Magnetic exchange enhancement of electron spin resonance

摘要

Boltzmann probability theory applied to ferromagnets is adjusted to explain the coexistence of microwave and infrared exchange resonance. When paramagnetic systems become ferromagnetic, microwave resonance is greatly enhanced by the exchange energy. In a quantum mechanical analysis, an apparent paradox is revealed. The combination of Zeeman and exchange effects is modeled to produce approximate relations for the population of the magnetic ground state with the result that a reduced temperature of the spin system is denned. To illustrate these concepts, exchange-coupled 3d~1 single-pair and 3d~5 multi-spin pairs are examined.