Giant Rotating Magnetocaloric Effect in the Region of Spin-Reorientation Transition in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NdCo</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>Single Crystal

Никитин, С.А.; Skokov, Konstantin P.; Koshkid’ko, Yu. S.; Pastushenkov, Yu. G.; Иванова, Т. И.

doi:10.1103/physrevlett.105.137205

Cited by 123 publications

(65 citation statements)

References 16 publications

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“…Indeed, spin reorientation is a less-explored route to obtaining MCEs, typically examined in rare earth intermetallics [67]. Hard ferrites have also come under renewed investigation [68], but the largest effects are still seen in rare earth-based materials [69], This is not surprising given that they have the largest thermally-varying anisotropy constants, as is required in an analogous way to the large ∂M/∂T required for paraprocess-based MCE (Eq. 1 and Ref.…”

Section: Magnetic Refrigerant Comparisonmentioning

confidence: 99%

Magnetocaloric materials: The search for new systems

2012

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The prospect of efficient solid state refrigeration at room temperature is driving research into magnetic cooling engine design and magnetic phase transition-based refrigerants. In this Viewpoint an Ashby-style map of magnetic refrigerant properties is constructed, comparing popular materials with limits derived from an idealised first order transition model. This comparison demonstrates the potential for new magnetocaloric material systems to be established through structural control and optimisation at the atomic-, nano-and micro-scale.

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Section: Magnetic Refrigerant Comparisonmentioning

confidence: 99%

Magnetocaloric materials: The search for new systems

2012

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“…On the other hand, the competition between different magnetic exchange interactions in the orthorhombic RMn2O5 compounds results in strongly frustrated systems. Consequently, a large MCE could be obtained by rotating them between their easy and hard-axes in constant magnetic fields (Figure 1), instead of the conventional magnetization-demagnetization process (via field variation) [15,16,30,31]. This would enable the implementation of more compact and efficient magnetic refrigeration devices with a simplified design [1,15,16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

et al. 2017

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Thanks to the strong magnetic anisotropy shown by the multiferroic RMn 2 O 5 (R = magnetic rare earth) compounds, a large adiabatic temperature change can be induced (around 10 K) by rotating them in constant magnetic fields instead of the standard magnetization-demagnetization method. Particularly, the TbMn 2 O 5 single crystal reveals a giant rotating magnetocaloric effect (RMCE) under relatively low constant magnetic fields reachable by permanent magnets. On the other hand, the nature of R 3+ ions strongly affects their RMCEs. For example, the maximum rotating adiabatic temperature change exhibited by TbMn 2 O 5 is more than five times larger than that presented by HoMn 2 O 5 in a constant magnetic field of 2 T. In this paper, we mainly focus on the physics behind the RMCE shown by RMn 2 O 5 multiferroics. We particularly demonstrate that the rare earth size could play a crucial role in determining the magnetic order, and accordingly, the rotating magnetocaloric properties of RMn 2 O 5 compounds through the modulation of exchange interactions via lattice distortions. This is a scenario that seems to be supported by Raman scattering measurements.

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“…It has also been demonstrated that magnetic anisotropy in magnetocaloric materials results in the rotating magnetocaloric effect, which is believed to facilitate the implementation of magnetic cooling. 9 Additionally, uniaxial magnetic anisotropy has been shown to increase the stability of skyrmion lattice phases. [10][11][12][13][14] Finally, in the iron pnictide family of materials the antiferromagnetic and unconventional superconducting states show extreme sensitivity to strain.…”

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confidence: 99%

Versatile strain-tuning of modulated long-period magnetic structures

Fobes

Luo

León-Brito

et al. 2017

Applied Physics Letters

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We report a detailed small-angle neutron scattering (SANS) study of the skyrmion lattice phase of MnSi under compressive and tensile strain. In particular, we demonstrate that tensile strain applied in the skyrmion lattice plane, perpendicular to the magnetic field, acts to destabilize the skyrmion lattice phase. This experiment was enabled by our development of a versatile strain cell, unique in its ability to select the application of either tensile or compressive strain in-situ by using two independent helium-actuated copper pressure transducers, whose design has been optimized for magnetic SANS on modulated long-period magnetic structures and vortex lattices, and is compact enough to fit in common sample environments, such as cryostats and superconducting magnets.Modulated long-period magnetic structures incommensurate to the underlying crystal structure have been demonstrated to be at the heart of a wide range of phenomena in solid-state physics such as the magnetoelectric coupling in multiferroic materials, 1 the magnetocaloric effect, 2 , the emergence of topologically-stabilized magnetic defects such as solitons 3 and skyrmions, 4 and unconventional superconductivity. In the latter case, long-period magnetic arrangements arise in two distinct forms, namely the underlying long-range ordered antiferromagnetic state whose critical fluctuations are believed to mediate unconventional superconductivity, 5 and the vortex lattice that forms in type-II superconductors, 6 which in some cases are intimately coupled to one another. 7 This makes long-period magnetic structures relevant for applications ranging from solid-state cooling to energy-applications to data storage and spintronics.Strain frequently represents an important tuning parameter in the optimization of the desired material response related to these phenomena. For example, in multiferroic materials, the ferroelectric polarization is strongly coupled to the underlying crystal structure, which can be tuned by strain, and will affect the magnetization via magnetostriction. 8 Likewise, uniaxial strain can be utilized to alter magnetic exchange integral overlap along a specific direction, and thus introduce or enhance magnetic anisotropy. It has also been demonstrated that magnetic anisotropy in magnetocaloric materials results in the rotating magnetocaloric effect, which is believed to facilitate the implementation of magnetic cooling. 9 Additionally, uniaxial magnetic anisotropy has been shown to increase the stability of skyrmion lattice phases. 10-14 Finally, in the iron pnictide family of materials the antiferromagnetic and unconventional superconducting states show extreme sensitivity to strain. 15 Small-angle neutron scattering (SANS) has proven itself to be one of the most powerful probes to study relevant microscopic parameters of modulated long-period magnetic structures, such as the order parameter and the period, and is a crucial tool for the study of superconducting vortex lattices. 6 However, most available insitu strain application options f...

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Giant Rotating Magnetocaloric Effect in the Region of Spin-Reorientation Transition in theNdCo5Single Crystal

Cited by 123 publications

References 16 publications

Magnetocaloric materials: The search for new systems

Magnetocaloric materials: The search for new systems

Analysis of the Anisotropic Magnetocaloric Effect in RMn2O5 Single Crystals

Versatile strain-tuning of modulated long-period magnetic structures

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