Regensburg 2013 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 22: Poster II
DF 22.38: Poster
Friday, March 15, 2013, 10:30–13:30, Poster D
All-optical switching in CoTb alloys: composition and thickness dependent studies — •Ute Bierbrauer1, Sabine Alebrand1, Michel Hehn2, Matthias Gottwald2,3, Daniel Steil1, Daniel Lacour2, Mirko Cinchetti1, Martin Aeschlimann1, Eric E. Fullerton3, and Stéphane Mangin2 — 1Dep. of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2IJL, Université de Lorraine, Nancy, France — 3University of California, San Diego, USA
All-optical switching (AOS), i.e. switching of magnetic domains by means of circularly polarized fs laser pulses, has been demonstrated up to now only in GdFeCo [1]. However, it is still not clear if AOS is related to the specific properties of GdFeCo or if it also occurs in other materials.
We focus on AOS in high anisotropy CoTb alloys [2], demonstrating that AOS is possible for a certain Tb concentration range. Interestingly this concentration range corresponds to the one where the compensation point is above room temperature. We further investigate the dependence of AOS on the film thickness. Overall we discuss possible influences of the material specific magnetic properties, like e.g. the coercive field and the saturation magnetization. We find indications that such properties cannot be ignored, when trying to get a deeper understanding of AOS.
[1] C.D. Stanciu et al., PRL 99, 047601 (2007) [2] S. Alebrand et al., APL 101, 162408 (2012)