Anomalous Ferromagnetism of Monatomic Co Wire at the Pt(111) Surface Step Edge
Alexander B. Shick (1), Frantishek Maca (1), and Peter M. Oppeneer (2), ((1) Institute of Physics, ASCR, Prague, Czech Republic, (2), Leibniz-Institute of Solid State, Materials Research, Dresden, Germany)
TL;DR
This study uses first-principles calculations to explore the unusual ferromagnetism of a monatomic Co wire on Pt(111), revealing symmetry-breaking effects, noncollinear moments, and enhanced orbital magnetism with electron correlations.
Contribution
It provides a detailed theoretical analysis of the ferromagnetic properties of a Co monatomic wire at a Pt step edge, including the effects of symmetry breaking and electron correlations.
Findings
Easy magnetization axis at ~20° towards Pt step
Noncollinear Co spin and orbital moments observed
Orbital magnetic moment significantly enhanced with LSDA+U
Abstract
A first-principles investigation of the anomalous ferromagnetism of a quasi-one-dimensional Co chain at the Pt(111) step edge is reported. Our calculations show that the symmetry breaking at the step leads to an easy magnetization axis at an odd angle of {\em towards} the Pt step, in agreement with experiment [P. Gambardella {\em et al.}, {\em Nature} {\bf 416}, 301 (2002)]. Also, the Co spin and orbital moments become noncollinear, even in the case of a collinear ferromagnetic spin arrangement. A significant enhancement of the Co orbital magnetic moment is achieved when modest electron correlations are treated within LSDA+ calculations.
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