Lead-substituted barium hexaferrite for tunable terahertz optoelectronics

Abstract Due to their outstanding dielectric and magnetic properties, hexaferrites are attracting ever-increasing attention for developing electronic components of next-generation communication systems. The complex crystal structure the critical dependences electric properties on external factors, such as magnetic/electric fields, pressure, doping, open ample opportunities targeted tuning these when designing specific devices. Here we explored electromagnetic lead-substituted barium hexaferrite, Ba 1? x Pb Fe 12 O 19 , a compound featuring an extremely rich set physical phenomena that inherent in subsystems can have significant effect its response at terahertz frequencies. We performed first detailed measurements temperature-dependent (5–300 K) single-crystalline broad spectral range 1 Hz–240 THz. fully analyzed numerous with corresponding wide distribution energies affect material. most important fundamental finding is observation ferroelectric-like excitation unusual temperature behavior frequency strength. suggest microscopic models explain origin nonstandard evolution. Several narrower excitations associated transitions between fine-structure 2+ ground state. discovered radio-frequency relaxations attributed domains. Gigahertz resonances presumably magnetoelectric origin. obtained data diverse compounds provide information makes entire class attractive manufacturing devices range.