Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Spin Excitations/ Spin Torque

MA 51.6: Vortrag

Freitag, 30. März 2012, 10:45–11:00, H 1012

Life times and chirality of spin-waves in antiferromagnetic and ferromagnetic FeRh: time depedent density functional theory perspective — •Leonid Sandratskii and Pawel Buczek — Max-Planck-Institut für Mikrostrukturphysik, Halle

The first-principles study of the spin excitations in antiferromagnetic (AFM) and ferromagnetic (FM) phases of FeRh is reported. The study is based on the calculation of the transversal dynamic spin susceptibility. We demonstrate that although the Fe atomic moments are well defined there is a number of important phenomena absent in the Heisenberg description: Landau damping of spin waves, large Rh moments induced by the AFM magnons, the formation of the optical magnons terminated by Stoner excitations. We relate the properties of the spin-wave damping to the features of the Stoner continuum and compare the chirality of the spin excitations in AFM, FM and param agnetic systems.