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DS: Fachverband Dünne Schichten

DS 45: Thin Film Properties: Structure, Morphology and Composition III

DS 45.1: Vortrag

Freitag, 20. März 2020, 09:30–09:45, CHE 89

L1₀-ordered ferrimagnetic Fe_100−xCr_xPt(001) thin films. — •Nataliia Schmidt¹, Ritwik Mondal², Andreas Donges², Laszlo Szunyogh³, Ulrich Nowak², and Manfred Albrecht¹ — ¹Institute of Physics, University of Augsburg, Germany — ²Department of Physics, University of Konstanz, Germany — ³Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary

Tuning the properties of hard magnetic L1₀ FePt thin films is of high interest from a fundamental as well as technological point of view[1]. In this regard, 10 nm thick (Fe_100−xCr_x)₅₀Pt₅₀ films (where x= 0−100 at.%) were prepared by epitaxial growth on MgO(100) substrates at 800^∘C. All samples reveal pronounced L1₀ chemical ordering. Strong perpendicular magnetic anisotropy (PMA) at 300 K persists up to 20 at.% Cr on Fe sites in L1₀ lattice. With addition of 45 at.% Cr, PMA gets strongly reduced. The coercive field in out-of-plane direction decreases from 42.94 kOe to 10.82 kOe with addition of 20 at.% Cr, which is attributed to a strong modification of the film morphology changing from island-like to a more continuous film. Depending on the Cr concentration, magnetic moments of Fe and Cr experience strong frustration due to antiferromagnetic coupling of Fe-Cr and Cr-Cr, but ferromagnetic interaction between Fe-Fe. For direct comparison with our experiments ground state as well as thermal properties were calculated within the framework of atomistic spin model simulations where the model parameters rest on first principles calculations.

[1] N. Y. Schmidt et al., Phys. Rev. B 100, 064428 (2019).