Published January 19, 2015 | Version v1
Journal article Metadata-only

Temperature dependent low-field measurements of the magnetocaloric ΔT with sub-mK resolution in small volume and thin film samples

Creators

  • 1. Arbeitsgruppe Spektroskopie der kondensierten Materie, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
  • 2. Institut für Materialwissenschaft, TU Darmstadt, 64287 Darmstadt (Germany)
  • 3. Institut für Werkstoffe, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum (Germany)
  • 4. Materials Research Department, Ruhr-Universität Bochum, 44780 Bochum (Germany)

Description

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 Hext at the ΔT peak maximum, contrary to earlier predictions. An analytic expression is derived that interpolates between the Hext2-behavior at low and the well-known Hext2/3-behavior at high fields

Additional details

Identifiers

DOI
10.1063/1.4906426;

Publishing Information

Journal Title
Applied Physics Letters
Journal Volume
106
Journal Issue
3
Journal Page Range
p. 032408-032408.4
ISSN
0003-6951
CODEN
APPLAB

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46121037
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Descriptors DEI
GADOLINIUM; MAGNETIC PROPERTIES; RESOLUTION; TEMPERATURE DEPENDENCE; THERMAL RADIATION; THERMODYNAMIC PROPERTIES; THIN FILMS
Descriptors DEC
ELECTROMAGNETIC RADIATION; ELEMENTS; FILMS; METALS; PHYSICAL PROPERTIES; RADIATIONS; RARE EARTHS

Optional Information

Notes
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