Chiral charge pumping in graphene deposited on a magnetic insulator
Journal article, 2017
We demonstrate experimentally that a sizable chiral charge pumping can be achieved at room temperature in graphene/yttrium iron garnet (YIG) bilayer systems. The effect, which cannot be attributed to the ordinary spin pumping, reveals itself in the creation of a dc electric field/voltage in graphene as a response to the dynamic magnetic excitations (spin waves) in an adjacent out-of-plane magnetized YIG film. We show that the induced voltage changes its sign when the orientation of the static magnetization is reversed, clearly indicating the broken mirror reflection symmetry about the planes normal to the graphene/YIG interface. The strength of effect shows a nonmonotonous dependence on the spin-wave frequency, in agreement with the proposed theoretical model.
films
ferromagnetic metal
magnons
Author
M. Evelt
University of Münster
H. Ochoa
University of California
O. Dzyapko
University of Münster
V. E. Demidov
University of Münster
Avgust Yurgens
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Jie Sun
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
Y. Tserkovnyak
University of California
V. Bessonov
Russian Academy of Sciences
A. B. Rinkevich
Russian Academy of Sciences
S. O. Demokritov
Russian Academy of Sciences
University of Münster
Physical Review B
24699950 (ISSN) 24699969 (eISSN)
Vol. 95 2 024408Areas of Advance
Information and Communication Technology
Nanoscience and Nanotechnology
Driving Forces
Sustainable development
Subject Categories (SSIF 2011)
Physical Sciences
Nano Technology
Condensed Matter Physics
Roots
Basic sciences
Infrastructure
Nanofabrication Laboratory
DOI
10.1103/PhysRevB.95.024408