Calculation of the Magnetomotive Force of Control Coils of Actuators with Different Current Directions

The article is devoted to solving the actual problem of synthesis of actuators based on materials with a form memory effect. An actuating device with a distributed control coil and an active element made of such ma-terial is considered. It is shown that the characteristics of the device do not depend on the direction of the mag-netic field providing deformation. Not only the magnitude of the magnetizing force but also the direction of current in the windings of the distributed control coil has a significant influence on the process of re-magnetizing the active element. It is advisable to use alternating current direction in control coils of actuators to save electric energy

Proximity Effect for Asymmetrical Three-Layered FS Structures in External Magnetic Field

We study asymmetrical three-layers F1F2S and F1SF2 structures in an external parallelmag-netic field. Assuming that all F and S layers are dirty, we solve the boundary value problem for theUsadel function. We calculate the critical temperature of in the F1F2S and F1SF2 systems as functionof the F layers thicknesses and external magnetic field.

Influence of Glass Coating Thickness on Magnetoimpedance Ratio in Co-Based Amorphous Microwires

The effect of glass coating thickness on the magnetoimpedance in Co-based amorphous microwires was studied. The microwires with different thickness of the glass layer were obtained by means of etching in hydrofluoric acid solution. It was observed that the value of the external mag¬netic field corresponding to the maximum of the impedance decreased with the thickness of the glass layer, whereas the magnetoimpedance ratio did not change significantly. The experimental results are interpreted in terms of changes in the radial distribution of the easy magnetization axes.

NONLINEAR FREQUENCY SUPERPOSITION FOR ROTATING FRAMES

In the slowly varying magnitude approximation Maxwell’s equation describing light propagation in some electro-optical crystals under the action of an external electrical field, is equivalent to Pauli’s equation describing motion of particles with spin [Formula: see text] in a mag-netic field. Use of this analogy for measuring the deviation from the linear frequency superposition by transition to rotating frame is discussed. Some group theory aspects of nonlinear law are considered.