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This paper investigates the structural evolution in a magnetic fluid microstrip under external magnetic fields parallel to the strip surface. It is shown that as the field strength increases, the structure evolves from an originally monodispersed state to a disordered magnetic chain state, and then to a one-dimensional ordered structure of chains. For the ordered structure state, the chain spacing is reduced with an increase in field strength, because more columns form under higher fields. Thus, a tunable one-dimensional ordered structure can be achieved in magnetic fluid films under parallel magnetic fields. The manipulations of the tunability of the ordered structure under various control parameters, such as the sweep rate of the magnetic field, the fluid concentration, and the strip width, are also discussed. [ABSTRACT FROM AUTHOR]

A theoretically revealed effect [Belov et al., Opt. Lett. 34, 527 (2009)] of the significant enhancement of evanescent harmonics inside a wire medium slab is experimentally verified in the microwave frequency range. The phenomenon originates from resonant pumping of standing waves into which evanescent waves are converted inside the slab. We find a good agreement between experimental data, numerical simulations and theory. [ABSTRACT FROM AUTHOR]

Analytic expressions for alternating current (ac) loss in radially arranged superconducting strips are presented. We adopt the weight-function approach to obtain the field distributions in the critical state model, and we have developed an analytic method to calculate hysteretic ac loss in superconducting strips for small-current amplitude. We present the dependence of the ac loss in radial strips upon the configuration of the strips and upon the number of strips. The results show that behavior of the ac loss of radial strips carrying bidirectional currents differs significantly from that carrying unidirectional currents. [ABSTRACT FROM AUTHOR]