Analysis of electromagnetic propagation in the magnetic plasma state in spin-ice systems

Abstract

Low energy excitation states in magnetic structures of the so-called spin-ices are produced via spin flips among contiguous tetrahedrons of their crystal structure. When there are sufficient free positive and negative charges, the system behaves as a magnetic plasma, which could correspond to the highest temperature peak of the specific heat. The electromagnetic waves in both unconfined and confined systems (waveguides) filled with materials of magnetic charges can be able to transmit information and energy. The only problem is the low temperature for which these magnetic entities appear in the spin-ice materials. However, similar behaviour may be present in other compounds at higher temperatures. This analysis is addressed to study physical properties which should be present in those new materials. Therefore, in this paper, we obtain some magnetic linear responses, the effective masses of the magnetic charges from the precession movement of the monopoles which coincides with a strong electromagnetic absorption frequency, the plasmonic physical magnitude which is identified with the cut propagation frequency in a wave guide, and other properties of the electromagnetic propagation in these compounds with effective magnetic monopoles such as the modification of the electromagnetic fields of the wave in the presence of magnetic charges and currents. All these electromagnetic properties can serve as tests for detecting magnetic entities which mimic the behaviour of magnetic monopoles in other different new materials. Besides, these analyses can be illuminating for obtaining possible circuital applications of these materials that lead to “Magnetronic” devices.