Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Focus Session: Chiral Domain Walls in Ultrathin Films (organized by MA)

TT 60.1: Topical Talk

Mittwoch, 2. April 2014, 09:30–10:00, BEY 118

On the rediscovery of the Dzyaloshinskii-Moriya interaction—A review — •Matthias Bode — Physikalisches Institut, Experimentelle PhysikUniversität Würzburg II, , Am Hubland, D-97074 Würzburg, Germany

Even though it had already been theoretically predicted in 1960 [1,2] that the spin-orbit–driven Dzyaloshinskii–Moriya interaction (DMI) may lead to chiral spin structures in magnetic systems with broken inversion symmetry, this term was largely ignored for decades. This is particularly astonishing as experimental progress allowed the preparation of increasingly subtle magnetic structures which feature surfaces and interfaces or even—as in the case of magnetic nanostructures—exclusively consist of surfaces and interfaces. Obviously, in all these sample geometries inversion symmetry is broken and a sufficiently strong spin-orbit coupling should lead to chiral magnetism [3]. In this talk I will review why the importance of the DMI interaction in thin film and nano magnetism was overlooked for so long, and how scientific persistence [4] eventually led to irrefutable evidence that it not only exists [5] but in some (if not many) cases strongly influences [6,7] or even dominates magnetic order.

[1] I.E. Dzialoshinskii, Sov. Phys. JETP 5, 1259 (1957).
T. Moriya, Phys. Rev. 120, 91 (1960).
A. Bogdanov and A. Hubert, J. Magn. Magn. Mat. 138, 255 (1994).
A. Bogdanov and U. Rößler, Phys. Rev. Lett. 87, 037203 (2001).
M. Bode et al., Nature 447, 190 (2007).
M. Heide et al., Phys. Rev. B 78, 140403 (2008).
S. Meckler et al., Phys. Rev. Lett. 103, 157201 (2009).