From the Co Nanocrystals to Their Self-Organizations: Towards Ferromagnetism at Room Temperature

• Authors: I. Lisiecki
• Languages of publication: EN

Abstracts

EN

Here, we show that rather uniform 7 nm Co nanocrystals self-organize into long-range two- and three-dimensional superlattices. Due to this ability we have to control the mesoscopic ordering; unexpected intrinsic collective chemical and physical properties have been discovered. By annealing treatment, a crystallographic transition from a polycrystalline fcc- to single crystalline hcp-Co phase is obtained leading to a drastic change in the magnetic properties such as an increase in the blocking temperature that can reach a value close to room temperature. Neither coalescence between nanocrystals nor oxidation of the Co material is observed. In these artificial solids, when the individual nanocrystal anisotropy is low, super-spin glass behavior is observed.

Keywords

EN

75.50.Tt; 75.70.Cn

Discipline

• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 75.70.Cn: Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 426-433

Dates

published

2012-02

Contributors

author

I. Lisiecki

• Laboratoire LM2N, UMR CNRS 7070, Université P. et M. Curie, Bât F, 4 Pl. Jussieu, 75005 Paris, France

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Identifiers

DOI

10.12693/APhysPolA.121.426