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Title: Magnetothermoelectric figure of merit of Co/Cu multilayers

The switching of the magnetic configuration of giant magnetoresistance multilayers not only changes the electrical and thermal conductivities but also the thermopower. We study the magnetotransport and the magnetothermoelectric properties of Co/Cu multilayer devices in a lateral thermal gradient. The Seebeck coefficient reaches values up to −18 μV/K at room temperature and shows a magnetic field dependence up to 28.6% upon spin reversal. In combination with thermal conductivity data of the same Co/Cu stack, we find a magnetothermoelectric figure of merit of up to 65%. Furthermore, a magneto-power factor of up to 110% is derived.
Authors:
; ; ;  [1] ;  [2] ; ;  [3] ; ; ;  [4]
  1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig (Germany)
  2. International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, 4715-330 Braga (Portugal)
  3. Fakultät für Physik, Universität Bielefeld, Postfach 100131, D-33501 Bielefeld (Germany)
  4. Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22283054
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT; COPPER; INTERFACES; LAYERS; MAGNETIC FIELDS; MAGNETORESISTANCE; POWER FACTOR; SPIN; TEMPERATURE GRADIENTS; TEMPERATURE RANGE 0273-0400 K; THERMAL CONDUCTIVITY; THERMOELECTRIC PROPERTIES