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17–19 Sept 2018
Fakultät für Maschinenwesen der Technischen Universität München
Europe/Berlin timezone

Lattice dynamics of ultrathin EuO films and interfaces

17 Sept 2018, 14:30
15m
MW 0001 (Fakultät für Maschinenwesen)

MW 0001

Fakultät für Maschinenwesen

Talk P5 Thin films, 2D materials and surfaces Parallel session 5

Speaker

S. Stankov (Karlsruhe Institute of Technology, Karlsruhe, Germany)

Description

Europium monoxide (EuO) is the first rare-earth semiconducting oxide known for its giant magneto-optic Kerr [1] and Faraday [2] effects, metal-insulator transition [3] and anomalous Hall effect [4]. Presently, it is one of the favored candidates for applications as a spin filter in future spintronic devices due to the large exchange splitting of its conduction band [5]. Employing inelastic X-ray scattering, nuclear inelastic scattering and first-principles theory we determined the lattice dynamics of this material and discovered a giant and anisotropic spin-phonon coupling [6]. This imposed the intriguing question about the manifestation of this phenomenon in thin and ultrathin films related to the proposed applications. Using in situ nuclear inelastic scattering on 151Eu we investigated the phonon density of states of EuO films with thickness between 8 nm and of 1 atomic layer. The experimental results unveiled drastic lattice dynamics modifications in the ultrathin EuO films that can be comprehensively understood by the help of first-principles theory.

This work was financially supported by the Helmholtz Association (VHNG-625) and BMBF (05K16VK4).

[1] J. H. Greiner and G. J. Fan, Appl. Phys. Lett. 9, 27 (1966)
[2] K. Y. Ahn, J. Appl. Phys. 41, 1260 (1970)
[3] Y. Shapira, S. Foner, and R. Aggarwal, Phys. Rev. B 8, 2316 (1973)
[4] Y. Shapira, S. Foner, and R. Aggarwal, Phys. Rev. B 8, 2316 (1973)
[5] P. G. Steeneken et al., Phys. Rev. Lett. 88, 047201 (2002)
[6] R: Pradip et al., Phys. Rev. Lett. 116, 185501 (2016)

Primary authors

R. Pradip (Karlsruhe Institute of Technology, Karlsruhe, Germany) P. Piekarz (Polish Academy of Sciences, Krakow, Poland) D. G. Merkel (Hungarian Academy of Sciences, Budapest, Hungary) J. Kalt (Karlsruhe Institute of Technology, Karlsruhe, Germany) O. Waller (Karlsruhe Institute of Technology, Karlsruhe, Germany) A. I. Chumakov (European Synchrotron Radiation Facility, Grenoble, France) R. Rüffer (European Synchrotron Radiation Facility, Grenoble, France) A. M. Oles (Jagiellonian University, Krakow, Poland) K. Parlinski (Polish Academy of Sciences, Krakow, Poland) T. Baumbach (Karlsruhe Institute of Technology, Karlsruhe, Germany) S. Stankov (Karlsruhe Institute of Technology, Karlsruhe, Germany)

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