2004
DOI: 10.1063/1.1759073
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Magnetic properties of metallic ferromagnetic nanoparticle composites

Abstract: Magnetic properties of nanoparticle composites, consisting of aligned ferromagnetic nanoparticles embedded in a nonmagnetic matrix, have been determined using a model based on phenomenological approaches. Input materials parameters for this model include the saturation magnetization (M s ), the crystal anisotropy field (H k ), a damping parameter ͑␣͒ that describes the magnetic losses in the particles, and the conductivity ͑͒ of the particles; all particles are assumed to have identical properties. Control of … Show more

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Cited by 152 publications
(80 citation statements)
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“…Eddy current losses are also possible, but should be a small contribution for particles in the 10 nm size range as determined by R. Ramprasad et. al [8]. In practice, probably both mechanisms contribute, but no overall model currently exists.…”
Section: Introductionmentioning
confidence: 99%
“…Eddy current losses are also possible, but should be a small contribution for particles in the 10 nm size range as determined by R. Ramprasad et. al [8]. In practice, probably both mechanisms contribute, but no overall model currently exists.…”
Section: Introductionmentioning
confidence: 99%
“…Then a chain of spheres will behave close to a cylinder (its outer volume) and the entire chain has a uniaxial anisotropy whose origin is the interparticle interaction field, 32 while the same particles forming an spherical assembly will be isotropic. Although this is a well known result, it shows that this effect follows from the key role played by the outer demagnetizing factor on the value of the interaction field, which recently has been related to novel effects in granular hard magnets, 42 composites, 43 and dipolar ferromagnetic order in superparamagnetic particle monolayers. 44 Another effect related to this contribution is the magnetization reorientation transition induced by the interaction field, which was discussed for the linear chain of cylinders, but which has also been reported for other assemblies.…”
Section: 39mentioning
confidence: 95%
“…Therefore, the edgy current losses are possibly nonnegligible and they may also contribute to the distortion in the shape of P͑H͒. 14 The linewidth ⌬H is the measure of the rate at which the energy is transferred from the precessing magnetic moments of the sample to its lattice. A rapid transfer results in a strong damping of the precessional motion, and accordingly short relaxation times, which broadens the spectral line overall.…”
Section: B Dynamic Magnetic Propertiesmentioning
confidence: 99%