Giant Magnetic Anisotropy of Single Cobalt Atoms and Nanoparticles
Forschungszentrum Jülich · AREA Science Park · +4 more institutions
Abstract
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, the magnetic anisotropy energy is further shown to be dependent on single-atom coordination changes. These results confirm theoretical predictions and are of fundamental value to understanding how magnetic anisotropy…
Citation impact
- FWCI
- 39.25
- Percentile
- 100%
- References
- 23
Authors
12- PGPietro GambardellaCorresponding
Forschungszentrum Jülich, AREA Science Park, European Synchrotron Radiation Facility, Max Planck Institute for Solid State Research, Institute of Structure of Matter, École Polytechnique Fédérale de Lausanne
- SRS. Rusponi
Forschungszentrum Jülich, AREA Science Park, European Synchrotron Radiation Facility, Max Planck Institute for Solid State Research, Institute of Structure of Matter, École Polytechnique Fédérale de Lausanne
- MVM. Veronese
Forschungszentrum Jülich, AREA Science Park, European Synchrotron Radiation Facility, Max Planck Institute for Solid State Research, Institute of Structure of Matter, École Polytechnique Fédérale de Lausanne
- SSS. S. DhesiCorresponding
Forschungszentrum Jülich, AREA Science Park, European Synchrotron Radiation Facility, Max Planck Institute for Solid State Research, Institute of Structure of Matter, École Polytechnique Fédérale de Lausanne
- CGCesare Grazioli
Forschungszentrum Jülich, AREA Science Park, European Synchrotron Radiation Facility, Max Planck Institute for Solid State Research, Institute of Structure of Matter, École Polytechnique Fédérale de Lausanne
Topics & keywords
- Magnetic anisotropy
- Magnetic moment
- Anisotropy energy
- Anisotropy
- Cobalt
- Atom (system on chip)
- Condensed matter physics
- Superparamagnetism