Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-01-26
Phys. Rev. B 81, 054433 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
accepted for publication in Phys. Rev. B
Scientific paper
Using first-principles calculations, we study the magnetism of 5d transition-metal atomic junctions including structural relaxations and spin-orbit coupling. Upon stretching monatomic chains of W, Ir, and Pt suspended between two leads, we find the development of strong magnetism and large values of the magnetocrystalline anisotropy energy (MAE) of up to 30 meV per chain atom. We predict that switches of the easy magnetization axis of the nanocontacts upon elongation should be observable by ballistic anisotropic magnetoresistance measurements. Due to the different local symmetry, the contributions to the MAE of the central chain atoms and chain atoms in the vicinity of the leads can have opposite signs which reduces the total MAE. We demonstrate that this effect occurs independent of the chain length or geometry of the electrodes.
Heinze Stefan
Mokrousov Yuriy
Thiess Alexander
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