Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Magnetic anisotropy in thin films
MA 47.3: Vortrag
Donnerstag, 4. April 2019, 12:00–12:15, H53
L10-ordered ferrimagnetic FeCrPt thin films — •Nataliia Safonova1, Florin Radu2, Hanjo Ryll2, Chen Luo2,3, and Manfred Albrecht1 — 1Institute of Physics, University of Augsburg, Universitätsstrasse 1, D-86159, Augsburg, Germany — 2Helmholtz-Zentrum Berlin, D-14109 Berlin, Germany — 3Experimental Physics of Functional Spin Systems, Technische Universität München, James-Franck-Str. 1, 85748 Garching b. München, Germany
New magnetic materials designed for ultrafast all-optical switching (AOS) of magnetization are of high interest from a fundamental as well as technological point of view [1]. It was demonstrated that a low-remanent magnetization is a crucial criterion for AOS in ferrimagnets [2]. In this regard, a series of ((Fe(100-x)Cr(x))50Pt50 alloy thin films with a thickness of about 10 nm were prepared by epitaxial growth on MgO(100) substrates at 800°C. The Cr content x was varied in the range 0 - 100 at.%. All samples in the series reveal pronounced L10 chemical ordering. With substitution of Fe by Cr in L10 lattice up to 20% strong PMA is observed at 300 K. However, with further addition of Cr, PMA as well as coercivity get strongly reduced, which is accompanied by the film morphology change from island-like growth to more continuous film structure. Furthermore, x-ray magnetic circular dichroism studies at the Fe and Cr L3,2 edges revealed a strong antiferromagnetic coupling between Fe and Cr, which resulted in a reduction in net magnetization of the film.
[1] A. Kirilyuk et al., Rev. Mod. Phys. 82, 2731 (2010).
[2] A. Hassdenteufel et al., Phys. Rev. B 91, 104431 (2015).