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Magnetocaloric effect of an Fe-based metallic glass compared to benchmark gadolinium

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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