Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Surface and Interface Magnetism I (O jointly with MA)
O 51.7: Vortrag
Mittwoch, 2. April 2014, 12:00–12:15, WIL C107
Emergent phenomena induced by spin orbit coupling in photoemission from ultrathin ferromagnetic films — •L. Plucinski1,2, M. Eschbach1, I. Aguilera3, G. Bihlmayer3, S. Blügel3, and C. M. Schneider1,2 — 1PGI-6, FZ Jülich — 2Fakultät f. Physik, Uni Duisburg-Essen — 3PGI-1 and IAS-1, FZ Jülich
The existence of easy magnetization axis reduces the crystal symmetry and may manifest itself in lifting the degeneracy of electronic band dispersions along otherwise symmetrical directions in reciprocal space.
In non-magnetic materials spin orbit coupling (SOC) may cause the lifting of the spectral degeneracy of certain surface or bulk bands by means of Rashba or Dresselhaus effects. However, only combining SOC with ferromagnetism offers the possibility of remanent magnetic swapping of the non-degenerate directions which results in discrete switching of the electronic states for certain wave vectors in the Brilloin zone.
We will show the prediction of such phenomena for several monolayers thick films of Fe(001), which have 4-fold in plane easy magnetization axis. The energy scale of the predicted effect (from 20 to 200 meV) is several times larger than the resolution of the state-of-the-art angle-resolved photoemission (ARPES) experiment when performed on cryocooled samples.
Reciprocal space constant energy contours measured by ARPES will be compared with the electronic band structures of Fe calculated using the LDA and GW approximations. Interplay between initial state and photoemission dichroic effects will be discussed.