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 63.83: Poster

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

Magnetic polarizability of Rh atoms and spin-waves in FeRh. — •Leonid Sandratskii, Pawel Buczek, and Arthur Ernst — Max Planck Institute of Microstructure Physics, Halle, Germany

Recent femtomagnetic experiments revealed a sub-picosecond generation of the magnetisation after laser irradiation of antiferromagnetic FeRh. This strongly enhanced the interest in the magnetic dynamics and thermodynamics of this system. The available first-principles theories of the properties of FeRh outside the ground state differ cardinally in the treatment of magnetic excitations. This, in particular, concerns the account for the appearance of the induced Rh moment in the antiferromagnetic phase and the variable value of the Rh moment in the ferromagnetic phase. We report the calculation of the spin-waves in the antiferromagnetic and ferromagnetic FeRh with account for the specific properties of the Rh moment. The study is performed within both frozen magnon and dynamic susceptibility approaches. The comparison of the results of two approaches is given.