Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.117: Poster

Tuesday, March 27, 2007, 15:00–19:00, Poster A

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

Transition-metal nanowires are very attractive systems to study the interplay of low dimensionality and magnetism. The results of recent experiments indicate the existence of noncollinear order in ferromagnetic nanowires [1,2]. However, for systems with a large number of magnetic degrees of freedom a direct unambiguous measurement of the magnetic configuration is quite impossible without preliminary theoretical considerations. In this respect the predictive role of first-principles calculations is of great importance. We have developed a new version of the screened Korringa-Kohn-Rostoker (KKR) method that can suitably be applied to noncollinear magnetic systems. In terms of this method we calculate both the diagonal and the off-diagonal elements of the spin density matrix from which we obtain information for both the magnitudes and the directions of the local moments. We performed ab initio calculations for magnetic nanowires suspended between two semi-infinite leads. These three parts of the system were treated on the same footing without adjustable parameters. We point out the possibility of the formation of noncollinear magnetic states in Ni, Co and Fe nanowires. In addition, the influence of the magnetic anisotropy on the magnetic order will be discussed.

[1] V. Rodrigues et al., Phys.Rev.Lett. 91, 096801 (2003)

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