Abstract
Electron spin resonance (ESR) experiments using a far infrared laser and a superconducting magnet have been performed on a single crystal sample of the metamagnet FeCl2. A new ESR signal has been observed at a much higher frequency than the ordinary antiferromagnetic and ferromagnetic resonance frequencies. The new ESR signal originates from a transition within the lowest triplet state of single Fe2+ ions in the presence of exchange fields.
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