Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 9: Spincaloric Transport (jointly with TT)

MA 9.2: Vortrag

Montag, 7. März 2016, 15:15–15:30, H31

A novel tool to investigate anisotropic effects in spin caloric measurements — •Oliver Reimer, Michel Bovender, Jan-Oliver Dreessen, Daniel Meier, Lars Helmich, Andreas Hütten, Jan-Michael Schmalhorst, Günter Reiss und Timo Kuschel — CSMD, Physics Department, Bielefeld University, Germany

In spin caloric measurements ∇ T acts as a driving force for spin currents. A ferromagnet exposed to ∇ T in an external magnetic field H^→ generates a spin current parallel to ∇ T (longitudinal spin Seebeck effect [1]) which can be detected in materials with high spin orbit coupling (e.g. Pt) by the inverse spin Hall effect. In paramagnets the spin Nernst effect is expected to cause a transverse spin current which can induce a spin torque transfer at the interface to a magnetic material. Thus, ∇ T could be used in combination with H^→ to create a spin Nernst effect based magnetothermopower similar to the current driven spin Hall magnetoresistance [2,3]. We introduce a new setup which allows the rotation of ∇ T in addition to varying T_base and Δ T. This talk gives an overview of the implementation of an infrared camera controlled rotation of ∇ T which combined with the rotation of H^→ enables the measurement of anisotropic spin caloric effects. The functionality of the setup is proven by planar Nernst effect measurements and compared to the results of D. Meier et al. [4].
[1] K. Uchida et al., Appl. Phys. Lett. 97, 172505 (2010)
[2] H. Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013)
[3] M. Althammer et al., Phys. Rev. B 87, 224401 (2013)
[4] D. Meier et al., Phys. Rev. B 88, 184425 (2013)