Spin moments, orbital moments and magnetic anisotropy of finite-length Co wires deposited on Pd(110)

Félix-Medina, R.E.; Dorantes-Dávila, J.; Pastor, G.

doi:10.1088/1367-2630/4/1/3a0

Cited by 36 publications

(29 citation statements)

References 36 publications

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“…[25]) and the magnetic anisotropy energy per Co atom present oscillations as a function of the chain thickness. This behavior appears to be specific for 1D metal systems and had been predicted by tight-binding calculations for both freestanding [40] and 1D Co chains deposited on Pd [42]. The easy axis, however, lies always in the plane perpendicular to the chains and is canted with respect to the surface normal owing to symmetry breaking at the Pt step edges [37,38].…”

Section: 3mentioning

confidence: 66%

“…These findings and their interpretation in terms of (de)localization of the Co 3d VINDIGNI et al Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems 387 states are discussed in more detail in Refs. [23,25,39] and in tight-binding [40][41][42] as well as ab initio electronic calculations [32-38, 43, 44] relative to 1D metal systems. In the following, we intend to focus on the coupling between Co atoms in the chains and on the consequences of the strong magnetic anisotropy on the stabilization of magnetic order.…”

Section: Local Magnetic Momentsmentioning

confidence: 99%

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Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems

et al. 2005

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We present a combined experimental and theoretical study of the magnetization of one-dimensional atomic cobalt chains deposited on a platinum surface. We discuss the intrinsic magnetization parameters derived by X-ray magnetic circular dichroism measurements and the observation of ferromagnetic order in one dimension in connection with the presence of strong, dimensionality-dependent anisotropy energy barriers of magnetocrystalline origin. An explicit transfer matrix formalism is developed to treat atomic chains of finite length within the anisotropic Heisenberg model. This model allows us to fit the experimental magnetization curves of cobalt monatomic chains, measured parallel to the easy and hard axes, and provides values of the exchange coupling parameter and the magnetic anisotropy energy consistent with those reported in the literature. The analysis of the spin-spin correlation as a function of temperature provides further insight into the tendency to magnetic order in finite-sized one-dimensional systems.

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Section: 3mentioning

confidence: 66%

Section: Local Magnetic Momentsmentioning

confidence: 99%

Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems

et al. 2005

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“…10 Also, the magnetic anisotropy energy ͑MAE͒ of a 1D infinite chain is calculated to be an order of magnitude larger than that for 2D thin films. 11, 12 Wu et al calculated the MAE of monoatomic Co on different substrates and found that the MAE of Co is enhanced from 0.02 meV/ atom on Cu͑001͒ to 2.58 meV/ atom on Pt͑001͒ due to the strong spin-orbit coupling of Pt. 13 In the present work we explore both the growth mode and magnetic properties of Fe grown on a Pt͑997͒ surface in the coverage range of 0-4 ML.…”

Section: Introductionmentioning

confidence: 99%

Step-decorated Ferromagnetic Fe Nanostripes on Pt(997)

et al. 2005

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We investigate the step decoration growth and magnetic properties of Fe grown on a Pt͑997͒ vicinal single crystal by means of reflection high energy electron diffraction ͑RHEED͒, scanning tunneling microscopy ͑STM͒, and the surface magneto-optical Kerr effect ͑SMOKE͒. Pt͑997͒ has 2 nm wide, ͑111͒-oriented terraces separated by ordered, monoatomic steps along the ͓110͔ direction. The Fe is grown at room temperature as wedges with thickness ranging from 0 to 4 monolayers ͑ML͒. RHEED and STM show that Fe stripes form at low coverage due to step decoration. SMOKE data taken along a wedge indicate that the Fe is ferromagnetic above 0.2 ML with its magnetic easy axis canted from surface normal direction. As temperature is increased near the Curie temperature, there is an irreversible spin reorientation to the perpendicular out-of-plane direction. The canting can be understood as arising from a competition between an in-plane, step-induced magnetic anisotropy and a perpendicular surface anisotropy associated with extended terraces due to the polarization of the proximal Pt. Above 1.7 ML the perpendicular easy axis reorients to in-plane, along the step direction, due to the dominance of the shape anisotropy. The magnetic anisotropy energy is extracted by fitting the temperature dependence of the coercivity data.

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“…Previous studies have shown that infinite mono-atomic chains show very large MAEs and orbital magnetic moments, which are in general far more important than in thin films or small compact clusters [8,11]. Furthermore, the enhancement is amplified in finite-length chains, which in addition show a remarkable nonmonotonic dependence of the MAE as a function of length.…”

Section: From Monoatomic Wires To 2d Monolayersmentioning

confidence: 95%

Spin-reorientation transitions in one-dimensional and two-dimensional magnetic nanostructures

Dorantes-Dávila¹,

Pastor

2005

Phase Transitions

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The magnetic anisotropy energy (MAE) of 3d transition-metal wires, stripes, and films is calculated self-consistently as a function of stripe width and film thickness. The magnetization-reorientation transitions in stripes are determined along the crossover from the mono-atomic one-dimensional chain to the twodimensional monolayer. It is shown that the MAE oscillates as a function of stripe width and depends strongly on the considered transition metal. The reorientation transitions in Co films deposited on a highly polarizable substrate such as Pd are discussed. A local analysis of the layer-resolved MAEs provides new insights into the off-plane magnetization observed in Pd-capped Co films on Pd(111). The interfaces responsible for the stability of the off-plane easy axis are characterized microscopically. An unexpected internal magnetic structure of the Co-Pd interfaces is revealed in which the magnetic moments and spin-orbit interactions at Pd atoms play a crucial role. The nature of the reorientation transition from perpendicular to in-plane magnetization with increasing film thickness is studied by means of full-vectorial calculations. The existence of a spin-canted phase at intermediate film thickness is demonstrated.

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Spin moments, orbital moments and magnetic anisotropy of finite-length Co wires deposited on Pd(110)

Cited by 36 publications

References 36 publications

Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems

Finite-sized Heisenberg chains and magnetism of one-dimensional metal systems

Step-decorated Ferromagnetic Fe Nanostripes on Pt(997)

Spin-reorientation transitions in one-dimensional and two-dimensional magnetic nanostructures

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