Anomalous Ferromagnetism of Monatomic Co Wire at the Pt(111) Surface Step Edge

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 $\sim 20^{\circ }$ {\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+$U$ calculations.

Presented at MRS Meeting in Boston, Dec. 2003; 4 pages including 3 figures

References in corpus (5)

• Magnetism, Spin-Orbit Coupling, and Superconducting Pairing in UGe${}_2$
• Absence of spontaneous magnetic order at non-zero temperature in one- and two-dimensional Heisenberg and XY systems with long-range interactions
• Coulomb Correlations and Magnetic Anisotropy in ordered $L{1}_0$ CoPt and FePt alloys
• Importance of Correlation Effects on Magnetic Anisotropy in Fe and Ni
• From the bulk to monatomic wires: An ab-initio study of magnetism in Co systems with various dimensionality

Cited by in corpus (10)

• Dzyaloshinskii-Moriya interaction and chiral magnetism in 3$d$-5$d$ zig-zag chains: Tight-binding model and ab initio calculations
• Role of Dzyaloshinskii-Moriya interaction for magnetism in transition-metal chains at Pt step-edges
• Prospect for room temperature tunneling anisotropic magnetoresistance effect: density of states anisotropies in CoPt systems
• Ab-initio spin dynamics applied to nanoparticles: canted magnetism of a finite Co chain along a Pt(111) surface step edge
• Fe clusters on Ni and Cu: size and shape dependence of the spin moment
• Orbital contribution to the magnetic properties of iron as a function of dimensionality
• Thermally activated magnetization reversal in monoatomic magnetic chains on surfaces studied by classical atomistic spin-dynamics simulations
• Orbital moment of a single Co atom on a Pt(111) surface - a view from correlated band theory
• Ab initio study of canted magnetism of finite atomic chains at surfaces
• Orbital contribution to the magnetic properties of nanowires: Is the orbital polarization ansatz justified?