Theoretical investigation on the magnetocaloric effect in the intermetallic

Nóbrega, E.P.; Alho, B.P.; Gomes, M.B.; Ranke, P.J. von; Oliveira, N.A. de

doi:10.1016/j.jallcom.2011.05.097

Cited by 5 publications

(2 citation statements)

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“…Instead it is usually assumed that the main effect of the coupling will be to renormalize the phonon frequencies and to introduce a quartic term in the spin operators. The resulting Hamiltonian can either be solved in a mean field approximation,56 or using numerical methods such as Monte Carlo simulations 84, 85. De Oliveira extended the model to include disorder effects,86 while Santana et al studied the effects of hysteresis within the mean field approximation 87…”

Section: Theoretical Approachesmentioning

confidence: 99%

Materials Challenges for High Performance Magnetocaloric Refrigeration Devices

Smith

Bahl

Bjørk

et al. 2012

Advanced Energy Materials

485

262

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Magnetocaloric materials with a Curie temperature near room temperature have attracted significant interest for some time due to their possible application for high‐efficiency refrigeration devices. This review focuses on a number of key issues of relevance for the characterization, performance and implementation of such materials in actual devices. The phenomenology and fundamental thermodynamics of magnetocaloric materials is discussed, as well as the hysteresis behavior often found in first‐order materials. A number of theoretical and experimental approaches and their implications are reviewed. The question of how to evaluate the suitability of a given material for use in a magnetocaloric device is covered in some detail, including a critical assessment of a number of common performance metrics. Of particular interest is which non‐magnetocaloric properties need to be considered in this connection. An overview of several important materials classes is given before considering the performance of materials in actual devices. Finally, an outlook on further developments is presented.

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Section: Theoretical Approachesmentioning

confidence: 99%

Materials Challenges for High Performance Magnetocaloric Refrigeration Devices

Smith

Bahl

Bjørk

et al. 2012

Advanced Energy Materials

485

262

View full text Add to dashboard Cite

show abstract

“…However, they are not free from some empirical parameters. On the other hand, also Monte Carlo simulations are used to predict theoretically the magnetocaloric properties of materials [17][18][19][20][21][22]. Let us also mention the existence of a number of exactly solved spin models for which magnetocaloric quantities have been discussed within various approaches, such as the Jordan-Wigner transformation [23,24], Bethe ansatz-based quantum transfer matrix and nonlinear integral equations method [25,26], or generalized classical transfer matrix method and decoration-iteration mapping [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Normal and inverse magnetocaloric effect in magnetic multilayers with antiferromagnetic interlayer coupling

Szałowski

Balcerzak

2014

J. Phys.: Condens. Matter

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The thermodynamics of a spin-1/2 magnetic multilayer system with antiferromagnetic interplanar couplings is studied using the Pair Approximation method. The special attention is paid to magnetocaloric properties, quantified by isothermal entropy change. The multilayer consists of two kinds of magnetic planes, one of which is diluted. The intraplanar couplings in both planes have arbitrary anisotropy ranging between Ising and isotropic Heisenberg interactions. The phase diagram related to the occurrence of magnetic compensation phenomenon is constructed and discussed. Then the isothermal entropy change is discussed as a function of interaction parameters, magnetic component concentration and external magnetic field amplitude. The ranges of normal and inverse magnetocaloric effect are found and related to the presence or absence of compensation.

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