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the possibility of the existence of a spin nematic state a strong magnetic field in a ferromagnetic substance, which exhibits large biquadratic exchange interaction and has a magnetic ion with spin S = 1, is investigated within the mean field approximation. The case of both isotropic and anisotropic ferromagnet beyond the Heisenberg model is studied. The transformation of the geometric projection of a spin nematic with respect to the magnetic field strength has been studied.
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Matyunina et al. (2024) studied this question.
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