Giant Magnetic Anisotropy of Single Cobalt Atoms and Nanoparticles

@article{Gambardella2003GiantMA,
  title={Giant Magnetic Anisotropy of Single Cobalt Atoms and Nanoparticles},
  author={Pietro Gambardella and Stefano Rusponi and Marco Veronese and Sarnjeet Dhesi and Cesare Grazioli and A. Dallmeyer and Ivan Cabria and R. Zeller and Peter H. Dederichs and Klaus Kern and Carmelita Carbone and Harald Brune},
  journal={Science},
  year={2003},
  volume={300},
  pages={1130 - 1133}
}
The isotropic magnetic moment of a free atom is shown to develop giant magnetic anisotropy energy due to symmetry reduction at an atomically ordered surface. Single cobalt atoms deposited onto platinum (111) are found to have a magnetic anisotropy energy of 9 millielectron volts per atom arising from the combination of unquenched orbital moments (1.1 Bohr magnetons) and strong spin-orbit coupling induced by the platinum substrate. By assembling cobalt nanoparticles containing up to 40 atoms… Expand

Topics from this paper

Large Magnetic Anisotropy of a Single Atomic Spin Embedded in a Surface Molecular Network
TLDR
First-principles calculations indicate that the magnetic atoms become incorporated into a polar covalent surface molecular network in the copper nitride, which has the potential for engineering anisotropies large enough to produce stable magnetization at low temperatures for a single atomic spin. Expand
Magnetic anisotropy of single Co atom on CuN surface
The magnetic anisotropy energy for a single Co atom on CuN/Cu(001) surface is investigated making use of the first-principles relativistic local spin density approximation (LSDA) calculations and theExpand
Large perpendicular magnetic anisotropy of single Co atom on MgO monolayer: A first-principles study
Realizing the magnetic bit with a single atom is the ultimate goal for magnetic storage. Based on density functional theory, the magnetic anisotropy (MA) of single Co atom on MgO monolayer has beenExpand
Magnetic anisotropy of single 3d spins on CuN surface
First-principles calculations of the magnetic anisotropy energy for Mn- and Fe-atoms on CuN/Cu(001) surface are performed making use of the torque method. The easy magnetization direction is found toExpand
Magnetic phases of cobalt atomic clusters on tungsten.
First-principle calculations are employed to show that the magnetic structure of small atomic clusters of Co, formed on a crystalline W(110) surface and containing 3-12 atoms, strongly deviates fromExpand
Stabilizing the magnetic moment of single holmium atoms by symmetry
TLDR
It is shown that the magnetic moments of single holmium atoms on a highly conductive metallic substrate can reach lifetimes of the order of minutes. Expand
In-Situ Manipulation of the Magnetic Anisotropy of Single Mn Atom via Molecular Ligands.
TLDR
It is revealed that the enhanced magnetic anisotropy of Mn arising from the carbonitrile ligand provides a prototype for the engineering of the magnetism of quantum devices. Expand
Three-dimensional mapping of single-atom magnetic anisotropy.
TLDR
This experiment demonstrates the feasibility of fully mapping the vector magnetic properties of individual spins and characterizing complex three-dimensional magnetic systems. Expand
Magnetic excitations of rare earth atoms and clusters on metallic surfaces.
TLDR
It is argued that the observed features of giant magnetic anisotropies and lifetimes of the excited states of Gd are caused by strongly localized character of 4f electrons in Gd atoms and clusters. Expand
Search for giant magnetic anisotropy in transition-metal dimers on defected hexagonal boron nitride sheet.
TLDR
Ir-Ir@Dh-BN is found to have both large MAE (∼126 meV) and high structural stability against dissociation and diffusion, and it hence can serve as magnetic unit in spintronics and quantum computing devices. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 20 REFERENCES
Magnetism from the Atom to the Bulk in Iron, Cobalt, and Nickel Clusters
Molecular beam deflection measurements of small iron, cobalt, and nickel clusters show how magnetism develops as the cluster size is increased from several tens to several hundreds of atoms forExpand
Direct determination of interfacial magnetic moments with a magnetic phase transition in Co nanoclusters on Au(111).
TLDR
The field- and temperature-dependent MCXD evidences a ferromagnetic(FM)-to-superparamagnetic phase transition in single-domain clusters with decreasing size, and the interfacial moments are remarkably enhanced as compared with bulk values, verifying theoretical predictions. Expand
Tight-binding approach to the orbital magnetic moment and magnetocrystalline anisotropy of transition-metal monolayers.
  • Bruno
  • Physics, Medicine
  • Physical review. B, Condensed matter
  • 1989
TLDR
A perturbative theory of magnetocrystalline anisotropy and orbital moment in itinerant ferromagnets is presented and it is shown that it may produce an an isotropy in the magnetization of the order of 0.1\ensuremath{\mu}B per atom. Expand
Exploring the microscopic origin of magnetic anisotropies with X-ray magnetic circular dichroism (XMCD) spectroscopy
Symmetry breaking and bonding at interfaces leads to a variety of anisotropy phenomena in transition metal sandwiches and multilayers. The charge density, the spin density and the orbital momentExpand
Localized magnetic states of Fe, Co, and Ni impurities on alkali metal films.
TLDR
The results show that the high magnetic moments of transition metals in alkali hosts originate from electron localization. Expand
Origin of orbital magnetization and magnetocrystalline anisotropy in TX ordered alloys (where T=Fe,Co and X=Pd,Pt).
TLDR
A method based on a perturbative treatment of the spin-orbit interaction and a Green's function technique in real space allows to interpret the magnetocrystalline anisotropy energy (MAE) in terms of interatomic interactions in the crystal. Expand
Ferromagnetism in one-dimensional monatomic metal chains
TLDR
Evidence is found that the monatomic chains consist of thermally fluctuating segments of ferromagnetically coupled atoms which, below a threshold temperature, evolve into a ferromagnetic long-range-ordered state owing to the presence of anisotropy barriers. Expand
Experimental confirmation of the X-ray magnetic circular dichroism sum rules for iron and cobalt.
  • Chen, Idzerda, +6 authors Sette
  • Materials Science, Medicine
  • Physical review letters
  • 1995
TLDR
The magnetic moments determined from the integrals of these spectra are found to be in excellent agreement (within 3%) for the orbital to spin moment ratios, and in good agreement for the individual moments, with those obtained from Einstein--de Haas gyromagnetic ratio measurements. Expand
Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices
TLDR
Thermal annealing converts the internal particle structure from a chemically disordered face- centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies that can support high-density magnetization reversal transitions. Expand
...
1
2
...