Magnetocaloric Properties of Zinc-Nickel Ferrites Around Room Temperature

Maalam, K. El; Fkhar, L.; Hamedoun, M.; Mahmoud, Abdelfattah; Boschini, Frèdéric; Hlil, E.K.; Benyoussef, A.; Mounkachi, O.

doi:10.1007/s10948-016-3961-9

Cited by 31 publications

(4 citation statements)

References 28 publications

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“…This is one half of those in manganites and much lower than in ferrites. 35,36 Fitting of the −∆S max M and RCP gives n = 0.603 (6) and m = 1.20 (1), which are close to the values estimated from the critical exponents (Table I).…”

Section: Resultssupporting

confidence: 81%

Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$

Liu,

Li,

Tao

et al. 2019

Preprint

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We present a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe3−xGeTe2 that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-dependent and most likely favors the long-range magnetic order in thin Fe3−xGeTe2 crsytal. The magnetic entropy change −∆SM also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a universal curve. The peak value −∆S max M of 1.20 J kg −1 K −1 and the corresponding adiabatic temperature change ∆T ad of 0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. By fitting of the field-dependent parameters of −∆S max M and the relative cooling power RCP, it gives −∆S max M ∝ H n with n = 0.603( 6) and RCP ∝ H m with m = 1.20(1) when H//c. Given the high and tunable Tc, Fe3−xGeTe2 crystals are of interest for fabricating the heterostructure-based spintronics device.

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Section: Resultssupporting

confidence: 81%

Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$

Liu,

Li,

Tao

et al. 2019

Preprint

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“…The RCP is 113.3 J kg −1 within field change of 5 T for Fe 3− x GeTe 2 . This is one half of those in manganites and much lower than in ferrites 35,36 . Fitting of the and RCP gives n = 0.603(6) and m = 1.20(1), which are close to the values estimated from the critical exponents (Table 1).…”

Section: Resultsmentioning

confidence: 69%

Anisotropic magnetocaloric effect in Fe3−xGeTe2

Liu

Tao

et al. 2019

Sci Rep

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We present a comprehensive study on anisotropic magnetocaloric porperties of the van der Waals weak-itinerant ferromagnet Fe3−xGeTe2 that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-dependent and most likely favors the long-range magnetic order in thin Fe3−xGeTe2 crsytal. The magnetic entropy change ΔSM also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a universal curve. The peak value $$-\Delta {S}_{M}^{{\max }}$$−ΔSMmax of 1.20 J kg−1 K−1 and the corresponding adiabatic temperature change ΔTad of 0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. By fitting of the field-dependent parameters of $$-\Delta {S}_{M}^{{\max }}$$−ΔSMmax and the relative cooling power RCP, it gives $$-{\rm{\triangle }}{S}_{M}^{{\max }}$$−∆SMmax ∝ Hn with n = 0.603(6) and RCP ∝ Hm with m = 1.20(1) when H//c. Given the high and tunable Tc, Fe3−xGeTe2 crystals are of interest for fabricating the heterostructure-based spintronics device.

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“…36 Actually, the RCP also depends on the magnetic field H with the rule RCP = bH m , where m is related to the critical exponent δ as follows , which is about one half of those in manganites and one order of magnitude lower than in ferrites. 37,38 Fitting of the −∆S max M gives that n = 0.64(1) [ Fig. 8(a)], which deviates the value of n = 0.667 in the mean-field theory and is close to that of n = 0.637 in the threedimensional (3D) Heisenberg model, in line with its localized magnetism nature.…”

Section: Resultsmentioning

confidence: 74%

Anisotropic magnetocaloric effect in single crystals of CrI3

Liu

Petrović

2018

Phys. Rev. B

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We report a systematic investigation of dc magnetization and ac susceptibility, as well as anisotropic magnetocaloric effect in bulk CrI3 single crystals. A second-stage magnetic transition was observed just below the Curie temperature Tc, indicating a two-step magnetic ordering. The low temperature thermal demagnetization could be well fitted by the spin-wave model rather than the single-particle model, confirming its localized magnetism. The maximum magnetic entropy change −∆S max M ∼ 5.65 J kg −1 K −1 and the corresponding adiabatic temperature change ∆T ad ∼ 2.34 K are achieved from heat capacity analysis with the magnetic field up to 9 T. Anisotropy of ∆SM (T, H) was further investigated by isothermal magnetization, showing that the difference of −∆S max M between the ab plane and the c axis reaches a maximum value ∼ 1.56 J kg −1 K −1 with the field change of 5 T. With the scaling analysis of ∆SM , the rescaled ∆SM (T, H) curves collapse onto a universal curve, indicating a second-order type of the magnetic transition. Furthermore, the −∆S max M follows the power law of H n with n = 0.64(1), and the relative cooling power RCP depends on H m with m = 1.12(1).

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Magnetocaloric Properties of Zinc-Nickel Ferrites Around Room Temperature

Cited by 31 publications

References 28 publications

Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$

Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$

Anisotropic magnetocaloric effect in Fe3−xGeTe2

Anisotropic magnetocaloric effect in single crystals of CrI3

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