1962
DOI: 10.1103/physrev.128.2078
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Ferromagnetic Resonance of Single-Domain Particles

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Cited by 86 publications
(48 citation statements)
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“…For K, or better for the absolute value of the anisotropy constant, we obtained the range K ≈ 2.4 × 10 4 -3.6 × 10 5 J/m 3 . These estimates of K compare surprisingly well with the magnitude of the first constant of magnetocrystalline anisotropy of bulk cubic maghemite which is equal to −2.5 × 10 4 J/m 3 [9]. This points to the conclusion that the energy barrier determining the time of relaxation of our magnetic particles to equilibrium is, beside their volumes, mostly governed by the magnetocrystalline anisotropy.…”
Section: Estimate Of the Energy Barriersupporting
confidence: 71%
“…For K, or better for the absolute value of the anisotropy constant, we obtained the range K ≈ 2.4 × 10 4 -3.6 × 10 5 J/m 3 . These estimates of K compare surprisingly well with the magnitude of the first constant of magnetocrystalline anisotropy of bulk cubic maghemite which is equal to −2.5 × 10 4 J/m 3 [9]. This points to the conclusion that the energy barrier determining the time of relaxation of our magnetic particles to equilibrium is, beside their volumes, mostly governed by the magnetocrystalline anisotropy.…”
Section: Estimate Of the Energy Barriersupporting
confidence: 71%
“…For cubic c-Fe 2 O 3 with negative anisotropy constant K, the numerical calculations of Valstyn et al predict four different resonance lines for nearly spherical samples and two lines for ellipsoidal samples with a/b > 1.30 [25]. For bulk samples only a single line has always been observed.…”
Section: Resultsmentioning
confidence: 99%
“…According to Valstyn et al [14], and more recently Dutta et al [29], in the case of elongated ferro-or ferri magnetic nanoparticles, a double line is expected in the FMR spectrum. As temperature decreases, the line appearing at lower field would separate from the one at high field, which would remain at a constant resonance field.…”
Section: Interpretation Of Fmr Spectramentioning
confidence: 91%
“…Since the shape-dependent equation for single crystals derived by Kittel [12,13], subsequent attempts of explaining the FMR spectra from a theoretical point of view, treating single domain particles and including only the size and shape distribution of particles revealed a visible disagreement when an external magnetic field was applied during experiments [14]. Precisely, further models [15][16][17] which have taken into account the size distribution, dipolar and exchange interactions and thermofluctuational perturbations in the superparamagnetic regime, have resulted in better approaches to the intrinsic lineshape and resonance fields.…”
Section: Introductionmentioning
confidence: 99%