Understanding the inverse magnetocaloric effect in antiferro- and ferrimagnetic arrangements

Ranke, P.J. von; Oliveira, N.A. de; Alho, B.P.; Plaza, E.J.R.; Sousa, V.S.R. de; Caron, L. G.; Reis, M. S.

doi:10.1088/0953-8984/21/5/056004

Cited by 91 publications

(63 citation statements)

References 31 publications

(64 reference statements)

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“…With the increase in magnetic field oriental disorder of the magnetic spins aligned opposite to magnetic field increases, resulting in increase of magnetic entropy [31]. Above 260 K, -∆S M is positive, implying a spin alignment.…”

Section: Resultsmentioning

confidence: 99%

Exchange bias in a mixed metal oxide based magnetocaloric compound YFe0.5Cr0.5O3

Sharma¹,

Singh²,

Mukherjee³

2016

Journal of Magnetism and Magnetic Materials

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Section: Resultsmentioning

confidence: 99%

Exchange bias in a mixed metal oxide based magnetocaloric compound YFe0.5Cr0.5O3

Sharma¹,

Singh²,

Mukherjee³

2016

Journal of Magnetism and Magnetic Materials

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“…68 According to the Néel's theory of ferrimagnetism, the observed M(T ) behavior corresponds to that denoted as P type in Néel notation. 67 The parameters that explain this behavior are x = , where μ Er (μ Fe ) and N Er (N Fe ) are the magnetic moments and the number of Er (Fe) atoms, respectively.…”

Section: Crystal and Magnetic Structures Of Er 2 Fe 17mentioning

confidence: 99%

Magnetovolume and magnetocaloric effects in Er2Fe17

et al. 2012

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Combining different experimental techniques, investigations in hexagonal P 6 3 /mmc Er 2 Fe 17 show remarkable magnetovolume anomalies below the Curie temperature, T C . The spontaneous magnetostriction reaches 1.6 × 10 −2 at 5 K and falls to zero well above T C , owing to short-range magnetic correlations. Moreover, Er 2 Fe 17 exhibits direct and inverse magnetocaloric effects (MCE) with moderate isothermal magnetic entropy S M , and adiabatic temperature T ad changes [ S M ∼ −4.7 J(kgK) −1 and T ad ∼ 2.5 K near the T C , and S M ∼ 1.3 J(kgK)and T ad ∼ −0.6 K at 40 K for H = 80 kOe, respectively, determined from magnetization measurements].The existence of an inverse MCE seems to be related to a crystalline electric field-level crossover in the Er sublattice and the ferrimagnetic arrangement between the magnetic moments of the Er and Fe sublattice. The main trends found experimentally for the temperature dependence of S M and T ad as well as for the atomic magnetic moments are qualitatively well described considering a mean-field Hamiltonian that incorporates both crystalline electric field and exchange interactions. S M (T ) and T ad (T ) curves are essentially zero at ∼150 K, the temperature where the transition from direct to inverse MCE occurs. A possible interplay between the MCE and the magnetovolume anomalies is also discussed.

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“…28,29 From Figure 9 we can see that at room temperature LSMO40 and LBMO40 are present in the ferromagnetic state, with LCMO40 in the paramagnetic state. Thus, the application of a magnetic field in the heating experiments causes LSMO40 and LBMO40 to heat up and undergo ferromagnetic to paramagnetic transitions and exhibiting a positive MCE in the process.…”

Section: Magnetic Measurementsmentioning

confidence: 97%

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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Understanding the inverse magnetocaloric effect in antiferro- and ferrimagnetic arrangements

Cited by 91 publications

References 31 publications

Exchange bias in a mixed metal oxide based magnetocaloric compound YFe0.5Cr0.5O3

Exchange bias in a mixed metal oxide based magnetocaloric compound YFe0.5Cr0.5O3

Magnetovolume and magnetocaloric effects in Er2Fe17

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

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