Effect of spin reorientation on magnetocaloric and transport properties of NdAl2

Abstract

Cite this article as: M.V. de Souza, J.A. da Silva and L.S. Silva, Effect of spin reorientation on magnetocaloric and transport properties of NdAl 2 , Journal of Magnetism and Magnetic Materials, http://dx.We report the magneto-thermal and resistive properties of rare-earth dialuminide NdAl 2 , including spin reorientation transition. To this purpose, we used a theoretical model that considers the interactions of exchange and Zeeman, besides the anisotropy due to the electrical crystal field. The theoretical results obtained were compared to experimental data of the NdAl 2 in single crystal and bulk forms. Explicitly, we have calculated the anisotropic variation of magnetic entropy with the magnetic field oriented along the three principal crystallographic directions: [100], [110], and [111] of NdAl 2 single crystal, where a signature of the spin reorientation is observed in the [110] and [111] directions. Moreover, of magnetoresistivity we consider the applied magnetic field along the crystallographic directions [100] and [110]. In turn, for the polycrystalline form, the good agreement between theory and experiment confirms the presence of spin reorientation, which was predicted theoretically in magnetization curves.

Low-field magnetocaloric effect in Nd2Ni2ln intermetallic compound / Efeito magnetocalórico de baixo campo no composto intermetálico Nd2Ni2ln

“…( 5), whereas the SM theoretical was obtained with the parameters list in Table 1. The shape of the curves is in accordance with the theoretical results of an antiferromagnetic compound reported by [2,6].…”

“…The shape of the curves is in accordance with the theoretical results of an ferromagnetic material as reported in refs. [2,6].…”

“…This effect is more evident around the critical temperature because in this region the magnetization changes faster and consequently there is a greater variation of entropy. In anisotropic materials, the change in the direction of the applied field promotes MCE variation [2,3] This compound crystallizes in the Mo2FeB2 tetragonal structure (P4/mbm space group) [5].…”

Unveiling ferrimagnetic ground state, anomalous behavior of the exchange-bias field around spin reorientation, and magnetoelectric coupling in YbCr1−xFexDalal1, Sarkar2, Rayaprol3 et al. 2020Phys. Rev. B19140View full textAdd to dashboardCite

“…In general, any kind of first-order magnetic phase transition is associated with the corresponding isothermal magnetic entropy change ( S M ), which gives rise to the significant magnetocaloric effect (MCE) in the material [66][67][68][69]. Thus, the first-order SR phenomenon in x = 0.3−0.6 samples encouraged us to study the MCE through isothermal magnetization measurements.…”