Magnetocaloric effect in the low hysteresis Ni-Mn-In metamagnetic shape-memory Heusler alloy

Stern‐Taulats, Enric; Castillo-Villa, Pedro O.; Mañosa, Lluı́s; Frontera, C.; Pramanick, S.; Majumdar, S.; Planes, Antoni

doi:10.1063/1.4874935

Cited by 92 publications

(49 citation statements)

References 38 publications

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“…Isothermal DSC with magnetic field enables direct determination of the magnetic field-induced entropy change and it is a unique tool to study the reproducibil- ity of the magnetocaloric effect upon field cycling 38,39 . We have performed calorimetric measurements at selected values of the temperature while magnetic field was swept.…”

Section: Discussionmentioning

confidence: 99%

Barocaloric and magnetocaloric effects inFe49Rh51

et al. 2014

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We report on calorimetry under applied hydrostatic pressure and magnetic field at the antiferromagnetic (AFM)-ferromagnetic (FM) transition of Fe 49 Rh 51 . Results demonstrate the existence of a giant barocaloric effect in this alloy, a new functional property that adds to the magnetocaloric and elastocaloric effects previously reported for this alloy. All caloric effects originate from the AFM/FM transition which encompasses changes in volume, magnetization and entropy.The strong sensitivity of the transition temperatures to both hydrostatic pressure and magnetic field confers to this alloy outstanding values for the barocaloric and magnetocaloric strengths (|∆S|/∆p ∼ 12 J kg −1 K −1 kbar −1 and |∆S|/µ 0 ∆H ∼ 12 J kg −1 K −1 T −1 ). Both barocaloric and magnetocaloric effects have been found to be reproducible upon pressure and magnetic field cycling. Such a good reproducibility and the large caloric strengths make Fe-Rh alloys particularly appealing for solid-state cooling technologies at weak external stimuli.

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Section: Discussionmentioning

confidence: 99%

Barocaloric and magnetocaloric effects inFe49Rh51

et al. 2014

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“…There is no structural phase change but rather a magnetic transition over the measured temperature range, suggesting that the unaccounted-for change in vibrational entropy arises from magnetostrictive effects and/or magnetophonon coupling. The 0.22 (atom) −1 of anomalous entropy change is ~20% greater than the reversible entropy change that has been measured across the martensitic FOPT in similar MMSMAs [17,[26][27][28][29], presenting this crystal as a possible candidate for a SOFT-based magnetocaloric material. To explore more directly the relationship between the lattice vibrations and the magnetic structure, we performed temperature-dependent triple-axis inelastic neutron scattering measurements of key phonons across the magnetic phase transition.…”

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Lattice vibrations boost demagnetization entropy in a shape-memory alloy

et al. 2015

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Magnetocaloric (MC) materials present an avenue for chemical-free, solid state refrigeration through cooling via adiabatic demagnetization. We have used inelastic neutron scattering to measure the lattice dynamics in the MC material Ni45Co5Mn36.6In13.4. Upon heating across the Curie Temperature (TC), the material exhibits an anomalous increase in phonon entropy of 0.22 ± 0.04 /atom, which is ten times larger than expected from conventional thermal expansion. This transition is accompanied by an abrupt softening of the transverse optic phonon. We present first-principle calculations showing a strong coupling between lattice distortions and magnetic excitations.PACS numbers: 78.70. Nx, 75.30.Sg, 65.40.gd, 63.20.kk The coupling between magnetism and lattice excitations has been a recent topic of interest due to its importance in several solid-state systems, such as influencing decoherence in quantum magnets [1] and inducing a spin-Peierls transition in CuGeO 3 [2,3] and ZnCr 2 O 4 [4]. Studies of magnetoelastic materials have focused on metamagnetic shape memory alloys (MMSMA), which are able to reversibly deform with strains of up to ~6% [5,6] via a structural first-order phase transition (FOPT) [7][8][9]. The FOPT allows the alloy to function as magnetocaloric (MC) material, in which an adiabatic change in magnetization of the MMSMA causes an increase in its entropy, thus lowering its temperature [9][10][11][12]. While the change in entropy can be quite large, the FOPT is often accompanied by thermal and/or magnetic hysteresis, which limits the material's long term cycling efficiency. In addition, materials requiring a magnetic field of more than 2 T to induce the FOPT are not feasible for use in any magnetic refrigerator using permanent magnets [13,14].The paramagnetic-to-ferromagnetic secondorder phase transition (SOPT) offers a means to extract heat from a magnetic material using weaker applied magnetic fields and without hysteresis. This SOPT is present in any magnetic material at its Curie temperature ( ), but the change in entropy is typically significantly less than across the FOPT.In this letter, we quantify the phonon entropy and the magnon-phonon coupling in Ni45Co5Mn50-xInx (x=13.4) near the austenite using neutron scattering [15]. When annealed at temperatures below 900K, this compound forms a Huesler L21 structure that is stable down to the martensitic transition temperature , with Mn atoms occupying the 4a positions, Mn1-x/25Inx/25 the 4b, and Ni0.9Co0.1 the 8c positions (Wyckoff notation) [16]. The composition of the crystal puts it at a morphotropic phase boundary; decreasing x from 13.4 to 13.3 leads to an increase in by ~100K [17]. Ab initio calculations of similar compounds point to magnetic frustration as a possible explanation of the morphotropic phase boundary [18][19][20][21]. The magnetic exchange integral for nearest-neighbors Mn-Mn in the 4a and 4b positions -i.e. aligned along [100] -is predicted to be a large negative value (antiferromagnetic). Such an interaction competes ...

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“…In this alloys, unlike in the conventional FSMAs, shape recovery can be obtained by the magnetic field induced reverse transformation. This metamagnetic transformation occurs from martensite to the ferromagnetic parent phase under external magnetic field [2,3]. Until now several alloy systems have been developed as MMSMAs e.g.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Structure of the Ni-Co-Mn-In Alloys with the Boron Addition

et al. 2017

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Series of Ni45.5−xCo4.5Mn36.6In13.4Bx (at.%, x = 0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys were examined in terms of the magnetic properties, structure and transition temperatures. Depending on the boron concentration single or two phase alloys microstructures were observed. Additionally, the martensitic transformation temperatures decreases with the boron addition. Magnetic-field induced transformation occurs for the alloys with the boron addition up to 0.1 at.%. For alloys with 0.5 and 1.0 at.% of B transformation is hindered.

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Magnetocaloric effect in the low hysteresis Ni-Mn-In metamagnetic shape-memory Heusler alloy

Cited by 92 publications

References 38 publications

Barocaloric and magnetocaloric effects inFe49Rh51

Barocaloric and magnetocaloric effects inFe49Rh51

Lattice vibrations boost demagnetization entropy in a shape-memory alloy

Magnetic Properties and Structure of the Ni-Co-Mn-In Alloys with the Boron Addition

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