Thermomagnetic properties of single crystal Ni54Fe19Ga27 Heusler alloys
Thermomagnetic properties of off-stoichiometric Ni54Fe19Ga27 Heusler alloys are measured by a laboratory differential scanning calorimeter employing Peltier cells and working under magnetic field. We find that the transition temperature from martensite (M) to austenite (A) is TM→A=5.3 °C and from A...
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Veröffentlicht in: | Journal of applied physics 2009-04, Vol.105 (7) |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Thermomagnetic properties of off-stoichiometric Ni54Fe19Ga27 Heusler alloys are measured by a laboratory differential scanning calorimeter employing Peltier cells and working under magnetic field. We find that the transition temperature from martensite (M) to austenite (A) is TM→A=5.3 °C and from A to M is TA→M=0.2 °C with a thermal hysteresis of 5.1 °C. The entropy change associated with the first order transformation is 15 J kg−1 K−1. By direct measurement and by Clausius–Clapeyron equation, we find that the effect of the magnetic field is a shift of transition temperatures of 0.2 K T−1. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.3073838 |