Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.76: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Noncollinear magnetic order in transition-metal nanowires — •Michael Czerner¹, Bogdan Yu. Yavorsky¹, Laszlo Szunyogh², and Ingrid Mertig¹ — ¹Department of Physics, Martin Luther University, Germany — ²Department of Theoretical Physics, Budapest University of Technology and Economics, Hungary

The progress in nanotechnology during the last two decades stimulated interest in ferromagnetic nanocontacts [1,2]. The transport properties of the nanocontacts depend strongly on the details of the magnetic structure. In particular, in the presence of a domain wall the magnetic configuration becomes noncollinear. On the other hand there are experimental indications [3], that the magnetic anisotropy has considerable effect on the magnetic structure of the nanocontact. A direct measurement of the magnetic configuration is difficult. In this respect first-principle calculations of the magnetic structure of the nanocontact are of primary importance. We present ab initio calculations of ferromagnetic nanowires suspended between two semi-infinite leads of the same material. The system was treated without adjustable parameters. We calculated the electronic and magnetic structure by means of the screened Korringa-Kohn-Rostoker (KKR) Greens function method in the relativistic formulation. We demonstrate that the ground state shows noncollinear magnetic order in Ni, Co and Fe nanowires. The influence of the magnetic anisotropy on the magnetic order is discussed.

[1] M.R. Sullivan et.al. , Phys.Rev.B 71, 024412 (2005)

[2] H.D. Chopra et.al. , Nat. Mat. 4, 832 (2005)

[3] M. Viret et.al. , cond-mat/0602298