope (PEEM). With a Time-of-flight analyzer we perform time- and energy-resolved measurements with a spatial resolution of only a few tens of nanometers. As excitation source, we use the second harmonic (3,1eV photon energy) of a Ti:sapphire oscillator. The two-photon-photoemission process delivers a distinctively visible magnetic circular dichroism, whose strength depends strongly on the kinetic energy of the observed photoemitted electrons.
We present a detailed analysis of the energy-resolved PEEM dichroism spectra and explain the origin of the observed effect. These results open the way to the investigation of all-optical control of the magnetization in high-anisotropy rare earth-transition metal alloys [1] by means of energy- and time-resolved PEEM.
[1] S. Alebrand et al., Applied Physics Letters 101, 162408 (2012)