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- Garcia-Palacios, JL, et al.
(författare)
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Nonlinear susceptibility of superparamagnets with a general anisotropy energy
- 2000
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Ingår i: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 1098-0121. ; 61:10, s. 6726-6733
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Tidskriftsartikel (refereegranskat)abstract
- The equilibrium nonlinear response of noninteracting superparamagnets with a general single-spin anisotropy is investigated. Generalizing the results obtained for the simplest uniaxial anisotropy [Garcia-Palacios and Lazaro, Phys. Rev. B 55, 1006 (1997)],
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- Jonsson, P, et al.
(författare)
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Nonlinear dynamic susceptibilities of interacting and noninteracting magnetic nanoparticles
- 2000
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Ingår i: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - : ELSEVIER SCIENCE BV. - 0304-8853. ; 222:1-2, s. 219-226
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Tidskriftsartikel (refereegranskat)abstract
- The linear and cubic dynamic susceptibilities of solid dispersions of nanosized maghemite gamma -Fe2O3 particles have been measured for three samples with a volume concentration of magnetic particles ranging from 0.3% to 17%, in order to study the effect
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- Jonsson, PE, et al.
(författare)
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Relaxation time of weakly interacting superparamagnets
- 2001
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Ingår i: EUROPHYSICS LETTERS. - 0295-5075. ; 55:3, s. 418-424
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Tidskriftsartikel (refereegranskat)abstract
- The relaxation time of weakly interacting classical spins is calculated by introducing the averages of he local dipolar field, obtained by thermodynamic perturbation theory, in a rigorous expression for the single-spin thermoactivation rate in a weak but
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- Jonsson, PE, et al.
(författare)
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Thermodynamic perturbation theory for dipolar superparamagnets - art. no. 174416
- 2001
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Ingår i: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 6417:17, s. 4416-
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Tidskriftsartikel (refereegranskat)abstract
- Thermodynamic perturbation theory is employed to derive analytical expressions for the equilibrium linear susceptibility and specific heat of lattices of anisotropic classical spins weakly coupled by the dipole-dipole interaction. The calculation is carri
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