Title :
Effect of particle size and surface chemistry on the interactions among fine metallic particles
Author :
Gangopadhyay, S. ; Hadjipanayis, G.C. ; Sorensen, C.M. ; Klabunde, K.J.
Author_Institution :
Delaware Univ., Newark, DE, USA
fDate :
11/1/1993 12:00:00 AM
Abstract :
The effect of different particle size (50-350 Å) and surface passivation on the magnetic behavior including interactions is studied and correlated in Fe and Co particles. The effect of packing fraction on the above properties is investigated. The DC remanence and ΔM curves are used to calculate various interaction parameters and quantify them, respectively. Strong exchange coupling at the core-shell interface (intra-particle interactions) has a higher contribution to the overall interactions than the interparticle dipolar interactions, especially in smaller particles
Keywords :
X-ray diffraction examination of materials; cobalt; electron diffraction examination of materials; ferromagnetic properties of substances; iron; magnetic properties of fine particles; particle size; passivation; remanence; transmission electron microscope examination of materials; 10 to 300 K; Co particles; Fe particles; core-shell interface; direct current remanence; exchange coupling; fine metallic particles; interaction parameters; interparticle dipolar interactions; magnetic behavior; packing fraction; particle size; surface chemistry; surface passivation; Astrochemistry; Chemistry; Iron; Magnetic cores; Magnetic properties; Passivation; Physics; Remanence; Saturation magnetization; Surface morphology;
Journal_Title :
Magnetics, IEEE Transactions on
