Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.35: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

(001)-textured growth of L1₀-FePt thin films on MgO and Cr seed layers — •Patrick Matthes, Christoph Brombacher, Marcus Daniel, Gunther Beddies, and Manfred Albrecht — Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz - Germany

Chemically ordered FePt has a high uniaxial anisotropy with the easy axis in (001)-direction. It has been shown that (001)-textured MgO [1] and Cr [2] seed layers can be used to stabilize the (001)-texture of L1₀-chemically ordered FePt on amorphous substrates. In this study the growth of MgO and Cr seed layers was optimized by varying the process parameters (deposition temperature and rate as well as Ar pressure) and their influence on the magnetic properties of epitaxially grown FePt films have been analyzed. In addition, reference samples on MgO(100) single crystals were prepared. XRD measurements revealed a high degree of chemical order leading to a K_eff of (8.5± 1.3) × 10⁶ erg/cm³ after FePt deposition at 350 ^∘C. The low deposition temperature results in a smooth film morphology and a reversal behaviour which is dominated by domain wall propagation.

[1] T.Shima et al., APL 81, 1050 (2002)

[2] A.-C. Sun et al., JAP 88, 076109 (2005)