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Magnetic exchange enhancement of electron spin resonance

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1 Author(s)
Dionne, Gerald F. ; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

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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 defined. To illustrate these concepts, exchange-coupled 3d1 single-pair and 3d5 multi-spin pairs are examined.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 7 )

Date of Publication:

Apr 2009

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