Issue |
Europhys. Lett.
Volume 38, Number 3, April III 1997
|
|
---|---|---|
Page(s) | 195 - 200 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00225-3 | |
Published online | 01 September 2002 |
Observation of 4d ferromagnetism in free-standing Pd fine particles
1
Department of Materials Science, Faculty of Science and Technology Keio University - Yokohama 223, Japan
2
Department of Instrumentation Engineering, Faculty of Science and
Technology, Keio University - Yokohama 223, Japan
Received:
2
September
1996
Accepted:
14
March
1997
We report on observation of 4d ferromagnetic ordering in pure Pd fine
particles. Results of our dc magnetic measurements as a function of Pd particle
size show that the magnetization increases rapidly with decreasing particle
size; a sample with 59 Å median radius at 1.8 K under 4 kOe shows a
factor of nineteen larger magnetization than that of Pd bulk. We suggest that
only the surface monolayers of Pd particles are magnetic. The ferromagnetic moment we
deduced based on this assumption is per atom which
is comparable to the value predicted by the ab initio calculation.
PACS: 61.46.+w – Clusters, nanoparticles, and nanocrystalline materials / 75.30.Pd – Surface magnetism / 75.50.Tt – Fine-particle systems
© EDP Sciences, 1997
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