Dynamic magnetic response

Critical behaviours of sound propagation and dynamic magnetic response... 

Martin and Allen (1979). Nevertheless, it is, up to now, the only quantitative model including a gap which starts fix)m atomic numbers (Wachter 1987). Czycholl (1982) has also calculated the dynamic magnetic response of intermediate-valent SmBs including a hybridization gap. He obtained pronounced structures in the frequency dependence of the spin-spin correlation function, which can be understood by means of activation over the hybridization gap and should be observable in neutron scattering. 

The proposed approach unites the results of previous studies and is valid for a wide range of material parameters affecting the dynamic magnetooptical response of a magnetic fluid. The essential feature of the new model is that it is sensitive to the internal magnetic relaxation of single-domain particles. That points out a way to test those processes with the aid of standard birefringence... 

We assume in this separation that the spatial and temporal aspects of the fluctuations are independent. The term f Q) is the magnetic form factor and is related to the spatial extent of unpaired electrons. The form factor can be approximated as f Q) = jo) + Cx jj), where j ) are Bessel transforms of the single-electron density, U r), and Ci is a coefficient normally between 0 (for spin only systems) and 2. In most cases the form factor is a monotonically falling function with Q, although there are some important exceptions. For a fuller discussion and complete references, see Lander (1993). Due to the finite mass of the neutron, investigations at 0=0 are impossible. If we consider the electrons contributing to the dynamical susceptibility, which describes the temporal and spatial behavior of the magnetic response of a solid, x" Q, T)- then we frequently think... 

For isotropic phases, the dynamic magnetic field induced at nucleus I of a diamagnetic molecule by linear response to the a perturbing electric field is proportional to the imaginary contribution of the magnetoelectric shielding ... 

The practical goal of EPR is to measure a stationary or time-dependent EPR signal of the species under scrutiny and subsequently to detemiine magnetic interactions that govern the shape and dynamics of the EPR response of the spin system. The infomiation obtained from a thorough analysis of the EPR signal, however, may comprise not only the parameters enlisted in the previous chapter but also a wide range of other physical parameters, for example reaction rates or orientation order parameters. 

In view of this apparent contradictory outcome from the transport and magnetic properties, we were motivated to investigate the dynamics of the charge excitation spectrum by optical methods. In fact, the optical measurement is a powerful contactless experimental tool which should in principle allow to unfold the disagreement between and p(7 since the optical response of a metal... 

Other parameters which have been used to provide a measure of a include physical dimensions (thermomechanical analysis, TMA) [126], magnetic susceptibility [178,179], light emission [180,181], reflectance spectra (dynamic reflectance spectroscopy, DRS) [182] and dielectric properties (dynamic scanning dielectrometry, DSD) [183,184], For completeness, we may make passing reference here to the extreme instances of non-isothermal behaviour which occur during self-sustained burning (studied from responses [185] of a thermocouple within the reactant) and detonation. Such behaviour is, however, beyond the scope of the present review. 

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