High-efficiency magnetic refrigeration using holmium

Terada, Noriki; Mamiya, Hiroaki

doi:10.1038/s41467-021-21234-z

Cited by 78 publications

(30 citation statements)

References 30 publications

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“…Magnetic materials with promising functional performances have attracted increasing research interests due to their own potential or practical applications in various industries and our daily life aspects [1][2][3][4][5][6][7][8][9][10]. The magnetocaloric (MC) effect-based solid-state magnetic refrigeration (MR) technology has been well recognized as an alternative technology to the presently used commercialized gas compression technology [5][6][7][8][9]. The MC effect is an inherent thermodynamic response, and it generally exists in various types of magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

“…The MC effect is an inherent thermodynamic response, and it generally exists in various types of magnetic materials. The magnitudes of the MC effect have a strong correlation with the corresponding magnetic phase transition (MPT); therefore, the investigation of the MC effects of magnetic materials can provide considerable valuable information for the better understanding of MPT [5][6][7][8][9]. Therefore, many magnetic materials have been synthesized and systematically determined with regard to the magnetic proper-ties, MPT, and MC performances not only to search for suitable candidates for active MR application at cryogenic and near room temperature but also to better understand the MPT of magnetic materials [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic properties and promising magnetocaloric performances in the antiferromagnetic GdFe2Si2 compound

et al. 2022

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The magnetocaloric (MC) effect-based solidstate magnetic refrigeration (MR) technology has been recognized as an alternative novel method to the presently commercialized gas compression technology. Searching for suitable candidates with promising MC performances is one of the most urgent tasks. Herein, combined experimental and theoretical investigations on the magnetic properties, magnetic phase transition, and cryogenic MC performances of GdFe 2 Si 2 have been performed. An unstable antiferromagnetic (AFM) interaction in the ground state has been confirmed in GdFe 2 Si 2 . Moreover, a huge reversible cryogenic MC effect and promising MC performances in GdFe 2 Si 2 have been observed. The maximum isothermal magnetic entropy change, temperature-averaged entropy change with 2 K lift, and refrigerant capacity for GdFe 2 Si 2 were 30.01 J kg −1 K −1 , 29.37 J kg −1 K −1 , and 328.45 J kg −1 at around 8.6 K with the magnetic change of 0-7 T, respectively. Evidently, the values of these MC parameters for the present AFM compound GdFe 2 Si 2 are superior to those of most recently reported rareearth-based MC materials, suggesting the potential application for active cryogenic MR.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic properties and promising magnetocaloric performances in the antiferromagnetic GdFe2Si2 compound

et al. 2022

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“…In recent years, various magnetic materials with outstanding performances have been developed and attracted extensive research interest [1][2][3][4][5][6][7][8]. Among them, the solid-state magnetic cooling (MC) method based on the magnetocaloric effect (MCE) of magnetic solids has been recognized as one of the most potential promising environmentally friendly and high-efficiency alternative methods to the well-used state-of-the-art gas compression cooling technique [1][2][3]. The MCE is a magnetothermodynamic response which manifests the temperature (entropy) change of magnetic solids by applying or removing the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Enhanced magnetocaloric performances and tunable martensitic transformation in Ni35Co15Mn35−xFexTi15 all-d-metal Heusler alloys by chemical and physical pressures

Qin

Huang

et al. 2021

Sci. China Mater.

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The solid-state magnetic cooling (MC) method based on the magnetocaloric effect (MCE) is recognized as an environmentally friendly and high-energy-efficiency technology. The search or design of suitable magnetic materials with large MCEs is one of the main targets at present. In this work, we apply the chemical and hydrostatic pressures in the Ni 35 Co 15 Mn 35−x Fe x Ti 15 all-d-metal Heusler alloys and systematically investigate their crystal structures, phases, and magnetocaloric performances experimentally and theoretically. All the alloys are found to crystallize in an ordered B2-type structure at room temperature and the atoms of Fe are confirmed to all occupy at sites Mn(B). The total magnetic moments decrease gradually with increasing Fe content and decreasing of volume as well. The martensitic transformation temperature decreases with the increase of Fe content, whereas increases with increasing hydrostatic pressure. Moreover, obviously enhanced magnetocaloric performances can also be obtained by applied pressures. The maximum values of magnetic entropy change and refrigeration capacity are as high as 15.61(24.20) J (kg K) −1 and 109.91(347.26) J kg −1 with ΔH = 20(50) kOe, respectively. These magnetocaloric performances are superior to most of the recently reported famous materials, indicating the potential application for active MC.

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“…In addition, searching new materials of a large magnetocaloric effect is currently a hot topic to develop magnetic refrigeration [37], which will achieve high energy efficiency and will be used for hydrogen liquefaction [38]. In particular, a metamagnetic phase transition will be utilized to achieve a large magnetocaloric effect due to a considerable entropy change [39]. From this perspective, it is also important to establish a canonical phase diagram of itinerant ferromagnetism as well as metamagnetism.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of ferromagnetic and metamagnetic transitions in itinerant electron system

Yamase¹

2021

Preprint

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We analyze a mean-field model of itinerant electrons with an ferromagnetic interaction on a square lattice and perform a comprehensive study of the phase diagram in the three-dimensional space spanned by the chemical potential, a magnetic field, and temperature. The ferromagnetic phase is stabilized below a dome-shaped transition line T c (µ) with the maximal T c near van Hove filling. The transition is second order at high temperatures and becomes first order at low temperatures. When the interaction strength becomes large, another ferromagnetic dome is realized near the band edge with a quantum critical point at the band edge and a first-order transition on the other edge of the dome. The two ferromagnetic phases merge into one for further larger interaction strength. By applying a magnetic field, wing structures develop from the first-order transition lines at zero field. The wing describes a first-order transition surface, namely a metamagnetic transition. Notably, the metamagnetic transition occurs as a function of not only the field but also the chemical potential. The upper edge of the wing corresponds to a critical end line.When the system is tuned close to the band edge in the field, the wing can shrink and vanish, leading to a quantum critical end point (QCEP) at zero temperature. This QCEP is a Lifshitz point in the sense that the Fermi surface of either spin band vanishes. Close to the QCEP, another wing develops at very low temperatures in a higher field region. For a large interaction strength, however, the QCEP disappears. Furthermore, a metamagnetic transition occurs also inside the ferromagnetic phase without a magnetic field. Consequently another wing also develops from that by applying the field. These rich phase diagrams originate from the breaking of particle-hole symmetry in the presence of a next nearest-neighbor-hopping integral t ′ , which is expected in actual materials. We also find that ferromagnetic and metamagnetic transitions are usually accompanied by a Lifshitz transition at low temperatures, i.e., a change of a Fermi surface topology including the disappearance of a Fermi surface. Our obtained phase diagrams are discussed as a possible connection to itinerant ferromagnetic systems such as UGe 2 , UCoAl, ZrZn 2 , and others including magnetocaloric effect materials.

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High-efficiency magnetic refrigeration using holmium

Cited by 78 publications

References 30 publications

Magnetic properties and promising magnetocaloric performances in the antiferromagnetic GdFe2Si2 compound

Magnetic properties and promising magnetocaloric performances in the antiferromagnetic GdFe2Si2 compound

Enhanced magnetocaloric performances and tunable martensitic transformation in Ni35Co15Mn35−xFexTi15 all-d-metal Heusler alloys by chemical and physical pressures

Phase diagram of ferromagnetic and metamagnetic transitions in itinerant electron system

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