Ferrimagnetic Resonance in Manganese Acetate Tetrahydrate

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Abstract
The electron paramagnetic resonance spectrum of Mn(C2H3O2)2·4H2O below the transition temperature at 3.2°K has been interpreted by use of the ferrimagnetic resonance equations developed by Smit and Beljers. The equations, suitably modified to include rhombic anisotropy, represent accurately the experimental results at high fields but deviate systematically from the data at low fields where multidomain structure is presumably important. The experiments were performed at a number of frequencies between 5 Mc/sec and 11.5 kMc/sec using rf and microwave techniques. The theory agrees well with the early data of Abe who used a less satisfactory theoretical model.