Effect of magnetic field on stability and excitation spectrum of spin nanoclusters in anisotropic ferromagnetic chains

The spectral problem of the internal mode oscillations of a spin nanocluster in an anisotropic ferromagnetic chain placed in a magnetic field has been solved exactly within the framework of the discrete Takeno–Homma model. A stability diagram on the plane of parameters of the exchange and the magnetic field is constructed for spin clusters of arbitrary sizes. Explicit expressions for the internal mode oscillations of nanoclusters are found and the frequency dependences on parameters of the exchange and the magnetic field are calculated.

Key words: ferromagnetic chain, spin cluster, magnetic field, stability, internal modes, Takeno–Homma equation.

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