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)
doi: 10.1103/PhysRevApplied.5.024013
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Gottschall, T. ; Skokov, K. P. ; Scheibel, F. ; Acet, M. ; Zavareh, M. Ghorbani ; Skourski, Y. ; Wosnitza, J. ; Farle, M. ; Gutfleisch, O. |
| Art des Eintrags: | Bibliographie |
| Titel: | Dynamical Effects of the Martensitic Transition in Magnetocaloric Heusler Alloys from DirectΔTadMeasurements under Different Magnetic-Field-Sweep Rates |
| Sprache: | Englisch |
| Publikationsjahr: | 26 Februar 2016 |
| Verlag: | AMER PHYSICAL SOC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Applied |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1103/PhysRevApplied.5.024013 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 11 Mai 2016 12:52 |
| Letzte Änderung: | 11 Mai 2016 12:52 |
| PPN: | |
| Sponsoren: | 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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