Magnetocaloric effect in MnSi

Arora, Parul; Chattopadhyay, M. K.; Roy, Sthitadhi

doi:10.1063/1.2768005

Cited by 36 publications

(28 citation statements)

References 18 publications

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“…Therefore, it is best to describe Σ M as an indication of the degree to which structural and magnetic degrees of freedom are coupled in a material, similar to magnetovolume coupling terms in the Bean and Rodbell model, which has been quite successful in analyzing magnetocalorics. 18,66 The strong correlation of ∆S M with Σ M highlights the importance of magnetostructural coupling in first order materials, but also indicates that magnetostruc-tural coupling is important for strong magnetocaloric performance in materials displaying second-order magnetic transitions. Figure 4: Σ M vs. T C for the known magnetocalorics and the candidate ferromagnetic materials.…”

Section: Resultsmentioning

confidence: 99%

“…In these systems, coupling of the spins and the lattice leads to a system with switchable magnetostructural state, so that a moderate magnetic field can induce a large change in the magnetic entropy of the system. 18,20,22 Inspired by these ideas, we propose here the use of computational screening to aid in discovery of new magnetocalorics. Recently, several high-throughput projects have used density functional theory (DFT) to calculate the total energies and electronic structures of hundreds of thousands of known and hypothetical materials.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, Gd shows a sizeable magnetic entropy change of 6.1 J kg −1 K −1 and adiabatic temperature change of 6.4 K for an applied field H = 2 T. 16 Phenomenological models can be used to describe the entropy change in these materials, but these models are descriptive rather than predictive. 17,18 The discovery of a "giant" magnetic entropy change in Gd 5 (Si,Ge) 4 in 1997 created new opportunities in the search for magnetocalorics. In Gd 5 (Si,Ge) 4 , a first-order coupled magnetic and structural transition leads to a greatly enhanced ∆S M .…”

Section: Introductionmentioning

confidence: 99%

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A Simple Computational Proxy for Screening Magnetocaloric Compounds

et al. 2017

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Alternating cycles of isothermal magnetization and adiabatic demagnetization applied to a magnetocaloric material can drive refrigeration in very much the same manner as cycles of gas compression and expansion. The material property of interest in finding candidate magnetocaloric materials is their gravimetric entropy change upon application of a magnetic field under isothermal conditions. There is, however, no general method of screening materials for such an entropy change without actually carrying out the relevant, time-and effort-intensive magnetic measurements. Here we propose a simple computational proxy based on carrying out non-magnetic and magnetic density functional theory calculations on magnetic materials. This proxy, which we refer to as the magnetic deformation Σ M , is a measure of how much the unit cell deforms when comparing the relaxed structures with and without the inclusion of spin polarization. Σ M appears to correlate very well with experimentally measured magnetic entropy change values. The proxy has been tested against 33 known ferromagnetic materials, including nine materials newly measured for this study. It has then been used to screen 134 ferromagnetic materials for which the magnetic entropyhas not yet been reported, identifying 30 compounds as being promising for further study. As a demonstration of the effectiveness of our approach, we have prepared one of these compounds and measured its isothermal entropy change. MnCoP, with T C = 575 K, shows a maximum ∆S M = −6.0 J kg −1 K −1 for an applied field of H = 5 T.2

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Simple Computational Proxy for Screening Magnetocaloric Compounds

et al. 2017

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“…The linear or near-linear RC dependence on external field is experimentally observed, for example in the results of Refs. [27], [54][55][56][57].…”

Section: Efficiency Of Magnetic Refrigerationmentioning

confidence: 99%

Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy—Magnetocaloric point of view

Szałowski

Balcerzak

Bobák

2011

Journal of Magnetism and Magnetic Materials

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The thermodynamics of a site-diluted ferromagnetic Heisenberg model for spin S = 1/2 with interaction anisotropy in spin space is investigated. The study is aimed at presenting the magnetocaloric properties of such a model, including the entropy and temperature changes in magnetization/demagnetization processes, generalized Grüneisen ratio as well as the quantities characterizing the efficiency of magnetic cooling cycles. The results are obtained using Pair Approximation (PA) method and extensively compared with the Molecular Field Approximation (MFA) calculations. The importance of interaction anisotropy and site-dilution is discussed. The inadequacy of the MFA approach (even on the qualitative level) is found for selected quantities, while PA provides the results which are consistent with the experimentally observed behaviour.

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“…49,50 Temperature dependence of the heat capacity has also been reported in MnSi, which suggest it could be used as a novel magnetocaloric materials. 51 To elucidate interesting physical phenomena of MnSi, which have not been clearly understood so far, making single-crystalline MnSi NWs is important because length scales of helimagnetic and skyrmion ordering of MnSi are intrinsically nanoscale. 40,52 Also, the MnSi NWs would provide opportunities for applications such as nanoscale magnetic refrigeration devices and nanospintronics.…”

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confidence: 99%

Synthesis and Applications of Noble Metal and Metal Silicide and Germanide 1-Dimensional Nanostructures

Yoon¹,

Yoo²,

Seo³

et al. 2012

Bulletin of the Korean Chemical Society

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This review covers recent developments in our group regarding the synthesis, characterization and applications of single-crystalline one-dimensional nanostructures based on a wide range of material systems including noble metals, metal silicides and metal germanides. For the single-crystalline one-dimensional nanostructures growth, we have employed chemical vapor transport approach without using any catalysts, capping reagents, and templates because of its simplicity and wide applicability. Au, Pd, and Pt nanowires are epitaxially grown on various substrates, in which the nanowires grow from seed crystals by the correlations of the geometry and orientation of seed crystals with those of as-grown nanowires. We also present the synthesis of numerous metal silicide and germanide 1D nanostructures. By simply varying reaction conditions, furthermore, nanowires of metastable phase, such as Fe 5 Si 3 and Co 3 Si, and composition tuned cobalt silicides (CoSi, Co 2 Si, Co 3 Si) and iron germanides (Fe 1.3 Ge and Fe 3 Ge) nanowires are synthesized. Such developments can be utilized as advanced platforms or building blocks for a wide range of applications such as plasmonics, sensings, nanoelectronics, and spintronics.

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Magnetocaloric effect in MnSi

Cited by 36 publications

References 18 publications

A Simple Computational Proxy for Screening Magnetocaloric Compounds

A Simple Computational Proxy for Screening Magnetocaloric Compounds

Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy—Magnetocaloric point of view

Synthesis and Applications of Noble Metal and Metal Silicide and Germanide 1-Dimensional Nanostructures

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