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Abstract
Two new types of magnetic resonances in ferro- and antiferromagnetic Ising-like spin system are reported. One of them is the spin-cluster resonance first observed in CoCl22H2O. This compound is antiferromagnetic below 17°K with an antiferromagnetic arrangement of ferromagnetic Ising-like linear chains. In such a system, one can expect localized spin-cluster excitations in addition to the usual spin waves. We have observed the resonance with the selection rule Δm = ±1, where m is the number of spins in a short-range-order spin cluster directed opposite to the majority spins in a ferromagnetic chain of CoCl22H2O. In FeCl2, the spin-cluster resonance in a ferromagnetic layer was observed. When an Ising-like spin system contains some impurity spins, the impurity spin resonance can be observed under suitable conditions. We have observed the spin resonance of Fe3+ and Mn2+ spins in FeCl2. A more typical example was obtained in Mn-doped CoCl22H2O whose resonance line shows a well-separated fine structure splitting.
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