Relaxation Effects in Ferromagnetic Resonance

Bloembergen, N.; Damon, R. W.

doi:10.1103/physrev.85.699

Cited by 102 publications

(38 citation statements)

References 5 publications

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“…This causes additional attenuation of the uniform precession seen as resonance line broadening. It must be noted that in our case the threshold of nonlinear effects is very low (lower then 1 mW) in contrast to well known case of ferrites [9] The threshold field is [10]. It can be concluded that the observed additional absorption is caused by the parametric excitation of both short-and long-wavelength spin waves corresponding to the sizes of the available inhomogeneities.…”

Section: Resultsmentioning

confidence: 52%

“…The nonlinear phenomena in ferrimagnets are caused by some instability making the oscillation amplitudes increase with time. This was detected for the first time in experiments on ferrimagnetic resonance in nickel ferrite in large amplitude (about 1 kW) pumping fields [9]. The instability related phenomena (auto-oscillations, parametric excitation, autoparametric processes, etc.)…”

Section: Resultsmentioning

confidence: 92%

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Microwave absorption in the frustrated ferrimagnet Cu2OSeO3

Kobets

Dergachev

Khatsko

et al. 2010

Low Temperature Physics

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The resonance properties of a new Cu 2 OSeO 3 ferrimagnet have been investigated in a wide range of frequencies (17-142 GHz) at liquid helium temperature. The resonance data were used to plot the frequencyfield dependence of the ferrimagnetic spectrum described within the model of an anisotropic two-sublattice ferrimagnet. The effective magnetic anisotropy corresponding to the gap in the spin wave spectrum has been estimated (3 GHz). It is found that the spectrum has a multicomponent structure which is due to the diversity of the types of magnetization precession. As the amplitude of the high-frequency magnetic field increased, an additional absorption was observed in the external magnetic field lower than the field of the main resonance. The detected additional absorption corresponds to the nonuniform nonlinear parametric resonance, connected with nonuniformity of magnetic structure in the ferrimagnetic crystal Cu 2 OSeO 3 .

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 92%

Microwave absorption in the frustrated ferrimagnet Cu2OSeO3

Kobets

Dergachev

Khatsko

et al. 2010

Low Temperature Physics

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“…Subsequently there have been many applications to electron spins. Bloembergen and Wang (1954) measured the change in the z magnetization following a microwave pulse by using a pickup coil outside the resonant cavity. They mentioned, but did not apply, a technique in which recovery would be monitored in a low-level microwave field after the end of the saturating microwave pulse.…”

Section: 21mentioning

confidence: 99%

Relaxation Times of Organic Radicals and Transition Metal Ions

Eaton

2002

Biological Magnetic Resonance

155

165

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Abstract:Review of electron spin relaxation times for organic radicals and transition metal ions in magnetically dilute samples. Emphasis is placed on studies that have been performed as a function of temperature and that provide insight into the relaxation processes. INTRODUCTION Scope of this ChapterMost of the methods for determining distances between spins (ch.l) are either experimentally feasible or theoretically applicable for a limited range of electron spin relaxation times. For example, analysis of the dipolar contribution to the CW line shape to determine interspin distance requires that the relaxation rate for the interacting partner is slow enough that the dipolar splitting is not collapsed by electron spin relaxation. In addition, analysis of the line shapes assumes that spectra are obtained under nonsaturating conditions and are free from passage effects. Application of methods based on changes in relaxation times requires that the relaxation rate of the interacting partner fall within certain limits. The longest distance that can be obtained by pulsed techniques is limited, in principle, by the relaxation-determined width of an individual spin packet. Thus, knowledge of electron spin relaxation times is foundational to the methodologies presented in this book.

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“…Calibration of the frequency response of the detection apparatus was performed using a solid DPPH (1-1-diphenyl-2-picrylhydrazyl, Sigma-Aldrich Co. Ltd.) sample, whose ESR relaxation times are known to be T 1e = T 2e = 67 ns (43). T 1e and T 2e were then calculated by fitting the experimental data to the theoretical lines with Mathcad, by means of the iterative Levenberg-Marquardt algorithm (44).…”

Section: Figmentioning

confidence: 99%