Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 27: Half-metals and Oxides (jointly with TT)

MA 27.2: Vortrag

Mittwoch, 28. März 2012, 09:45–10:00, EB 202

Temperature-dependent magnetic properties of cubic La_0.7Sr_0.3MnO₃/SrRuO₃ from first principles — •Danny Böttcher^1,2, Arthur Ernst¹, Igor Maznichenko², and Jürgen Henk^1,2 — ¹Max Planck Institute of Microstructure Physics, Halle, Germany — ²Martin Luther University Halle-Wittenberg, Halle, Germany

Heterostructures of an antiferromagnetic manganite and an itinerant ferromagnet, e. g. La_xSr_1−xMnO₃ combined with SrRuO₃, exhibit fascinating properties due to the interplay between exchange coupling, magnetocrystalline anisotropy, and interfacial quality [1].

We report on a first-principles study of cubic La_0.7Sr_0.3MnO₃/SrRuO₃ and on Monte Carlo simulations in the framework of a classical Heisenberg model. The exchange parameters of the latter as well as the magnetocrystalline anisotropy constants are calculated from first principles. The spin Hamiltonian includes in addition the dipole-dipole interaction and an external magnetic field.

We focus on the temperature dependency of magnetization and hysteresis loops of this exchange-bias system. In particular, correlation functions reveal atom-resolved magnetic properties at the interfaces.

[1] M. Ziese et al., Phys. Rev. Lett. 104 (2010) 167203.