Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.40: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Noncollinear magnetic order in transition metal nanowires — •Michael Czerner, Bogdan Yu. Yavorsky, and Ingrid Mertig — Martin Luther University, FB Physik, FG Theorie, D-06099 Halle, Germany

Metal nanowires are very attractive systems to study the role of low dimensonality in the magnetic properties. The results of recent experiments indicate the existence of noncollinear magnetic order in metallic nanowires [1,2]. However, for the systems with a large number of the magnetic degrees of freedom direct unambiguous measurements of the magnetic configuration without preliminary model assumptions are impossible. In this respect the predictive role of the first-principle calculations is of great importance. We have developed a modification of the (screened) KKR method to noncollinear magnetic systems. We calculate both diagonal and off-diagonal elements of the spin density matrix to get information about the direction of the local moment.

We present ab initio calculations of magnetic nanowires suspended between two semi-infinite leads and discuss the possibility of the formation of noncollinear magnetic structures in the Ni,Co, and Fe nanowires. In addition, we calculate the electronic transport through the nanowire using the Landauer approach in the formulation of Baranger-Stone [3].

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

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

[3] H.U. Baranger and A.D. Stone, Phys.Rev.B 40, 8169 (1989)