Waske, A. ; Hermann, H. ; Mattern, N. ; Skokov, K. ; Gutfleisch, O. ; Eckert, J. (2012)
Magnetocaloric effect of an Fe-based metallic glass compared to benchmark gadolinium.
In: Journal of Applied Physics, 112 (12)
doi: 10.1063/1.4770468
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report on the magnetocaloric effect in an Fe-based metallic glass (Fe80B12Nb8) as compared to the benchmark material gadolinium. From temperature-dependent magnetization measurements, the magnetic entropy change was calculated using the thermodynamic Maxwell relations. The adiabatic temperature change was directly measured for both materials using a dedicated setup. An analysis of the magnetic transition in amorphous Fe80B12Nb8 and crystalline gadolinium using a mean field and a phenomenological model was carried out. It was shown that both materials, in particular crystalline gadolinium, which does not possess structural disorder but merely a fluctuation of the exchange integral, can be described using the Handrich model for the magnetic transition of disordered materials. Furthermore, the Landau theory of second-order phase transitions quantitatively describes the magnetic entropy change and its dependence on the applied field very well for both materials with different definitions of disorder.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Waske, A. ; Hermann, H. ; Mattern, N. ; Skokov, K. ; Gutfleisch, O. ; Eckert, J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Magnetocaloric effect of an Fe-based metallic glass compared to benchmark gadolinium |
| Sprache: | Englisch |
| Publikationsjahr: | 2012 |
| Verlag: | American Institute of Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 112 |
| (Heft-)Nummer: | 12 |
| DOI: | 10.1063/1.4770468 |
| Kurzbeschreibung (Abstract): | We report on the magnetocaloric effect in an Fe-based metallic glass (Fe80B12Nb8) as compared to the benchmark material gadolinium. From temperature-dependent magnetization measurements, the magnetic entropy change was calculated using the thermodynamic Maxwell relations. The adiabatic temperature change was directly measured for both materials using a dedicated setup. An analysis of the magnetic transition in amorphous Fe80B12Nb8 and crystalline gadolinium using a mean field and a phenomenological model was carried out. It was shown that both materials, in particular crystalline gadolinium, which does not possess structural disorder but merely a fluctuation of the exchange integral, can be described using the Handrich model for the magnetic transition of disordered materials. Furthermore, the Landau theory of second-order phase transitions quantitatively describes the magnetic entropy change and its dependence on the applied field very well for both materials with different definitions of disorder. |
| Freie Schlagworte: | amorphous state, boron alloys, entropy, exchange interactions (electron), iron alloys, Landau levels, magnetic transitions, magnetisation reversal, magnetocaloric effects, metallic glasses, niobium alloys, thermodynamics |
| 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: | 25 Apr 2013 09:13 |
| Letzte Änderung: | 25 Apr 2013 09:13 |
| PPN: | |
| Sponsoren: | This work was funded by the Leibniz Society. |
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