Thermal transport and domain structure

• Applicants: Professor Dr. Christian Hemker-Heß; Professor Dr. Rudolf Schäfer
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2011 to 2018
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 198132664

• Final Report Year: 2019

Final Report Abstract

The main of this project was to gain an understanding of spin-caloric transport phenomena, mostly the spin Seebeck effect with a particular focus on possible parasitic effects and the relevance of ferromagnetic domains. Our results suggest that the previously reported signatures of the spin Seebeck effect can be explained by conventional planar and anomalous Nernst effect responses in the presence of inevitable parasitic temperature gradients. This major finding of the project lead to readjusting its focus to address general transport phenomena of Heusler materials and to advance quantitative Kerr microscopy.

Publications

• Half-metallic ferromagnetism with unexpectedly small spin splitting in the Heusler compound Co2FeSi, Phys. Rev. Lett. 110, 066601 (2013)
  D. Bombor, C. G. F. Blum, O. Volkonskiy, S. Rodan, S. Wurmehl, C. Hess, B. Büchner
  
• Spin density wave order and fluctuations in Mn3Si: a transport study, Phys. Rev. B 90, 134411 (2014)
  F. Steckel, S. Rodan, R. Hermann, C. G. F. Blum, S. Wurmehl, B. Büchner, C. Hess
  
• Thermoelectric effects and magnetic anisotropy of Ga1-xMnxAs thin films, Phys. Rev. B 90, 104423 (2014)
  I. V. Soldatov, N. Panarina, C. Hess, L. Schultz, R. Schäfer
  
• Advances in quantitative Kerr microscopy, Phys. Rev. B 95, 014426 (2017)
  I.V. Soldatov and R. Schäfer
  
• Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling, Physics Reports (2019)
  C. Hess