Volume 107, Number 6, September 2014
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 September 2014|
Dzyaloshinskii-Moriya–type interaction and Lifshitz invariant in Rashba 2D electron gas systems
1 Physics Department, M.V. Lomonosov Moscow State University - Leninskie gori, MSU, Moscow, 119991, Russia
2 A.M. Prokhorov General Physics Insitute of the Russian Academy of Science - Vavilova 38, Moscow, 119991, Russia
3 Moscow Institute of Physics and Technology State University - Institutskii per. 9, Dolgoprudny, 141700, Russia
4 P.N. Lebedev Physical Institute of the Russian Academy of Science - Leninskiy prospekt, 53, Moscow, 119991, Russia
Received: 24 March 2014
Accepted: 24 August 2014
The origin of chiral magnetic structures in ultrathin films of magnetic metals is analyzed. It is shown that the Lifshitz-type invariant term in the macroscopic thermodynamic potential can be derived from the spin-orbit Rashba Hamiltonian in two-dimensional electron gas (2DEG). The former is the prerequisite for the existence of spin cycloids, skyrmions and other chiral phenomena observed in thin films. The estimation of the period of spin cycloid gives the value of an order of 10 nm typical for structures reported in the literature.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 71.70.Gm – Exchange interactions
© EPLA, 2014
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