@article{oai:nitech.repo.nii.ac.jp:00004754,
 author = {Yamamuro, S. and Sumiyama, Kenji and Kamiyama, T. and Suzuki, K.},
 issue = {10},
 journal = {JOURNAL OF APPLIED PHYSICS},
 month = {Nov},
 note = {Co-cluster-assembled films have been prepared using a size-controllable cluster beam deposition system, by which monodispersed Co clusters with a mean diameter, d = 6-13 nm are available. Their morphology and magnetic properties have been studied by scanning electron microscopy (SEM), small-angle x-ray scattering (SAXS) and magnetization measurements. The SEM images show that the film has a porous structure consisting of fine grains without a columnar texture and its density is about 25% of the bulk Co. The SAXS measurements indicate that monodispersivity of the incident clusters is maintained through their assembling process only for d = 13 nm. All the specimens exhibit ferromagnetic behavior at room temperature and the magnetic coercive field Hc rapidly increases with decreasing temperature: Hc = 168 kA/m (2.1 kOe) at 5 K. Such an enhancement in Hc is ascribed to the exchange anisotropy which arises from the antiferromagnetic Co-oxide layers covering the Co clusters, and to the assemblies of single-domain ferromagnetic clusters with the structure modification and magnetic interaction among them. The monotonic increase in Hc at 300 K with increasing d is simply understood in terms of the single-domain particle theory., application/pdf},
 pages = {5726--5732},
 title = {Morphological and magnetic characteristics of monodispersed Co-cluster assemblies},
 volume = {86},
 year = {1999}
}