Spin Currents in Ferromagnet / Normal Metal Hybrids
Event details
| Date | 29.11.2013 |
| Hour | 14:15 |
| Speaker | Dr. Sebastian Goennenwein, Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany |
| Location | |
| Category | Conferences - Seminars |
A pure spin current – i.e., the directed flow of spin angular momentum – is a fascinating manifestation of spin physics in the solid state. In ferromagnet/normal metal hybrid bilayers, pure spin currents can be generated, e.g., by means of spin pumping [1], or via the application of thermal gradients in the so-called spin Seebeck effect [2]. An elegant scheme for detecting spin currents relies on the inverse spin Hall effect: because of spin-orbit coupling, a spin current also induces a charge current, which then can be detected using conventional electronics [1,2].
In the talk, I will introduce and compare our recent experimental investigations of spin current-related phenomena in ferromagnet/normal metal hybrid devices [3-6]. Our results show that spin current generation is possible from both electrically conductive as well as electrically insulating ferromagnets (so-called ferromagnetic insulators). I will address the spatially resolved spin Seebeck effect experiments which we have performed in ferro¬¬magnetic insulator/normal metal thin film hybrid structures, and discuss a novel magneto-resistance effect arising from the interplay between spin and charge currents in these structures.
References:
[1] O. Mosendz et al., Phys. Rev. Lett. 104, 046601 (2010).
[2] K. Uchida et al., Nature Mater. 9, 894 (2010).
[3] F. D. Czeschka et al., Phys. Rev. Lett. 107, 046601 (2011).
[4] M. Weiler et al., Phys. Rev. Lett. 108, 106602 (2012).
[5] H. Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013).
[6] M. Weiler et al., Phys. Rev. Lett. 111, 176601 (2013).
In the talk, I will introduce and compare our recent experimental investigations of spin current-related phenomena in ferromagnet/normal metal hybrid devices [3-6]. Our results show that spin current generation is possible from both electrically conductive as well as electrically insulating ferromagnets (so-called ferromagnetic insulators). I will address the spatially resolved spin Seebeck effect experiments which we have performed in ferro¬¬magnetic insulator/normal metal thin film hybrid structures, and discuss a novel magneto-resistance effect arising from the interplay between spin and charge currents in these structures.
References:
[1] O. Mosendz et al., Phys. Rev. Lett. 104, 046601 (2010).
[2] K. Uchida et al., Nature Mater. 9, 894 (2010).
[3] F. D. Czeschka et al., Phys. Rev. Lett. 107, 046601 (2011).
[4] M. Weiler et al., Phys. Rev. Lett. 108, 106602 (2012).
[5] H. Nakayama et al., Phys. Rev. Lett. 110, 206601 (2013).
[6] M. Weiler et al., Phys. Rev. Lett. 111, 176601 (2013).
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)
Contact
- Arnaud Magrez