C. Swindells
Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism
Swindells, C.; Głowiński, H.; Choi, Y.; Haskel, D.; Michałowski, P.P.; Hase, T.; Stobiecki, F.; Kuświk, P.; Atkinson, D.
Authors
H. Głowiński
Y. Choi
D. Haskel
P.P. Michałowski
T. Hase
F. Stobiecki
P. Kuświk
Professor Del Atkinson del.atkinson@durham.ac.uk
Professor
Abstract
Damping and spin transport in spintronic multilayered systems continues to be a topic of active research. The enhancement of damping in ferromagnet (FM)/spacer layer (SL)/heavy-metal (HM) thin-film systems was studied for Co 25 Fe 75 / SL / Pt with a nonmagnetic (NM) SL of either Au or Cu with variable thickness, in order to understand the correlation with proximity-induced magnetism (PIM) in the HM. Structural, PIM and magnetic damping measurements were undertaken on the same samples. Specifically, secondary ion mass spectroscopy, element specific x-ray magnetic reflectivity and x-ray magnetic circular dichroism at the Pt and Au L 3 edges, and ferromagnetic resonance methods were used. With increasing thickness of a Cu or Au SL directly between the FM and the Pt layer, the Pt PIM and the damping both fall rapidly, with a relationship between damping and PIM that depends on the SL material. The PIM observed in the Au layer showed a complex dependence on the layer thickness, suggesting some hybridization with the Pt. The role of the number and location of interfaces on the damping was demonstrated with the addition of a SL within the Pt layer, which showed that the specific details of the NM/HM interface also affects the damping. The insertion of a Cu SL within the Pt showed a measurable increase in the overall enhancement of the damping while the insertion of a Au SL into Pt had almost no effect on the damping. Together these results demonstrate the role of both PIM and of additional interfaces in the enhancement of damping in FM/HM systems, which is not fully accounted for by existing theory.
Citation
Swindells, C., Głowiński, H., Choi, Y., Haskel, D., Michałowski, P., Hase, T., Stobiecki, F., Kuświk, P., & Atkinson, D. (2022). Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism. Physical Review B, 105(9), Article 094433. https://doi.org/10.1103/physrevb.105.094433
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 15, 2022 |
Online Publication Date | Mar 25, 2022 |
Publication Date | Mar 1, 2022 |
Deposit Date | Mar 30, 2022 |
Publicly Available Date | Mar 30, 2022 |
Journal | Physical Review B |
Print ISSN | 2469-9950 |
Electronic ISSN | 2469-9969 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 105 |
Issue | 9 |
Article Number | 094433 |
DOI | https://doi.org/10.1103/physrevb.105.094433 |
Public URL | https://durham-repository.worktribe.com/output/1210612 |
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Copyright Statement
Reprinted with permission from the American Physical Society: Swindells, C., Głowiński, H., Choi, Y., Haskel, D., Michałowski, P. P., Hase, T., Stobiecki, F., Kuświk, P. & Atkinson, D. (2022). Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism. Physical Review B 105(9): 094433. © (2022) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
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