Döntgen, J. ; Rudolph, J. ; Gottschall, T. ; Gutfleisch, O. ; Salomon, S. ; Ludwig, A. ; Hägele, D. (2015)
Temperature dependent low-field measurements of the magnetocaloric ΔT with sub-mK resolution in small volume and thin film samples.
In: Applied Physics Letters, 106 (3)
doi: 10.1063/1.4906426
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We present temperature dependent ΔT measurements of the magnetocaloric effect in a thin film sample of Gd, employing magnetomodulation and detection of thermal radiation. A bulk sample of the metamagnetic material LaFe11.05Co0.91Si1.04 shows a strong broadening of the ΔT peak for increasing field amplitudes between 4 and 45 mT. Bulk Gd in comparison shows only a weak broadening. All investigated samples exhibit a clear quadratic dependence of ΔT on the external field H ext at the ΔT peak maximum, contrary to earlier predictions. An analytic expression is derived that interpolates between the H2ext -behavior at low and the well-known H2/3ext -behavior at high fields.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Döntgen, J. ; Rudolph, J. ; Gottschall, T. ; Gutfleisch, O. ; Salomon, S. ; Ludwig, A. ; Hägele, D. |
| Art des Eintrags: | Bibliographie |
| Titel: | Temperature dependent low-field measurements of the magnetocaloric ΔT with sub-mK resolution in small volume and thin film samples |
| Sprache: | Englisch |
| Publikationsjahr: | 21 Januar 2015 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 3 |
| DOI: | 10.1063/1.4906426 |
| Kurzbeschreibung (Abstract): | We present temperature dependent ΔT measurements of the magnetocaloric effect in a thin film sample of Gd, employing magnetomodulation and detection of thermal radiation. A bulk sample of the metamagnetic material LaFe11.05Co0.91Si1.04 shows a strong broadening of the ΔT peak for increasing field amplitudes between 4 and 45 mT. Bulk Gd in comparison shows only a weak broadening. All investigated samples exhibit a clear quadratic dependence of ΔT on the external field H ext at the ΔT peak maximum, contrary to earlier predictions. An analytic expression is derived that interpolates between the H2ext -behavior at low and the well-known H2/3ext -behavior at high fields. |
| Freie Schlagworte: | Temperature measurement, Magnetic films, Magnetic fields, Chemical interdiffusion, Magnetic materials |
| 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: | 10 Feb 2015 09:34 |
| Letzte Änderung: | 10 Feb 2015 09:34 |
| PPN: | |
| Sponsoren: | We gratefully acknowledge financial support by the German Science Foundation (DFG priority program 1599 “Ferroic Cooling”). |
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