Magnetocaloric effect and magnetic refrigeration

Pecharsky, V. K.; Gschneidner, K. A.

doi:10.1016/s0304-8853(99)00397-2

Cited by 1,474 publications

(726 citation statements)

References 74 publications

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“…Manifestation of diverse magnetic properties by the rare earth (R) transition metal (TM) intermetallic compounds in general and the occurrence of giant MCE in materials such as Gd 5 (Si,Ge) 4 in particular have made R-TM compounds as the natural probe for the fundamental studies as well as for applications based on MCE [1,[7][8][9]. Among the various R-TM intermetallics, RCo 2 (R=Er, Ho and Dy) compounds are known to exhibit considerable MCE due to the first order transition at their ordering temperature (T C ) [8].…”

Section: Introductionmentioning

confidence: 99%

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Singh¹,

Суреш²,

Rana³

et al. 2006

J. Phys.: Condens. Matter

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Abstract. We report the magnetic, magnetocaloric and magnetoresistance results obtained in Tb(Ni 1-x Fe x ) 2 compounds with x=0, 0.025 and 0.05. Fe substitution leads to an increase in the ordering temperature from 36 K for x=0 to 124 K for x=0.05. Contrary to a single sharp MCE peak seen in TbNi 2 , the MCE peaks of the Fe substituted compounds are quite broad. We attribute the anomalous MCE behavior to the randomization of the Tb moments brought about by the Fe substitution. Magnetic and magnetoresistance results seem to corroborate this proposition. The present study also shows that the anomalous magnetocaloric and magnetoresistance behavior seen in the present compounds is similar to that of Ho(Ni,Fe) 2 compounds.

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Section: Introductionmentioning

confidence: 99%

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Singh¹,

Суреш²,

Rana³

et al. 2006

J. Phys.: Condens. Matter

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“…The magnetocaloric effect in ferromagnets has attracted recently considerable attention both from the fundamental point of view and from the viewpoint of its practical applications [1][2][3]. Technical use of this effect is based on a cyclic process, which includes the isothermal magnetic entropy change DS M upon magnetic field increase from H 1 to H 2 as well as adiabatic temperature change DT ad upon magnetic field decrease from H 2 to H 1 .…”

Section: Introductionmentioning

confidence: 99%

Magnetization and magnetic entropy change of a three-dimensional isotropic ferromagnet near the Curie temperature in the random phase approximation

Kokorina

Medvedev

2013

Physica B: Condensed Matter

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a b s t r a c tThe behavior of a three-dimensional isotropic Heisenberg ferromagnet in the presence of a magnetic field H is investigated in the random phase approximation (RPA) near the Curie temperature T c . It is shown that the magnetization M at the Curie temperature T c is described by the law MðT ¼ T c Þ $ H 1=5 and the initial magnetic susceptibility w 0 at temperatures T Z T c is given by w 0 ðT Z T c Þ $ ðTÀT c Þ À2 . It means that in the RPA the critical exponents for a three-dimensional Heisenberg ferromagnet coincide with the critical exponents for the Berlin-Kac spherical model of a ferromagnet rather than with the critical exponents of the mean field approximation (MFA). Hence it follows as well that, when a magnetic field H is risen from H ¼ 0 to H ¼ H a , the magnetic entropy S M will be decreased as

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“…(9) below the Walker breakdown with Φ(t) = const and X = υt leads to the result in Eq. (1). By comparing Eq.…”

Section: Magnetocaloritronic Circuit Elementmentioning

confidence: 99%

“…1 can in principle be used as a working body of a magnetic refrigerator exploiting the magnetocaloric effect [1]. Realization of such a refrigerator, however, necessitates some sort of switch connecting and disconnecting the circuit element to reservoirs.…”

Section: Magnetocaloritronic Coolingmentioning

confidence: 99%

“…While the traditional mechanical Carnot machines are based on the alternating adiabatic and isothermal processes controlled by the conjugate pair of variables (P,V), same thermodynamic principles can be put to work in the realizations of magnetic machines relying on the magnetocaloric effect [1]. These latter machines are operating in the space of the conjugate variables (H,M).…”

Section: Introductionmentioning

confidence: 99%

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Magnetocaloritronic nanomachines

Kovalev

Tserkovnyak

2010

Solid State Communications

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We introduce and study a magnetocaloritronic circuit element based on a domain wall that can move under applied voltage, magnetic field and temperature gradient. We draw analogies between the Carnot machines and possible devices employing such circuit element. We further point out the parallels between the operational principles of thermoelectric and magnetocaloritronic cooling and power generation and also introduce a magnetocaloritronic figure of merit. Even though the magnetocaloritronic figure of merit turns out to be very small for transition-metal based magnets, we speculate that larger numbers may be expected in ferromagnetic insulators.

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Magnetocaloric effect and magnetic refrigeration

Cited by 1,474 publications

References 74 publications

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Magnetization and magnetic entropy change of a three-dimensional isotropic ferromagnet near the Curie temperature in the random phase approximation

Magnetocaloritronic nanomachines

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Magnetocaloric effect and magnetic refrigeration

Cited by 1,474 publications

References 74 publications

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni1−xFex)2compounds

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni1−xFex)2compounds

Magnetization and magnetic entropy change of a three-dimensional isotropic ferromagnet near the Curie temperature in the random phase approximation

Magnetocaloritronic nanomachines

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Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds

Role of Fe substitution on the anomalous magnetocaloric and magnetoresistance behaviour in Tb(Ni_1−xFe_x)₂compounds