Dependence of the efficiency of spin Hall torque on the transparency of Pt/ferromagnetic layer interfaces

By C. Pai, Yongxi Ou, L. H. Vilela-Leão, D. Ralph, Robert A. Buhrman. 2014

342 citations recorded by the source corpus.

We report that spin current transport across Pt-ferromagnet (FM) interfaces is strongly dependent on the type and the thickness of the FM layer and on post-deposition processing protocols. By employing both harmonic voltage measurements and spin-torque ferromagnetic resonance measurements, we find that the efficiency of the Pt spin Hall effect in exerting a damping-like spin torque on the FM ranges from 0.10 under different interfacial conditions. We also show that the temperature dependence of the spin torque efficiencies for both the damping-like torque and field-like torque is dependent upon the details of the Pt-FM interface. The "internal" spin Hall angle of the Pt thin films used in this study, after taking the interfacial spin transmission factor into account, is estimated to be ~ 0.20. This suggests that a careful engineering of Pt-FM interfaces can improve the spin-Hall-torque efficiency of Pt-based spintronic devices.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/fccbb0d6de7b5d275d9ee8b3d447d1895e23ad41

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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 Materials Chemistry

1. J. Sinova
2. D. Ralph
3. Pietro Gambardella
4. A. Manchon
5. T. Jungwirth
6. T. Dietl

Citations in the corpus

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems (2018, background): “the field-like torque has a more erratic behavior depending on the type of ferromagnet and interface structure (Pai et al., 2015).”
• Highly Efficient Spin-Current Generation by the Spin Hall Effect in Au1−xPtx (2018, background): “This latter technique also does require a quite accurate determination of G⇅, which can be challenging to achieve, particularly if there is significant spin memory loss at the interface [16,18].”
• Electrical Detection of Magnetization Dynamics via Spin Rectification Effects (2016, background): “a dispersive contribution, unlike the case of pure spin Hall induced spin torque, and care must be taken to separate the effects [219, 223].”
• Spin-Orbit Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys (2016, background): “due to the relatively smaller spin-mixing conductance at the Ta/CoTb interface [35].”
• Interface-Induced Phenomena in Magnetism (2016, neutral): “interface between a spin-generating material and the magnetic layer are just beginning to be investigated [Zhang et al., 2015c; Pai et al., 2015].”