Magnetocaloric effect in rare-earth intermetallics: Recent trends

Abstract

Magnetocaloric effect (MCE) is the change in isothermal magnetic entropy ( S m ) and adiabatic temperature ( T ad ) that accompany magnetic transitions in materials during the application or the removal of magnetic field under adiabatic conditions. The physics of MCE gets enriched by correlated spin-lattice degrees of freedom. This phenomenon has been actively investigated over the past few decades as it holds a promise for an alternate method of refrigeration/heat pumping. This has already resulted in several reviews on this topic. This paper focusses on some recent trends in this field and prospects of using rare-earth-based materials as active magnetic refrigerants over a broad temperature range that includes gas liquefaction and near-room temperature refrigeration/heating.

Magnetocaloric effect in amorphous-crystalline microcircuits PrDyFeCoB

“…In the field of rare-earth alloys Re−T M−B (Rerare-earth metals, T Mtransition metals, Bboron) a considerable amount of research on the magnetocaloric effect has been done on bulk samples [13][14][15][16][17][18][19][20][21][22][23][24][25]. Studies of micro-magnets exhibiting MCE are not so widely presented in the literature.…”

“…Note that the RCP value in Pr 1.3 Nd 0.7 Fe 17 is comparable in value to the data of our experiments, which is explained by the significant width of the entropy peak in the alloys we study. Magnetocaloric parameters of rare-earth alloys (Curie temperature T c , maximum change in the magnetic component of entropy − S max , RCP) are collected in the Table according to data [13][14][15][16][17][18][19][20][21][22][23][24][25]. It follows from the data presented that the phase transition temperatures investigated in our and other works are close to room temperature.…”

“…The decrease in the blocking temperature with increasing measuring magnetic field in such experiments is explained by the slope of the potential relief formed by the magnetic anisotropy profile summarized with the Zeeman energy of the nanoparticle. The effective height of the barrier separating the opposite directions of nanoparticle magnetization decreases as the Zeeman energy [19] increases. The blocking temperature depends on the field according to the formula…”

“…Magnetocaloric parameters of rare-earth alloys (Curie temperature Tc , maximum change in the magnetic component of entropy − Smax, RCP) by data[13][14][15][16][17][18][19][20][21][22][23][24][25] …”

Recent Progress in Crystallographic Characterization, Magnetoresponsive and Elastocaloric Effects of Ni-Mn-In-Based Heusler Alloys—A Review

“…This value of ΔS M is comparable to the famous room-temperature rare-earth-based MCE refrigerant, such as Gd 5 Si 2 Ge 2 , MnAsSb, and La(Fe, Si)13. Besides, since the critical temperature of first-order martensitic transformation can be easily tailored by composition modification, the NiMnInbased alloy has adjustable refrigeration working temperature, as well as relatively low cost, compared with the second-order Cuire transition associated rare-earth-based MCE materials, such as Gd, RAl 2 (R = Er, Ho, Dy, Dy 0.5 Ho 0.5 , Dy x Er 1−x , Gd and Pd), RE-TM (RE = Nd, Ho, Er, and Tm; TM = Zn and Ga) and RETMX (RE = Tb, Dy, Ho, and Er; TM = Fe, Co, and Pt; X = Al, Mg, and C) (Luo and Wang, 2009;Nirmala et al, 2015;Li and Yan, 2020). Moreover, different from the conventional MCE refrigerants in which the temperature is increased upon the application of magnetic field, the temperature of the NiMnIn-based alloys is decreased when a magnetic field is applied.…”