Abstract
The influence of magnetocrystalline anisotropy (K) on the magnetic entropy change (ΔSM) in single crystals under low fields (H) is studied based on unbiased Monte Carlo simulations. When H is applied perpendicular to the easy axis, the positive and negative ΔSM may coexist. The positive ΔSM peak value and its maximum value optimized by the field and the threshold of switching to negative ΔSM depend on K. Moreover, K linearly enhances the blocking temperature where the negative ΔSM maximum is obtained, associated with the decrease in the peak value with increasing K. Finally, the rotating ΔSM under a constant H may be much larger than ΔSM produced by moving the model in and out of the same H, and the best response to K is found at 86° between K and H, independent of the anisotropy magnitude.
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