Events Calendar
Other calendars:
Talks Calendar: Colloquiums and Seminars | Internal Calendar of Events (internal only).
Seminar
Magnetic interactions and inelastic scattering effects at the molecular scale
Wednesday, 29 October 2014, 13:30-15:00
Talk given by Dr. Jonas Fransson, Uppsala Universitet, Sweden
Abstract: Magnetic exchange interactions between localized magnetic moments have been
frequently studied for bulk materials over the years. By the advent of meso- and nanoscale
structures that can be deviced in break junctions, semi-conducting heterostructures, and
surfaces, questions about the non-equilibrium properties of such interactions arises.
Especially, since those interactions have a direct impact on the excitation spectrum and,
hence, on the transport properties. Here, I will present recent studies of magnetic exchange
interactions between molecular magnets embedded in a tunnel junction, and show that
these interactions can be very naturally partitioned into three types: (i) isotropic
Heisenberg, (ii) anisotropic Ising, and (iii) anisotropic Dzyaloshinski-Moriya interactions.
The properties of these interactions strongly depend on the back-ground electronic
structure and I, moreover, demonstrate that they can be controlled using external electrical
and thermal fields across the junction. The influence of the interactions on the spin
excitation spectrum can be probed using, e.g., scanning tunneling microscopy techniques,
and I present theoretical results pertaining to recent experimental observations.
References:
J. Fransson, J. Ren, and J. -X. Zhu, Electrical and Thermal Control of Magnetic Exchange
Interactions, arXiv:1401.5592.
J. Fransson, Dynamical exchange interactions between localized spins out of equilibrium,
Phys. Rev. B, 82, 180411(R) (2010).
P. Berggren and J. Fransson, Spin Inelastic Electron Tunneling Spectroscopy on Local
Magnetic Moment Embedded in Josephson Junction, arXiv:1410.2844.
J. Fransson, O. Eriksson, and A. V. Balatsky, Theory of spin-polarized scanning tunneling
microscopy applied to local spins, Phys. Rev. B, 81, 115454 (2010).
J. Fransson, Spin Inelastic Electron Tunneling Spectroscopy on Local Spin Adsorbed on
Surface, Nano Lett. 9, 2414 (2009).
This event is part of the eventgroup INT Talks
Homepage
https://www.int.kit.edu/events.php
https://www.int.kit.edu/events.php
Speaker
Dr. Jonas Fransson, Uppsala Universitet
Uppsala Universitet
Materials Theory http://www.physics.uu.se/en/page/jonas-fransson
Dr. Jonas Fransson, Uppsala Universitet
Uppsala Universitet
Materials Theory http://www.physics.uu.se/en/page/jonas-fransson
Organizer
Dr. Velimir Meded
Institut für Nanotechnologie
KIT
Karlsruhe
Mail: velimir meded ∂ kit edu
Dr. Velimir Meded
Institut für Nanotechnologie
KIT
Karlsruhe
Mail: velimir meded ∂ kit edu
Targetgroup
Interested / Everyone
Interested / Everyone