Magnetocaloric effect in La0.67Ca0.33MnOδ and La0.60Y0.07Ca0.33MnOδ bulk materials

Zhang, X. X.; Tejada, J.; Yong, Xin; Sun, Gang; Wong, K. W.; Bohigas, Xavier

doi:10.1063/1.117218

Cited by 258 publications

(97 citation statements)

References 18 publications

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“…It is adequate to consider the magnetization curves to be isothermal for a sufficiently low sweeping rate of the magnetic field [5,6,25]. The magnetic entropy change, 2DS M, , can then be calculated by using the magnetization data and the numerical formula [8] …”

Section: -1mentioning

confidence: 99%

“…Up to now, most of MCE applications still remain in the low temperature range ͑,20 K͒ by using paramagnetic salts, e.g., Gd 3 Ga 3 O 12 [2]. For the MCE applications at high temperatures, different types of materials must be used [3][4][5][6]. The MCE in the superparamagnetic nanostructured materials has been recently studied by Shull and co-workers [7][8][9][10].…”

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Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

et al. 2001

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We report the first experimental observation of anisotropic magnetocaloric effect (MCE) in the Fe 8 clusters. It is found that the magnetic anisotropy plays a very important role in the determination of the magnetocaloric effect. The maximum and minimum MCE's are observed when the applied magnetic fields are parallel and perpendicular to the easy axis, respectively. The quantum spin Hamiltonian of a Fe 8 cluster is used to calculate the partition function and the magnetization in a range of temperature and magnetic field. Excellent quantitative agreement between the experimental data and calculation is observed. DOI: 10.1103/PhysRevLett.87.157203 PACS numbers: 75.30.Gw, 75.30.Sg, 75.50.Tt, 75.50.Xx It is well known that the magnetocaloric effect (MCE) has been useful in achieving very low temperatures (mK range) [1]. Up to now, most of MCE applications still remain in the low temperature range ͑,20 K͒ by using paramagnetic salts, e.g., Gd 3 Ga 3 O 12 [2]. For the MCE applications at high temperatures, different types of materials must be used [3][4][5][6]. The MCE in the superparamagnetic nanostructured materials has been recently studied by Shull and co-workers [7][8][9][10]. The results indicate that at higher temperatures the MCE is larger in the superparamagnetic nanostructures composites than in the pure paramagnetic materials. This makes the nanostructured composites appear to be very attractive candidates for the magnetic refrigeration in a very big temperature span. This enhancement was discussed by Shull et al. in considering a superparamagnetic system consisting of monosized and noninteracting magnetic clusters uniformly dispersed in a nonmagnetic media [7,10].It is well known that most magnetic nanoparticles or clusters exhibit a quite strong uniaxial magnetic anisotropy due to shape, stress, or surface effects [11], which governs the magnetic behavior of the particles [11,12]. Therefore, it is essential to understand the effect of the magnetic anisotropy in the MCE, particularly for the superparamagnetic materials. However, not much effort has been devoted to it. The reason could be that the materials used for magnetic refrigerants are either the ideal paramagnetic salts [2] or soft magnetic materials [3 -6] and therefore the effect of magnetic anisotropy is negligible. Theoretically, the anisotropic MCE was studied by using the Monte Carlo simulation for bulk ferromagnetic materials (or interacting magnetic clusters) with a uniaxial anisotropy in the vicinity of the Curie temperature [13]. Experimentally, a clean study of the anisotropic effect is generally hindered by the distribution of sizes and/or interactions. In this Letter, we report the anisotropy effect on the MCE in Fe 8 magnetic molecular crystals. With monosized clusters and well-defined anisotropic properties, this system offers, for the first time, a definite confirmation of the anisotropic MCE. It is shown that the magnetic anisotropy is important for both the qualitative and quantitative aspects of the MCE.The cluster Fe 8 with ...

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Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

et al. 2001

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“…For LBMO40 and LCMO40, Tc's of 312 K and 262 K respectively have been identified in keeping with the literature. 26,27 These low Tc's are in line with neither material exhibiting significant magnetic hyperthermia at room temperature.…”

Section: Magnetic Measurementsmentioning

confidence: 51%

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

McBride

Partridge

Bennington-Gray

et al. 2017

Materials Research Bulletin

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Highlights• La1-xCaxMnO3 and La1-xBaxMnO3 synthesised using the modified peroxide sol-gel synthesis.• Enhanced magnetic heating for manganates doped with A-site cations larger than La 3+ .• Reduced magnetic heating observed for manganates doped with A-site cations smaller than La 3+ . 1 AbstractThe effect of the A-site dopant ionic radii on the observed magnetocaloric effect (MCE) exhibited by three different families of manganese-based perovskites was investigated using both induction heating and SQUID magnetometry measurements. The doped perovskites La1-xSrxMnO3 (LSMO), La1-xCaxMnO3 (LCMO), and La1-xBaxMnO3 (LBMO) (x = 0.25, 0.35, 0.4) were prepared using a modified peroxide sol-gel synthesis. This method has not been previously used for the synthesis of LCMO or LBMO. Structural characterisation of the agglomerates of magnetic nanoparticles (MNP) for each material was carried out using SEM, XRD and IR spectroscopy. Magnetic heating was observed for materials with larger A-site dopant radii relative to La 3+ ; LSMO40 and LBMO40, with average SARs obtained of 51.5 Wg -1 Mn and 33.8Wg -1 Mn respectively. However, reduced magnetic heating effects were observed for smaller A-site dopant radii relative to La 3+ (LCMO). In fact, the calculated Specific Absorption Rate for LCMO40 of 14.72 Wg -1 Mn is half that of the blank.

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“…In this work, the magnetocaloric effect of the La 0.7 Ba 0.3 Mn 1-x Fe x O 3 compound was investigated. Materials with proper Curie temperature and large spontaneous magnetization have many peculiar properties that are attractive for applications as magnetic refrigerants [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Magnetic Entropy Change on La_0.7Ba_0.3Mn_1-xFe_xO₃Compound

Hwang¹,

Jang²,

Kim³

et al. 2013

Journal of Magnetics

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The magnetocaloric effect and magnetization behavior have been analyzed in the double-perovskite La 0.7 Ba 0.3 Mn 1-X Fe X O 3 compound with the sintering temperature at 1273 K. Samples were fabricated by the conventional solid-state reaction method. X-ray diffraction measurement revealed that all the samples had a single phase in orthorhombic. Detailed investigations of the magnetic entropy behavior of the samples were discussed with the variation of T C . The magnetic entropy changes, ΔS M of approximately 0.36-1.14 J/kg K were obtained in the temperature range of 145-350 K for the La 0.7 Ba 0.3 Mn 1-X Fe X O 3 compound. The enhancement of the magnetic entropy change is believed to be due to changes in the microstructure, which changes the magnetic part of the entropy of a solid around the magnetic ordering temperature.

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Magnetocaloric effect in La0.67Ca0.33MnOδ and La0.60Y0.07Ca0.33MnOδ bulk materials

Cited by 258 publications

References 18 publications

Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

The Magnetic Entropy Change on La_0.7Ba_0.3Mn_1-xFe_xO₃Compound

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Magnetocaloric effect in La0.67Ca0.33MnOδ and La0.60Y0.07Ca0.33MnOδ bulk materials

Cited by 258 publications

References 18 publications

Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

Anisotropic Magnetocaloric Effect in Nanostructured Magnetic Clusters

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

The Magnetic Entropy Change on La0.7Ba0.3Mn1-xFexO3Compound

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The Magnetic Entropy Change on La_0.7Ba_0.3Mn_1-xFe_xO₃Compound