Anisotropic Magnetocaloric Effect Research Articles

Anisotropic magneto-resistivity and magnetocaloric effect in DyAl2

In this study, we experimentally and theoretically investigate the correlation between the anisotropic magnetic resistivity and magnetocaloric effect in DyAl2 single crystals. DyAl2 crystallizes in the C15 Laves phase structure with cubic symmetry. While some earlier studies revealed that the isothermal entropy change in dialuminides follows a similar trend as the electrical resistivity change as a function of temperature and magnetic field, the correlation between anisotropic behavior of these two physical parameters is yet to be explored to the best of our knowledge. To address this gap, we measured electrical resistivity of DyAl2 single crystals along two different directions in zero and applied magnetic fields and compared the experimental results with our theoretical model. For the theoretical analysis, we employed a model Hamiltonian in the mean-field approximation, considering the exchange interaction, Zeeman effect, and crystalline electric field associated with the cubic symmetry. Our findings reveal a significant dependence of DyAl2 resistivity on the direction of the applied magnetic field, in agreement with our theoretical results. These outcomes emphasize the interplay between magnetocaloric effect and magneto-resistivity, underscoring the potential of the magnetocaloric effect as a valuable tool for gaining deeper insights into basic physical properties including electron transport behavior.

Highly Anisotropic Magnetism and Nearly Isotropic Magnetocaloric Effect in Mn3Sn2 Single Crystals

Mn3Sn2 has been proposed as an ideal material for magnetic refrigeration. It undergoes two successive ferromagnetic transitions (T C1 = 262 K and T C2 = 227 K) and one antiferromagnetic transition (T N = 192 K). Herein we report, for the first time, the preparation of single crystals of Mn3Sn2 from Bi flux. The resultant anisotropic magnetic properties and magnetocaloric effect are investigated along the three principal crystallographic directions of the crystal. Significant anisotropy of magnetic susceptibility and multiple field-induced metamagnetic transitions were found at low fields, whereas the magnetocaloric effect was found to be almost isotropic and larger than that of the polycrystalline one. The maximum magnetic entropy change amounts to −ΔS M = 4.01 J⋅kg−1⋅K−1 near T C1 under a magnetic field change of μ 0ΔH = 5 T along the c-axis, with the corresponding refrigerant capacity of 1750 mJ⋅cm−3. Combined with a much wider cooling temperature span (∼ 80 K), our results demonstrate Mn3Sn2 single crystal to be an attractive candidate working material for active magnetic refrigeration at low temperatures.

Fathoming the anisotropic magnetoelasticity and magnetocaloric effect in GdNi

Intermetallic GdNi adopts a CrB type of crystal structure (space group $Cmcm$), and it orders ferromagnetically via a second-order phase transition at 70 K, exhibiting unusually strong spontaneous striction along the three independent crystallographic axes in the ferromagnetically ordered state. We introduce a microscopic model to describe anisotropic changes of lattice parameters and elastic contribution to magnetocaloric effect of GdNi. In the model, results of density functional theory (DFT) calculations are used as inputs into a Hamiltonian that includes elastic energy of an anisotropic crystal lattice, exchange interactions, and Zeeman effect. The magnetic and elastic Hamiltonians are coupled through an anisotropic Bean-Rodbell model of magnetoelastic interactions. This coupling gives rise to anisotropic changes in the lattice parameters observed experimentally, and the model reveals good to reasonable agreements between the current theoretical results and earlier experimental data, thus validating the model within the limits of assumptions made. We also show that DFT calculations with $4f$ electrons of Gd treated as core electrons lead to a more adequate estimate of elastic constants of GdNi in comparison with the $\mathrm{LDA}+U$ method where $4f$ electrons are treated as valence electrons.

Anisotropic magnetic property, magnetostriction, and giant magnetocaloric effect with plateau behavior in TbMn2Ge2 single crystal

The ternary RMn2Ge2 (R = rare earth) intermetallic compounds have attracted great attention due to their interesting magnetic behaviors and magnetotransport responses. Here, we reported our observation of anisotropic magnetic property, magnetostriction, and magnetocaloric effect (MCE) in TbMn2Ge2 single crystal. Below the transition temperature of Tb magnetic sublattices (T_{{text{C}}}^{{{text{Tb}}}} ~ 95 K), strong Ising-like magnetocrystalline anisotropy is observed with an out-of-plane ferromagnetic moments 5.98 μB/f.u. along the easy c axis, which is two orders of magnitude larger than that of field along a axis. Above T_{{text{C}}}^{{{text{Tb}}}}, a field-induced metamagnetic transition is observed from the spin-flip of Mn sublattices. During this transition, remarkable magnetostriction effect is observed, indicating of strong spin–lattice coupling. The responses of Tb and Mn sublattices to the magnetic field generate a giant magnetic entropy change (- Delta S_{M}) and large values of relative cooling power (RCP) and temperature-averaged entropy change (TEC). The calculated maximum magnetic entropy change (- Delta S_{M}^{max }), RCP, and TEC(10) with magnetic field change of 7 T along c axis reach 24.02 J kg−1 K−1, 378.4 J kg−1, and 21.39 J kg−1 K−1 near T_{{text{C}}}^{{{text{Tb}}}}, which is the largest among RMn2Ge2 families. More importantly, this giant MCE shows plateau behavior with wide window temperatures from 93 to 108 K, making it be an attractive candidate for magnetic refrigeration applications.

The Anisotropic Magnetocaloric Effect and Size-Dependent Magnetic Properties of Iron Particles

We present a theoretical study on the anisotropic magnetocaloric effect and the size-dependent magnetic properties of Fe particles of radii in the range 25–150 Å. An observable increase has been found in the magnetization, of the low radii (25–75 Å) particles, by reducing the temperature to 4 K. The anisotropic isothermal change in entropy ΔSm has been calculated by taking the difference between maximum ΔSm along the easy [100] and hard [111] directions. The maximum anisotropic ΔSm is 0.015 J/kg K for a field change of 500 Oe along the [100] direction. The ΔSm temperature dependence exhibits a table-like plateau for small radii (25–75 Å) and in low fields below 300Oe. This enhances the relative cooling power (RCP) of the Fe element to be 8.11 J/kg for particles of 25 Å radius. Also, the calculation of anisotropic ΔTad was performed along the easy axis and showed an increase in the maximum value around 37% relative to the experimental conventional value.

Magnetic and anisotropic magnetocaloric effects of HoCoSi fast quenching ribbons

The performance of magnetocaloric effect materials is one of the key factors restricting the development of magnetic refrigeration technology. Materials with anisotropic magnetocaloric effect can be used in the rotary magnetic refrigeration technology, which is beneficial to the simplification of refrigeration devices. In this work, the magnetic properties, magnetocaloric effects, and magnetic anisotropies of rapidly quenched HoCoSi compounds are investigated. At low temperatures below <i>T</i><sub>t</sub> = 5.7 K, the HoCoSi ferromagnetism and helical magnetism coexist. With the increase of temperature, the HoCoSi undergoes a second-order phase transition from ferromagnetic (FM) to paramagnetic (PM) phase at <i>T</i><sub>C</sub> = 13.7 K. Both XRD and SEM show that the HoCoSi has a preferred orientation. In order to obtain a large magnetocaloric effect and to determine the effect of preferred orientation on magnetism and magnetocaloric effect, the isothermal magnetization curves of the 10 m/s–HoCoSi fast quenched belt in the directions of <i>H</i> parallel and perpendicular to texture around the Curie temperature are analyzed. The corresponding magnetic entropy change (–Δ<i>S</i><sub>M</sub>) and magnetic refrigeration capacity (RC) are calculated. Under the magnetic field changing from 0 to 5 T, the value of –Δ<i>S</i><sub>M</sub> is 22 J/(kg·K) in the direction of <i>H</i> parallel to the texture and 12 J/(kg·K) in the direction of <i>H</i> perpendicular to texture , and their corresponding values of RC(RCP)are 360 (393.8) J·kg<sup>–1</sup> and 160 (254.4) J/kg. The value of –Δ<i>S</i><sub>M</sub> reaches 12.5 J/(kg·K)even at <i>μ</i><sub>0</sub><i>H</i> = 0–2 T in the direction of H parallel to the texture. It is obvious that the 10-m/s-HoCoSi fast quenching belt shows a large low-field magnetocaloric effect and obvious magnetic anisotropy, which is expected to be used to realize the magnetic refrigeration technology of rotating samples.

Mean-Field Modeling of Magnetocaloric Effect of Antiferromagnetic Compounds

Antiferromagnetic compounds are known in the literature to present the inverse magnetocaloric effect (MCE). This effect is characterized by the negative adiabatic temperature change, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\Delta T_{S}$</tex-math></inline-formula> , of an antiferromagnetic material when submitted to an applied magnetic field. In an isothermal process, a positive entropy change, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\Delta S_{T}$</tex-math></inline-formula> , is also expected. More recently, the anisotropic character of antiferromagnetic compounds, due to spin-flop and spin-flip transitions, has been pointed out highlighting the applicability of the antiferromagnetic compounds in a rotary magnetocaloric device. <p xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">In this work, we systematically investigated a mean-field model that describes the antiferromagnetic behaviour of materials in a multisublattice approach. Our model includes the nearest and next-nearest neighbour exchange interaction, the Zeeman effect, and a uniaxial anisotropy energy. We investigated the effect of anisotropy on the spin-flop and spin-flip transitions on the usual and anisotropic MCE. We also demonstrated and verified an area rule for —<inline-formula><tex-math notation="LaTeX">$\Delta S_{T}$</tex-math></inline-formula> vs. T curves that can be used on compounds where the saturation magnetization is magnetic field dependent.

Role of magnetocrystalline anisotropy on anisotropic magnetocaloric effect in single crystals

The role of magnetocrystalline anisotropy in single crystals played on the anisotropic magnetocaloric effect is studied based on Monte Carlo simulation. By taking into account the anisotropy, the spin reorientation transition (SRT) temperature (TSRT) may be higher than the Curie temperature and enhanced with larger anisotropy, and the magnetization behaviors at low temperatures below TSRT and under weak fields are highly sensitive to the anisotropy. The anisotropy of entropy change is the most significant when the magnetic field is parallel to the easy axis, while the maximum entropy change may increase or decrease with the anisotropy constant in a given direction depending on the magnetic field strength. Power-law fits have been conducted on the field dependence of the maximum entropy change and relative cooling power, which not only indicate a characteristic of the second-order phase transition but also demonstrate effect of anisotropy on magnetic order and dynamics during the SRT to contribute to the anisotropic magnetocaloric effect.

Giant conventional and rotating magnetocaloric effects in TbScO3 single crystal

Magnetocaloric effect (MCE) shows great potential in refrigeration field and especially fundamental scientific research with cooling requirement. In this work, we studied the anisotropic magnetic and magnetocaloric properties of TbScO3 single crystal, a popular substrate used for depositing epitaxial ferroelectric films. Our results indicate a strong antiferromagnetic ordering below TN ~ 3.1 K in orthorhombic TbScO3 single crystal. Large magnetocrystalline anisotropy exists between the magnetic easy ab plane and the hard c axis, leading to a giant anisotropic MCE. In field changes of 20 and 50 kOe along the a axis, large magnetic entropy changes reach 15.25 and 23.71 J/kg K at 3 K and 7 K, respectively, while the magnetic entropy changes along the c axis are negligible. As a result, large rotating magnetic entropy changes of 15.27 and 23.63 J/kg K are obtained by rotating TbScO3 single crystal with constant fields of 20 and 50 kOe lying in the ac plane. The large anisotropic MCE of TbScO3 single crystal indicates this material as a promise refrigerant candidate for rotating magnetic refrigeration technique near the helium temperature.

Magnetic Properties of the Hexagonal Ferromagnet NdCrGe3 Showing Metamagnetic Transition and Negative Magnetocaloric Effect

Single crystals of a hexagonal ferromagnet NdCrGe3 with one-dimensional crystal structure are synthesized, and the magnetic properties are comprehensively investigated, exhibiting large magnetic anisotropy and complex magnetic structure. Besides the ferromagnetic transition at TC = 101 K, we observe a sharp decrease in magnetization at T = 55 K and another two phase transitions at T = 31 and 15 K. These phase transitions imply complex and anisotropic magnetic structure in NdCrGe3. Below T = 55 K, metamagnetic transitions and negative magnetocaloric effects are detected under H//ab. Additionally, the critical properties around TC = 101 K and the anisotropic magnetocaloric effect are investigated in detail.

Anisotropic magnetocaloric effect and magnetoresistance in antiferromagnetic HoNiGe3 single crystal

We report anisotropic magnetocaloric effect and magnetoresistance in antiferromagnetic HoNiGe3 single crystal grown by Ge flux method. HoNiGe3 single crystal exhibits antiferromagnetic order and large magnetocrystalline anisotropy below the Néel temperature TN = 10.5 K. Meanwhile, with increasing the magnetic field, HoNiGe3 undergoes the spin-flip transition induced by the magnetic field along the a axis, while the spin-flop transition occurs for the field along the other orientations, which gives rise to anisotropic magnetoresistance behavior along three axes. With the magnetic field change of 0–50 kOe, the maximum magnetic entropy changes obtained along the a, b, and c axes are −13.9, 2.5 and −7.7 J kg−1K−1, respectively. The maximum rotating magnetic entropy change is −12.3 J kg−1K−1 under 50 kOe by rotating the magnetic field from the b axis to the a axis, and the corresponding refrigeration capacity is 193 J/kg, which demonstrates HoNiGe3 to be an attractive candidate for novel rotating magnetic refrigeration at low temperature region.

Large Anisotropic Magnetocaloric Effect, Wide Operating Temperature Range, and Large Refrigeration Capacity in Single-Crystal Mn5Ge3 and Mn5Ge3/Mn3.5Fe1.5Ge3 Heterostructures.

At present, the studies on magnetocaloric properties are mainly based on polycrystalline materials, which is not enough to reveal and understand the origin of their magnetocaloric effect. In addition, finding new room temperature magnetocaloric materials is crucial to the development and application for room temperature magnetic refrigeration. Here, we report the magnetic transitions, magnetic anisotropy, and magnetocaloric properties of single-crystal Mn5Ge3 and Mn5Ge3/Mn3.5Fe1.5Ge3 heterostructures with six (100) surfaces and the [001] growth direction prepared using the Sn flux method. Mn5Ge3 (Mn3.5Fe1.5Ge3) undergoes a sharp paramagnetic-collinear ferromagnetic transition at 299 (332) K and weak collinear-noncollinear ferromagnetic transition at 65 (35) K. Owing to the distinct spin arrangements and magnetic moments of Mn5Ge3 and Mn3.5Fe1.5Ge3, the magnetic anisotropy of the single crystal is stronger than that of the heterostructure below 299 K. Moreover, a large anisotropic magnetocaloric effect, wide operating temperature range, and large refrigeration capacity near room temperature are obtained in these two materials, especially the magnetocaloric effect of the heterostructure presents a tablelike shape due to the adjacent paramagnetic-collinear ferromagnetic transitions of Mn5Ge3 and Mn3.5Fe1.5Ge3. Under 0-3 T, the maximum magnetic entropy change, operating temperature range, and refrigeration capacity of the single crystal (heterostructure) are 5.19 (2.96) J kg-1 K-1, 43 (57) K, and 223 (169) J kg-1 when H//c, respectively. These features make them candidates for room temperature magnetic refrigeration.

Anisotropic magnetocaloric effect in a dysprosium(III) single-molecule magnet — Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

Dysprosium compounds with high magnetic anisotropy are widely studied as single molecule magnets (SMMs). Here the anisotropic magnetocaloric effect in a Dy(III) SMM, {[Dy(OSiMe3)2(4-Mepy)5(BPh4)] 0.5Toluene}, was studied by single crystals. Angular dependent magnetization can be observed at 300 K because of its high magnetic anisotropy. SMM behavior measured along the easy axis direction is identical to that of the polycrystalline sample. Rotating magnetization from the easy axis to the hard plane gives a maximum magnetic entropy change (–ΔSR) of 3.05 J/(kg∙K) at 19 K at ΔB = 5 T, which enables the Dy(III) SMM to be used as a low-temperature rotating magnetic refrigerant.

Critical behavior and anisotropic magnetocaloric effect of the quasi-one-dimensional hexagonal ferromagnet PrCrGe3

Critical properties and anisotropic magnetocaloric effect of hexagonal ferromagnet $\mathrm{Pr}\mathrm{Cr}{\mathrm{Ge}}_{3}$ single crystals were investigated. The critical exponents $\ensuremath{\beta}=0.352$ with a critical temperature ${T}_{C}=90.5\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ and $\ensuremath{\gamma}=1.026$ with ${T}_{C}=90.6\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ are obtained by the modified Arrott plot, whereas $\ensuremath{\delta}=3.98$ is deduced by a critical isotherm analysis. The critical exponents suggest a long-range magnetic coupling with the exchange distance decaying as $J(r)\ensuremath{\sim}{r}^{\ensuremath{-}4.6}$. Furthermore, the magnetic entropy change $\ensuremath{-}\mathrm{\ensuremath{\Delta}}{S}_{M}$ reaches a maximum value around ${T}_{C}$, i.e., $\ensuremath{-}\mathrm{\ensuremath{\Delta}}{S}_{M}\ensuremath{\sim}3.2(1.8)\phantom{\rule{0.28em}{0ex}}\mathrm{J}\phantom{\rule{0.28em}{0ex}}{\mathrm{kg}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$ with in-plane (out-of-plane) field change of 5 T, verifying large magnetic anisotropy. The rescaled $\ensuremath{-}\mathrm{\ensuremath{\Delta}}{S}_{M}(T,H)$ plots collapse onto a universal curve independent of temperature and field, confirming a second-order magnetic phase transition and reliability of the obtained critical exponents.

Theoretical prediction of large anisotropic magnetocaloric effect in MnP

Recent discovery of the rotating magnetocaloric effect in rare-earth and transition metal compounds opens up a potential application for the next generation of the cooling device with fast operation time and compact size. However, there are few theoretical works on this phenomenon. We study the anisotropic magnetocaloric effect in MnP by combining first-principles calculations and Monte-Carlo simulations. The magnetocrystalline anisotropy energy is not negligible even above the Curie temperature due to the effect of the external magnetic field on the magnetization. The dependence of the isothermal magnetic entropy change on the direction of an applied magnetic field is quantitatively reproduced by using our model. The large rotating magnetic entropy changes in MnP are predicted theoretically.

Large rotational magnetocaloric effect in GdVO4 single crystal

The magnetic properties and magnetocaloric effect (MCE) in GdVO4 single crystal have been investigated systematically. In addition to the previously reported spin-flop transition at 1 T along the c-axis, other spin-flop transitions also occur along the a and b axes at 1.7 T. Meanwhile, prominent magnetic anisotropy is observed below the paramagnetic temperature, which leads to evident distinction of negative magnetic entropies along the a, b, and c axes. The maximum negative magnetic entropy −ΔSM along the three axes are 45.91, 46.17, and 56.03 J/kg × K, respectively, at H = 7 T. The anisotropic MCE between the c and a, b axes also induces large rotational MCE (RMCE) in the bc plane, with the maximum value −ΔSR,bc reaching 10.1 J/kg × K at H = 7 T. These remarkable MCE and RMCE values at low temperatures make the GdVO4 single crystal a potential candidate for applications in cryogenic magnetic refrigeration areas.

Anisotropic magnetocaloric effect and critical behavior in CrCl3

We report anisotropic magnetocaloric effect and magnetic critical behavior in the van der Waals crystal ${\mathrm{CrCl}}_{3}$. The maximum magnetic entropy change $\ensuremath{-}\mathrm{\ensuremath{\Delta}}{S}_{M}^{\mathrm{max}}\ensuremath{\sim}14.6$ J ${\mathrm{kg}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$ and the relative cooling power $\text{RCP}\ensuremath{\sim}340.3$ J ${\mathrm{kg}}^{\ensuremath{-}1}$ near ${T}_{c}$ with a magnetic field change of 5 T are much larger when compared to ${\mathrm{CrI}}_{3}$ or ${\mathrm{CrBr}}_{3}$. The rescaled $\mathrm{\ensuremath{\Delta}}{S}_{M}(T,H)$ curves collapse onto a universal curve, confirming the second-order ferromagnetic transition. Further critical behavior analysis around ${T}_{c}$ presents a set of critical exponents $\ensuremath{\beta}=0.28(1)$ with ${T}_{c}=19.4(2)\phantom{\rule{4pt}{0ex}}\mathrm{K}$, $\ensuremath{\gamma}=0.89(1)$ with ${T}_{c}=18.95(8)\phantom{\rule{4pt}{0ex}}\mathrm{K}$, and $\ensuremath{\delta}=4.6(1)$ at ${T}_{c}=19\phantom{\rule{4pt}{0ex}}\mathrm{K}$, which are close to those of the theoretical tricritical mean-field model.

Anisotropic magnetocaloric effect and critical behavior in CrSbSe3

We report anisotropic magnetocaloric effect and critical behavior in quasi-one-dimensional ferromagnetic CrSbSe$_3$ single crystal. The maximum magnetic entropy change $-\Delta S_M^{max}$ is 2.16 J kg$^{-1}$ K$^{-1}$ for easy $a$ axis (2.03 J kg$^{-1}$ K$^{-1}$ for hard $b$ axis) and the relative cooling power $RCP$ is 163.1 J kg$^{-1}$ for easy $a$ axis (142.1 J kg$^{-1}$ for hard $b$ axis) near $T_c$ with a magnetic field change of 50 kOe. The magnetocrystalline anisotropy constant $K_u$ is estimated to be 148.5 kJ m$^{-3}$ at 10 K, decreasing to 39.4 kJ m$^{-3}$ at 70 K. The rescaled $\Delta S_M(T,H)$ curves along all three axes collapse onto a universal curve, respectively, confirming the second order ferromagnetic transition. Further critical behavior analysis around $T_c \sim$ 70 K gives that the critical exponents $\beta$ = 0.26(1), $\gamma$ = 1.32(2), and $\delta$ = 6.17(9) for $H\parallel a$, while $\beta$ = 0.28(2), $\gamma$ = 1.02(1), and $\delta$ = 4.14(16) for $H\parallel b$. The determined critical exponents suggest that the anisotropic magnetic coupling in CrSbSe$_3$ is strongly dependent on orientations of the applied magnetic field.

Anisotropic magnetocaloric properties of the ludwigite single crystal Cu2MnBO5

We report upon the specific heat and magnetocaloric properties of Cu2MnBO5 over a temperature range of 60–350 K and in magnetic fields up to 18 kOe. It is found that at temperatures below the Curie temperature (TC ∼ 92 K), CP(T)/T possesses a linear temperature-dependent behavior, which is associated with the predominance of two-dimensional antiferromagnetic interactions of magnons. The temperature independence of CP/T = f(T) is observed in the temperature range of 95–160 K, which can be attributed to the excitation of the Wigner glass phase. The magnetocaloric effect [i.e., the adiabatic temperature change, ΔTad (T,H)] is assessed through a direct measurement or an indirect method using the CP(T,H) data. Owing to its strong magnetocrystalline anisotropy, an anisotropic magnetocaloric effect (MCE) or the rotating MCE [ΔTadrot (T)] is observed in Cu2MnBO5. A deep minimum in the ΔTadrot (T) near the TC is observed and ascribed to the anisotropy of the paramagnetic susceptibility.

Large anisotropic magnetocaloric effect in ferromagnetic semimetal PrAlSi

We report on the large anisotropic magnetocaloric effect of PrAlSi, a ferromagnetic semimetal of current interest with a probable topologically nontrivial electronic structure. The maximum magnetic entropy change amounts to −ΔSM=22.6J/kgK near the Curie temperature TC=17.8K under a magnetic field change of μ0ΔH=5T along the magnetic easy c axis. A highly relevant feature is the small crystalline electric field splitting of the Pr3+ (J=4) multiplet, which appears to be comparable with the effective exchange interaction in the magnetic ordering. This leads to the full saturation moment of the Pr3+ ion in small fields and an accumulation of magnetic entropy in the vicinity of the magnetic ordering. The weakly first-order nature of the ferromagnetic transition and the subsequent reentrant spin-glass transitions below TC are features further enhancing the magnetocaloric effect. Given the strong magnetic anisotropy, a large rotating magnetocaloric effect becomes achievable in this material.