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000010052 084__ $$2WoS$$aPhysics, Condensed Matter
000010052 1001_ $$0P:(DE-Juel1)VDB78175$$aThiess, A.$$b0$$uFZJ
000010052 245__ $$aCompeting magnetic anisotropies in atomic-scale junctions
000010052 260__ $$aCollege Park, Md.$$bAPS$$c2010
000010052 300__ $$a054433
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000010052 440_0 $$04919$$aPhysical Review B$$v81$$x1098-0121$$y5
000010052 500__ $$aFinancial support of the Stifterverband fur die Deutsche Wissenschaft is gratefully acknowledged. We also thank Phivos Mavropoulos for discussions.
000010052 520__ $$aUsing first-principles calculations, we study the magnetism of 5d transition-metal atomic junctions including structural relaxations and spin-orbit coupling. Upon stretching monoatomic 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.
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000010052 7001_ $$0P:(DE-Juel1)VDB37182$$aMokrousov, Y.$$b1$$uFZJ
000010052 7001_ $$0P:(DE-HGF)0$$aHeinze, S.$$b2
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