Hysteresis effects in the inverse magnetocaloric effect in martensitic Ni-Mn-In and Ni-Mn-Sn

Titov, Ivan; Acet, M.; Farle, Michael; González-Alonso, David; Mañosa, Lluı́s; Planes, Antoni; Krenke, Thorsten

doi:10.1063/1.4757425

Cited by 89 publications

(55 citation statements)

References 14 publications

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“…In practical magnetocaloric cooling applications, permanent magnets are typically used due to their small size and low cost48, but the magnitude of their magnetic remanence limits their field generation to nearly 2 T. This is normally insufficient to complete the stress-free martensite to austenite transformation in NiCoMnIn MMSMAs49. Therefore, constant mechanical stress–field ramping (CS-FR) and varying stress-field ramping (VS-FR) was performed on MMSMAs to induce the complete martensite to austenite to martensite transformation cycles and to determine if mechanical loading can, in fact, decrease the required magnetic field levels.…”

Section: Using Multi-field Loading To Minimize Magnetic Field Requirementioning

confidence: 99%

Reversible Martensitic Transformation under Low Magnetic Fields in Magnetic Shape Memory Alloys

Bruno

Wang

Караман

et al. 2017

Sci Rep

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Magnetic field-induced, reversible martensitic transformations in NiCoMnIn meta-magnetic shape memory alloys were studied under constant and varying mechanical loads to understand the role of coupled magneto-mechanical loading on the transformation characteristics and the magnetic field levels required for reversible phase transformations. The samples with two distinct microstructures were tested along the [001] austenite crystallographic direction using a custom designed magneto-thermo-mechanical characterization device while carefully controlling their thermodynamic states through isothermal constant stress and stress-varying magnetic field ramping. Measurements revealed that these meta-magnetic shape memory alloys were capable of generating entropy changes of 14 J kg−1 K−1 or 22 J kg −1 K−1, and corresponding magnetocaloric cooling with reversible shape changes as high as 5.6% under only 1.3 T, or 3 T applied magnetic fields, respectively. Thus, we demonstrate that this alloy is suitable as an active component in near room temperature devices, such as magnetocaloric regenerators, and that the field levels generated by permanent magnets can be sufficient to completely transform the alloy between its martensitic and austenitic states if the loading sequence developed, herein, is employed.

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Section: Using Multi-field Loading To Minimize Magnetic Field Requirementioning

confidence: 99%

Reversible Martensitic Transformation under Low Magnetic Fields in Magnetic Shape Memory Alloys

Bruno

Wang

Караман

et al. 2017

Sci Rep

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“…Henceforth, as the magnetic field is reduced again, we first observe a conventional MCE due to the change of the magnetic entropy in the ferromagnetic austenitic phase and the sample continues to cool down further. 6,10,11 As the field continues to decrease, the sample transforms back to the martensitic phase at the critical field of the field-induced martensitic transition leading to a negative change of the structural entropy. As a consequence the sample starts to heat up again, ∆T str ad > 0.…”

Section: 2mentioning

confidence: 99%

Direct measurements of the magnetocaloric effect in pulsed magnetic fields: The example of the Heusler alloy Ni50Mn35In15

Zavareh

Mejía

Nayak

et al. 2015

Applied Physics Letters

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We have studied the magnetocaloric effect (MCE) in the shape-memory Heusler alloy Ni 50 Mn 35 In 15 by direct measurements in pulsed magnetic fields up to 6 and 20 T. The results in 6 T are compared with data obtained from heat-capacity experiments. We find a saturation of the inverse MCE, related to the first-order martensitic transition, with a maximum adiabatic temperature change of ∆T ad = −7 K at 250 K and a conventional field-dependent MCE near the second-order ferromagnetic transition in the austenitic phase. The pulsed magnetic field data allow for an analysis of the temperature response of the sample to the magnetic field on a time scale of ∼ 10 to 100 ms which is on the order of typical operation frequencies (10 to 100 Hz) of magnetocaloric cooling devices. Our results disclose that in shape-memory alloys the different contributions to the MCE and hysteresis effects around the martensitic transition have to be carefully considered for future cooling applications.PACS numbers: 75.30. Sg, 75.40.Cx, 75.60.Ej Recently, tremendous efforts have been made to find alternative technologies to replace the conventional gas compression/expansion technique for cooling applications. 1,2Higher efficiency cooling and environmental-friendly magnetic refrigeration based on the magnetocaloric effect (MCE) have initiated intensive research activity. Besides its practical application, MCE studies can give an extra insight in the properties of the magnetic phase transitions. Among the most promising materials, Heusler-type Ni-Mn-In magnetic shape-memory alloys are attractive candidates for both fundamental research and application. These alloys have been shown to exhibit diverse functional properties such as shape memory, 3,4 magnetic superelasticity, 5 magnetocaloric, 6 and barocaloric effect, 7 which originate from magnetoelastic couplings. Ni 50 Mn 35 In 15 exhibits on cooling a paramagnetic to ferromagnetic transition around 315 K, followed by a first-order structural transition from a cubic high-temperature phase to a low-temperature monoclinic phase around 246 K, the so-called martensitic transition. A conventional MCE is observed around the ferromagnetic transition in the austenitic phase. Here, an increase in the sample temperature is observed upon application of a magnetic field in adiabatic conditions. Additionally, an inverse MCE is present around the martensitic first-order transition leading to a decrease in the sample temperature with increasing field. Due to the first-order character of the latter transition, hysteresis losses and fatigue are critical issues on the search of suitable materials for magnetocaloric cooling devices. So far, most MCE studa) Electronic mail: Catalina.Salazar@cpfs.mpg.de ies have been done by calculating the isothermal entropy change, ∆S iso , based on indirect methods, however, for first-order phase transitions additional considerations should be applied.8 Direct measurements, besides giving the adiabatic temperature change, ∆T ad , which is one of the important parameters for m...

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“…35,[57][58][59] This instrument could give information about the reversibility of magnetic phase transitions as well.…”

Section: B Thermomagnetic Cyclesmentioning

confidence: 99%

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

Porcari

Buzzi²,

Cugini³

et al. 2013

Review of Scientific Instruments

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An experimental setup for the direct measurement of the magnetocaloric effect capable of simulating high frequency magnetothermal cycles on laboratory-scale samples is described. The study of the magnetocaloric properties of working materials under operative conditions is fundamental for the development of innovative devices. Frequency and time dependent characterization can provide essential information on intrinsic features such as magnetic field induced fatigue in materials undergoing first order magnetic phase transitions. A full characterization of the adiabatic temperature change performed for a sample of Gadolinium across its Curie transition shows the good agreement between our results and literature data and in-field differential scanning calorimetry. © 2013 AIP Publishing LLC. [http://dx

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Hysteresis effects in the inverse magnetocaloric effect in martensitic Ni-Mn-In and Ni-Mn-Sn

Cited by 89 publications

References 14 publications

Reversible Martensitic Transformation under Low Magnetic Fields in Magnetic Shape Memory Alloys

Reversible Martensitic Transformation under Low Magnetic Fields in Magnetic Shape Memory Alloys

Direct measurements of the magnetocaloric effect in pulsed magnetic fields: The example of the Heusler alloy Ni50Mn35In15

Direct magnetocaloric characterization and simulation of thermomagnetic cycles

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