Spin reorientation and the magnetocaloric effect in HoyEr(1−y)N

Abstract

We report on the magnetic and magnetocaloric effect calculations in rare earth mononitrides Ho y Er (1Ày) N (y ¼ 0, 0.5, 0.75, and 1). The magnetic Hamiltonian includes the crystalline electrical field in both magnetic sublattices; disorder in exchange interactions among Ho-Ho, Er-Er, and Ho-Er magnetic ions and the Zeeman effect. The theoretical results for the magnetic entropy change and adiabatic temperature change are in good agreement with the available experimental data. Besides, ferrimagnetic arrangement, inverse magnetocaloric effect, and spin reorientation transition (spin flop process) were predicted and quantitatively described. V C 2012 American Institute of Physics.

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 contrast, no such anomalous behavior of − S M is observed in x = 0 sample around 70 K [27]. Although, a significant change in − S M value near the T SR has been predicted theoretically for single-crystalline samples [68], we do not observe such large changes in − S M for polycrystalline x = 0.4 sample. As single-crystalline materials provide highly preferred crystallographic orientation, they also exhibit anisotropic behavior in the magnetocaloric effect.…”

“…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.…”

Low-Temperature Crystal Structure and Mean-Field Modeling of ErxDy1−xAl2 Intermetallics

“…It is known that magnetic exchange between the localized, spatially separated 4f orbitals is mediated by the conduction electrons (Ruderman-Kittel-Kasuya-Yosida, RKKY-type interactions) [7][8][9][10]. In magnetic lanthanides with a non-zero orbital quantum number, L, the presence of spin-orbit coupling and site-dependent crystalline electric fields lead to the splitting of the 4f energy levels and their population by electrons creating unusually complex magnetic structures [10][11][12][13][14]. Further, the intimate coupling between magnetic and crystallographic sublattices often translates the magnetic complexity into crystallographic one (and vice versa) leading to a variety of magnetostructural phenomena [15][16][17].…”