Characterization of thermomagnetic effects in thin films
Dr. Zsolt Gercsi
Trinity College Dublin.
Date & Time: 10:30 - 11:30, September 2nd (Wed), 2015.
Place: 8F Medium Seminar Room(#811-812), Sengen
Abstract:
Thermoelectric effects are known as powerful tools for devices as well as for material characterization for nearly 200 years. Accordingly, large databases of bulk material parameters, such as Seebeck- and Nernst coefficients are available today. The emerging field of spincaloritronics [1], which focuses on the interaction of charge and spin currents with heat currents in solids, shows the necessity for investigating these parameters in thin films. However, the lack of accurate temperature measurements in thin films render the direct comparison of the spin dependent Seebeck effect (SSE) [2] impossible. In my talk, I will describe a recently proposed calorimetric approach by Sola et al. [3] to evaluate out-of-plane thermal gradients. Additionally, an in-plane configuration for in-situ Nernst and Hall measurements will also be discussed. Examples for such measurements based on uniaxial Mn2RuxGa (MRG) films, which are prototypical examples of zero-moment ferrimagnets with high spin polarization [4] and large spontaneous Hall effect [5] will be presented.
[1] Bauer, G. E. W., Saitoh, E. & van Wees, B. J., Nat Mater 11, 391-399 (2012).
[2] Uchida, K. et al. Appl. Phys. Lett. 97, 172505 (2010).
[3] A. Sola et al. J. Appl. Phys. 117, 17C510 (2015).
[4] H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda and J. M. D. Coey, Phys. Rev. Lett. 112, 027201 (2014).
[5] T Naganivetha, Y.-C. Lau, D. Betto, K. Borisov, J.M.D. Coey, P. Stamenov and K. Rode, Appl. Phys, Lett., 106, 122402 (2015).
[1] Bauer, G. E. W., Saitoh, E. & van Wees, B. J., Nat Mater 11, 391-399 (2012).
[2] Uchida, K. et al. Appl. Phys. Lett. 97, 172505 (2010).
[3] A. Sola et al. J. Appl. Phys. 117, 17C510 (2015).
[4] H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda and J. M. D. Coey, Phys. Rev. Lett. 112, 027201 (2014).
[5] T Naganivetha, Y.-C. Lau, D. Betto, K. Borisov, J.M.D. Coey, P. Stamenov and K. Rode, Appl. Phys, Lett., 106, 122402 (2015).