Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Magnetic Heuslers, Half-metals, Semiconductors and Oxides

MA 10.5: Vortrag

Montag, 16. März 2015, 16:00–16:15, H 1012

Induced magnetic monopoles on magnetoelectric surfaces — •Quintin Meier, Michael Fechner, and Nicola A. Spaldin — ETH Zürich, Department for Materials, Zürich, Switzerland

We calculate the magnetic fields caused by a point charge adjacent to the surface of a magnetoelectric, that is a material in which an electric field induces a magnetization and vice versa. The electric point charge induces monopolar and quadrupolar magnetic fields in the magnetoelectric[1]. However in the outside area the field is purely monopolar (B ∝ r⁻²). We show that this behaviour is valid not only for materials with isotropic magnetoelectric responses[2], but for the broader class of uniaxial magnetoelectric materials as well. Moreover, our analysis of the field strength shows that a already single charge near the prototypical uniaxial magnetoelectric, Cr₂O₃, induces a monopolar stray field which should be detectable by experiment. [1] Fechner, M. et al., Phys. Rev. B. 89, 184415 (2014) [2] Qi, X.-L. et al., Science, 323(5), 1184 (2009)