Dresden 2011 – scientific programme

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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 63.19: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Magnetic properties and configuration of Fe₅₀Pt_50*xRh_x films — •Jochen Fenske¹, Dieter Lott¹, Wolfgang Schmidt², Karin Schmalzl², Gary J. Mankey³, Frank Klose⁴, Helena Tartakowskaya⁵, and Andreas Schreyer¹ — ¹Helmholt-Zentrum Geesthacht, Germany — ²IFF Forschungszentrum Juelich, JCNS at ILL, France — ³MINT Center, University of Alabama, USA — ⁴Ansto, Bragg Institute, Australia — ⁵Institute for Magnetism, National Accademy of Scinece, Ukraine

Ordered FePt alloys with L1₀ structure are known as materials with FM order and a high magnetic moment of Fe providing a large mangetization. The large atomic number of Pt on the other hand results in a high magnetic anisotropy. If grown in thin films, the high anisotropy often results in perpendicular magnetization which is the preferred orientation for current magnetic recording media. One way to control the magnetic properties in these materials is through the introduction of a third element into the crystal matrix e.g. Rh. When Rh is added to replace Pt in the equiatomic alloy, new magnetic phases emerge. Here we present neutron diffraction studies on the magnetic properties of different 200nm thick Fe₅₀Pt_50*xRh_x films in dependce of the temperature and external magnetic fields. Additional resonant x-ray measurements on the Fe and Pt absorption edges provide additional information about the magnetic moments on these sites.