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A first-order magnetic phase transition, accompanied by a decrease in magnetization and coercive force, occurs in nanoparticles that are diluted with superstrong magnets ε-In0.043Fe1.957O3 at a temperature of T = 150 K. The phase transition consists of a re-orientation of the easy magnetization axis due to the competition between the single-ion and dipole-dipole magnetic anisotropies. Temperature hysteresis of magnetization is observed near the temperature of the spin-reorientation transition, which is explained by the delay in the new phase growth with the change of the direction of the easy axis. The jump in magnetization, caused by the spin-reorientation transition, is suppressed with increasing magnetic field.
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Dmitriev et al. (2015) studied this question.
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