Resonance Magnetoelectric Effect Research Articles

Resonance Magnetoelectric Effect in Multilayer Composites

The phenomenological theory is presented on the influence of external electric field on the shift of resonance magnetic field, magnetic and magnetoelectric (ME) susceptibilities of composites. The shift of resonance magnetic field is proportional to linear and bilinear ME constants. The concentration and electric field dependencies of magnetic resonance field shift for layered nickel ferrite, lithium ferrite and yttrium iron garnet with ferroelectric lead zirconate titanate are calculated. Three measurement methods of ME susceptibility using resonant ME connection, electrical dipole transitions and resonant ME effect are proposed. The method of electrical dipole transitions is investigated in detail. Expressions for linear and bilinear ME susceptibility of the composite (symmetry point group 3 m or 4 mm) at high frequencies are found. The results of ME susceptibility measurement are useful for the analysis of electrically controlled high frequency devices of magnetic type, such as phase shifters, attenuators, and filters.

The Theory of Resonance Magnetoelectric Effect in Cr 2 O 3 on the Basis of the One-Ion Model

The microscopical theory of the resonance magnetoelectric effect in crystal Cr 2 O 3 is presented. The change of anisotropy constant under the action of external electric field has been calculated by methods of the perturbation theory. This change leads to the shift of the resonance lines. The temperature dependence of the resonance ME-effect has been investigated.

Microscopic mechanism of magnetoelectric effect in microwave range

It is presented the microscopical theory of the resonance magnetoelectric effect in magnetically ordered crystals. On the basic of the single-ion approximation is shown that the exchange interaction can be represented by a Weiss molecular field, it is possible to derive expression for the anisotropy constant. It is shown that the common operation of spin-orbit interaction, odd part of crystalline electrical field and external electrical field give an additional contribution to free energy, which is possible to interprete as change of anisotropy constant under action of the electrical field. This change leads to shift of the resonance lines. The ordered of magnitude of this effect, stipulated by this mechanism, will be rather well agreed with experiment.

A New type of resonant magnetoelectric effect of spin-flip tunneling nature and maser with tunneling pumping as methods of quantum paraelectric state studies

Abstract A new type of resonant magnetoelectric effect of spin-flip tunneling nature and maser with tunneling pumping are considered as methods of coherent quantum paraelectric state (CQPS) investigation in incipient ferroelectrics. It is shown that this effect is very sensitive to static and slow dynamic fluctuations of internal fields and thus may be informative in CQPS study. The possible origin of CQPS is considered on the basis of first order local configurational instability of definite matrix ions with creation of new excited tunnel states and percolation of the tunnel excitation. The probable role of tunneling in CQPS makes the study of such magnetoelectric effect important.