Abstract
The compound FeN clusters with cluster sizes of d=8–25 nm were synthesized using a plasma-gas-condensation (PGC) cluster deposition apparatus with changing the nitrogen gas flow rate R N 2 , and their crystal structures and magnetic properties were investigated. The fcc single-phase FeN clusters which have a tetrahedron shape are obtained, and their lattice parameter is a=0.428 nm, being close to that ( a=0.433 nm) of ZnS-type FeN films but clearly different from that ( a=0.457 nm) of NaCl-type FeN films. The magnetic measurement results indicate that the present ZnS-type FeN clusters are non-magnetic. The characteristic cusp at T f=8 K on the zero field cooling (ZFC) thermomagnetic curve is attributed to superparamagnetic behavior of Fe-oxide layer crystallites formed on the FeN cluster surfaces.
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