Spin-transfer and exchange torques in ferromagnetic superconductors.
We consider how superconducting correlations influence spin-transfer torques in ferromagnetic superconductors. It is demonstrated that there is a novel torque arising from particle-hole interference that depends on the U(1) phase associated with the superconducting order parameter. We also show that there is an equilibrium exchange torque between two ferromagnetic superconductors in contact via a normal metal mediated by Andreev states. The latter equilibrium magnetic torque is also sensitive to spin-resolved phase differences in the superconducting order parameters as well as to an externally applied phase difference.
Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Jacob
J
Linder
Arne
A
Brataas
Zahra
Z
Shomali
Malek
M
Zareyan