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A Resonance Study of Magnetic Interaction in Single-Particle Systems and Agglomerates

✍ Scribed by P.C. Morais; M.C.F.L. Lara; F.A. Tourinho

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
129 KB
Volume
121
Category
Article
ISSN
1064-1858

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✦ Synopsis

two related systems, magnetic single particles and magnetic Magnetic resonance is used in this work to investigate agglomerates, will also be presented. magnetic particle-particle interaction in magnetic single

Although magnetic particles are dispersed in a magnetic particles and magnetic agglomerates. Magnetic dipole-difluid as single entities, they may interact electrically and pole interaction between monodomain particles accounts for magnetically with one another, depending upon the characthe magnetic-resonance data in magnetic fluids. In magnetic teristics of the particular system under consideration. For agglomerates, however, an anisotropic interaction between magnetic resonance, an approximate calculation for the linespins in the agglomerate and spins in the magnetic monodowidth broadening, based on Van Vleck's method of momain dominates the magnetic-resonance behavior.

ments, is presented here (4). The method of moments takes A magnetic single-particle system is realized by magnetic into account the amount of spreading of the magnetic-resofluids where monodomain nanoscaled magnetic particles are nance line due to Zeeman, exchange, and dipolar interacdispersed in a carrier fluid. Magnetic agglomerates, meaning tions. Calculation of the resonance-linewidth broadening clusters of magnetic particles, are obtained after removal of starts with a Hamiltonian that describes a magnetic system the carrier fluid from a magnetic-fluid sample. For decades, composed of identical and regularly arranged magnetic cenintensive investigations have been performed in both magters in an external magnetic field (H e ) netic fluids and magnetic agglomerates (powder samples). However, little effort has been done to understand the relationship between the magnetic properties of magnetic fluids 70

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