In terms of the size-dependent second-order Curie temperature model originally proposed for spherical nanoparticles, we develop an analytical model to describe size dependence of magnetostructural transition temperature T_t(D,L) in MnBi cylindrical nanorods through considering the effects of both diameter D and length L. It is found that the size-dependent magnetostructural transition temperature decreases with declining diameter and length where the diameter effect is the principle factor while the length effect is the secondary one. Moreover, the size dependence of T_t(D,L) of nanorods is weaker than that of zero-dimensional spherical nanoparticles while is stronger than that of one-dimensional cylindrical nanowires. The accuracy of the developed model is verified by the available experimental results.
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