Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Spin-dependent transport phenomena

MA 54.8: Vortrag

Freitag, 16. März 2018, 09:45–10:00, EB 301

Theoretical description of the electric-field induced XMCD at a ferromagnet/non-magnet interface — •Alberto Marmodoro, Sebastian Wimmer, and Hubert Ebert — Dept. Chemie, LMU, München

Bidimensional heterostructures composed of magnetic and non-magnetic materials allow to investigate how spin polarization effects do not cease abruptly at the interface, but extend across it and give rise to a variety of phenomena, that are typically controlled by the details of composition and geometry. Recent experiments [1-2] have furthermore explored how this situation is changed by application of an electric field that drives a steady flux of carriers through the subsystems, and thus go well beyond a ground state regime. We consider in particular X-ray absorption (XAS) and magnetic circular dichroism (XMCD) measurements [3] which can provide element -resolved insight on spin accumulation and its dependence on the direction and magnitude of an external stimulus on top of static, proximity induced influences. This setup is investigated within the spin-polarized relativistic multiple scattering framework (SPRKKR) making use of recent developments [4-5] for the non-equilibrium Green function (NEGF) description of spectroscopy in real materials.

(1) R. Kukreja et al., Phys.Rev.Lett. 115, 096601, (2015)

(2) G. van der Laan, Physics 8, 83, (2015)

(3) H. Ebert, Rep.Prog.Phys. 59, 1665, (1996)

(4) S. Achilles et al., Phys.Rev.B 88, 125411, (2013)

(5) M. Ogura et al., J.Phys.Soc.Japan 85, 104715, (2016)