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 15.112: Poster

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

Magnetocrystalline anisotropy of 5d-transition-metal chains — •Alexander Thieß, Yuriy Mokrousov, and Stefan Heinze — Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany

The magnetic properties of monoatomic linear chains consisting of 5d transition-metal atoms are investigated using ab initio density functional theory [1]. Ferromagnetic as well as antiferromagnetic configurations are considered in order to find the ground state of the system. Due to the large atomic number and reduced dimensionality the spin-orbit coupling is extremely important and influences the electronic and magnetic properties of these systems significantly. We study the correlation of the spin- and orbital moments with the magnetocrystalline anisotropy energy (MAE), the total energy difference between the configurations with magnetization parallel and perpendicular to the chain axis. Giant values of the MAE up to 40 meV per atom are reached already for the equilibrium interatomic distance, even larger than for 4d-chains [2]. Stretching the chain leads to even higher values of the MAE (up to 120 meV per atom). The nontrivial behavior of the anisotropy energy, and the spin- and orbital moments with respect to the interatomic distance is discussed in detail in terms of the band filling [3].

[1] Y. Mokrousov et al., Phys. Rev. B 72, 045402 (2005)

[2] Y. Mokrousov et al., Phys. Rev. Lett. 96, 147201 (2006)

[3] G. van der Laan, J. Phys.: Condens. Matter 10, 3239-3253 (1998)