Gottschall, T. ; Skokov, K. P. ; Scheibel, F. ; Acet, M. ; Zavareh, M. Ghorbani ; Skourski, Y. ; Wosnitza, J. ; Farle, M. ; Gutfleisch, O. (2016):
Dynamical Effects of the Martensitic Transition in Magnetocaloric Heusler Alloys from DirectΔTadMeasurements under Different Magnetic-Field-Sweep Rates.
In: Physical Review Applied, 5 (2), AMER PHYSICAL SOC, ISSN 2331-7019,
[Article]
Abstract
Large magnetocaloric effects can be obtained in Ni-Mn-based Heusler alloys due to the magnetostructural transition between martensite and austenite. This phase transformation proceeds via nucleation and growth. By direct measurements of the adiabatic temperature change Delta T-ad using different magnetic-field-sweeping rates from 0.01 up to 1500 T s(-1), we study the dynamic behavior of the two Heusler compounds Ni50Mn35In15 and Ni45Mn37In13Co5 transforming near room temperature. From these experiments, we conclude that the nucleation process is rather slow in contrast to the relatively fast movement of the phase boundary between martensite and austenite. This is a limiting factor for cooling concepts operating at frequencies beyond 100 Hz. However, the dynamic effects of the transition are negligible in field rates typically used in magnetic refrigeration. These findings are essential considering the suitability of Heusler compounds for energy-efficient solid-state cooling.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Gottschall, T. ; Skokov, K. P. ; Scheibel, F. ; Acet, M. ; Zavareh, M. Ghorbani ; Skourski, Y. ; Wosnitza, J. ; Farle, M. ; Gutfleisch, O. |
| Title: | Dynamical Effects of the Martensitic Transition in Magnetocaloric Heusler Alloys from DirectΔTadMeasurements under Different Magnetic-Field-Sweep Rates |
| Language: | English |
| Abstract: | Large magnetocaloric effects can be obtained in Ni-Mn-based Heusler alloys due to the magnetostructural transition between martensite and austenite. This phase transformation proceeds via nucleation and growth. By direct measurements of the adiabatic temperature change Delta T-ad using different magnetic-field-sweeping rates from 0.01 up to 1500 T s(-1), we study the dynamic behavior of the two Heusler compounds Ni50Mn35In15 and Ni45Mn37In13Co5 transforming near room temperature. From these experiments, we conclude that the nucleation process is rather slow in contrast to the relatively fast movement of the phase boundary between martensite and austenite. This is a limiting factor for cooling concepts operating at frequencies beyond 100 Hz. However, the dynamic effects of the transition are negligible in field rates typically used in magnetic refrigeration. These findings are essential considering the suitability of Heusler compounds for energy-efficient solid-state cooling. |
| Journal or Publication Title: | Physical Review Applied |
| Volume of the journal: | 5 |
| Issue Number: | 2 |
| Publisher: | AMER PHYSICAL SOC |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Functional Materials 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 11 May 2016 12:52 |
| URL / URN: | http://dx.doi.org/10.1103/PhysRevApplied.5.024013 |
| Identification Number: | doi:10.1103/PhysRevApplied.5.024013 |
| PPN: | |
| Funders: | This work was supported by DFG (Grant No. SPP 1599) and by HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL). |
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