Magnetocaloric materials: From micro- to nanoscale

Belo, João H.; Pires, Ana L.; Araújo, João P.; Pereira, A. M.

doi:10.1557/jmr.2018.352

Cited by 60 publications

(45 citation statements)

References 159 publications

(201 reference statements)

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“…Their results showed that the largest magnetocaloric effect was witnessed at the applied field of 2 T and a temperature of 308.2 K, where a temperature drop of 12.9 K and refrigerant capacity of 135.22 J kg -1 T -1 was observed for the quenched sample. FeRh near to equimolar composition nowadays possesses one of the highest refrigerant capacities even surpassing Gd 5 Si 2 Ge 1.9 F 0.1 and MnFeP 0.45 As 0.55 alloys 40 . FeRh’s second-order transition takes place at the Curie temperature of T C = 650 K, where the phase changes from the ferromagnetic B2-phase to the γ-phase which is paramagnetic (PM).…”

Section: Introductionmentioning

confidence: 99%

Towards laser printing of magnetocaloric structures by inducing a magnetic phase transition in iron-rhodium nanoparticles

Nadarajah

Landers

Salamon

et al. 2021

Sci Rep

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The development of magnetocaloric materials represents an approach to enable efficient and environmentally friendly refrigeration. It is envisioned as a key technology to reduce CO2 emissions of air conditioning and cooling systems. Fe-Rh has been shown to be one of the best-suited materials in terms of heat exchange per material volume. However, the Fe-Rh magnetocaloric response depends on its composition. Hence, the adaptation of material processing routes that preserve the Fe-Rh magnetocaloric response in the generated structures is a fundamental step towards the industrial development of this cooling technology. To address this challenge, the temperature-dependent properties of laser synthesized Fe-Rh nanoparticles and the laser printing of Fe-Rh nanoparticle inks are studied to generate 2D magnetocaloric structures that are potentially interesting for applications such as waste heat management of compact electrical appliances or thermal diodes, switches, and printable magnetocaloric media. The magnetization and temperature dependence of the ink’s γ-FeRh to B2-FeRh magnetic transition is analyzed throughout the complete process, finding a linear increase of the magnetization M (0.8 T, 300 K) up to 96 Am2/kg with ca. 90% of the γ-FeRh being transformed permanently into the B2-phase. In 2D structures, magnetization values of M (0.8 T, 300 K) ≈ 11 Am2/kg could be reached by laser sintering, yielding partial conversion to the B2-phase equivalent to long-time heating temperature of app. 600 K, via this treatment. Thus, the proposed procedure constitutes a robust route to achieve the generation of magnetocaloric structures.

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Section: Introductionmentioning

confidence: 99%

Towards laser printing of magnetocaloric structures by inducing a magnetic phase transition in iron-rhodium nanoparticles

Nadarajah

Landers

Salamon

et al. 2021

Sci Rep

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“…In the last decade, it is possible to note a rapidly growing interest of the scientific community in the research related to applications involving the use of magnetic nanoparticles 1–18 . Among these studies, a particular attention has been devoted to the magnetocaloric property of the ultra-small nanoparticles (smaller than 50 nm) used for cooling purposes as discussed in the literature 2–6,9,11–13,15,17,19,20 .…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric materials with ultra-small magnetic nanoparticles working at room temperature

Dudek

Wolak

et al. 2019

Sci Rep

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Through the use of the Monte Carlo simulations utilising the mean-field approach, we show that a dense assembly of separated ultra-small magnetic nanoparticles embedded into a non-magnetic deformable matrix can be characterized by a large isothermal magnetic entropy change even upon applying a weak magnetic field with values much smaller than one Tesla. We also show that such entropy change may be very significant in the vicinity of the room temperature which effect normally requires an application of a strong external magnetic field. The deformable matrix chosen in this work as a host for magnetic nanoparticles adopts a thin film form with a large surface area to volume ratio. This in turn in combination with a strong magneto-volume coupling exhibited by this material allows us to show its suitability to be used in the case of a variety of applications utilising local cooling/heating such as future magnetic refrigerants.

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“…Since the discovery of its first compound (Cu 2 MnAl), which was surprisingly ferromagnetic despite not having any “magnetic” element in its composition, more than 1500 Heusler compounds have been discovered . The research on these compounds is far from over, mainly due to their possible role as superconductors, gap tunable semiconductors (between 0–4 eV), topological insulators, thermoelectrics, magnetoelectrics, magnetocalorics, etc , …”

Section: Introductionmentioning

confidence: 99%

“…For most technological applications this is insufficient since the temperature of interest is around room temperature, quite far from the 0 K assumed in the DFT calculations. Such a problem is particularly handicapping for the case of magnetocaloric materials whose region of interest is located just around its Curie temperature, hence adding additional importance to the thermodynamic behavior of the studied system …”

Section: Introductionmentioning

confidence: 99%

In‐Silico Thermodynamic Description of Heusler Compounds Applied to Magnetocalorics by Monte Carlo Simulations Starting from Ab‐Initio

et al. 2020

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Heusler compounds are one of the most versatile families of materials, showing a wide range of technological applications. Here we present a pure in-silico approach to fully study the physical properties of this promising family of materials as potential competitive magnetocalorics. The temperature and field dependence of the magnetization of three ternary Heusler compounds (Co 2 CrGa, Co 2 FeGa and Co 2 MnGa), as well as of two quaternary Heusler types (Co 2 Cr x Y 1-x Ga, Y=Fe and Mn) was simulated using DFT ab-initio and Random Path Sam- [a] complex oxides, thin films and nanoparticles and on the application of nuclear solid state techniques. Recent topics are magnetothermal and magnetostructural effects and their application on refrigeration and heat pumps.João Amaral obtained his PhD in Physics at the University of Aveiro in December 2009 and has dedicated most of his scientific career to the study of magnetism and magnetic materials. His main focus of research during MSc. and PhD. was on magnetocaloric materials for magnetic refrigeration applications. Recent research interests include rare-earth free permanent magnets, by optimizing their composition and production through nanostructuring techniques, in a combined effort with the use of theoretical tools such as Density Functional Theory and Ising/Heisenberg models.

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Magnetocaloric materials: From micro- to nanoscale

Abstract: Abstract

Cited by 60 publications

References 159 publications

Towards laser printing of magnetocaloric structures by inducing a magnetic phase transition in iron-rhodium nanoparticles

Towards laser printing of magnetocaloric structures by inducing a magnetic phase transition in iron-rhodium nanoparticles

Magnetocaloric materials with ultra-small magnetic nanoparticles working at room temperature

In‐Silico Thermodynamic Description of Heusler Compounds Applied to Magnetocalorics by Monte Carlo Simulations Starting from Ab‐Initio

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