Comparison of spin-orbit torques and spin pumping across NiFe/Pt and NiFe/Cu/Pt interfaces

By T. Nan, S. Emori, C. Boone, Xinjun Wang, Trevor M. Oxholm, John G. Jones, B. Howe, G. Brown, Nian Xiang Sun. 2015

156 citations recorded by the source corpus.

We experimentally investigate spin-orbit torques and spin pumping in NiFe/Pt bilayers with direct and interrupted interfaces. The dampinglike and fieldlike torques are simultaneously measured with spin-torque ferromagnetic resonance tuned by a dc-bias current, whereas spin pumping is measured electrically through the inverse spin-Hall effect using a microwave cavity. Insertion of an atomically thin Cu dusting layer at the interface reduces the dampinglike torque, fieldlike torque, and spin pumping by nearly the same factor of $\ensuremath{\approx}1.4$. This finding confirms that the observed spin-orbit torques predominantly arise from diffusive transport of spin current generated by the spin-Hall effect. We also find that spin-current scattering at the NiFe/Pt interface contributes to additional enhancement in magnetization damping that is distinct from spin pumping.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/6234735bc6991db5fa4100e07cf1f7a64938b1cc

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Pietro Gambardella
2. J. Sinova
3. T. Jungwirth
4. A. Manchon
5. I. Miron
6. Kevin Garello
7. A. Thiaville
8. J. Železný

In Electrical and Electronic Engineering

1. J. Sinova
2. A. Manchon
3. T. Jungwirth
4. A. Thiaville
5. Kevin Garello
6. Pietro Gambardella
7. I. Miron
8. J. Železný

Citations in the corpus

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “The latter effect is evident when considering that the SOTs change by as much as 50 % for a Cu spacer thickness of the order of 1 nm (Fan et al., 2014a; Nan et al., 2015), which is two orders of magnitude smaller than the spin diffusion length in Cu.”