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MA: Fachverband Magnetismus
MA 30: Experimental methods and magnetic imaging
MA 30.5: Talk
Wednesday, April 2, 2014, 16:00–16:15, HSZ 403
Imaging of magnetic domains in TbCo alloys through different capping layers using valence band photoemission magnetic circular dichroism — •Philip Thielen1,2, Markus Rollinger1, Pascal Melchior1, Ute Bierbrauer1, Sabine Alebrand1, Christian Schneider1, Michel Hehn3, Stéphane Mangin3, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Physics Department and Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Graduate School of Excellence Materials Science in Mainz, Kaiserslautern, Germany — 3Institut Jean Lamour, Université de Lorraine, France
Imaging of magnetic domains of uncapped terbium cobalt (TbCo) alloy thin films is achievable using magnetic circular dichroism in two-photon photoemission electron microscopy (PEEM)[1]. Here we show imaging of magnetic domains of TbCo alloy thin films through a variety of capping layers. The domain patterns appear identical for samples without and with capping layer but have opposite contrast. Using a time-of-flight detector, we record energy distribution spectra of the photoelectrons. While the MCD signal of uncapped samples depends strongly on the photoelectron spectrum and even shows a sign change in a narrow energy range, we find neither a kinetic energy dependence nor a sign change of the MCD signal for capped samples. We discuss the origin of the magnetic asymmetry in case of the capped samples, distinguishing whether the electrons originate from the capping layer or the underlying TbCo layer itself.
[1] P. Melchior et al., Phys. Rev. B 88, 104415 (2013).