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.

doi:10.1103/physrevb.105.094433

Title: Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism

Journal Article · Fri Mar 25 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.094433· OSTI ID:1868918

^[1]; Głowiński, H. ^[2];

^[3]; Haskel, D. ^[3];

^[4];

^[5];

^[2]; Kuświk, P. ^[2];

^[6]

Durham Univ. (United Kingdom); Univ. of Sheffield (United Kingdom)
Polish Academy of Sciences (PAS), Poznan (Poland)
Argonne National Lab. (ANL), Argonne, IL (United States)
Institute of Microelectronics and Photonics, Warsaw (Poland)
Univ. of Warwick, Coventry (United Kingdom)
Durham Univ. (United Kingdom)

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 Co₂₅Fe₇₅/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 L₃ 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. Finally, 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

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Centre (Poland) (NSC); ESPRC; Royal Society for DA

Grant/Contract Number:: AC02-06CH11357; 1771248; IF170030; 2019/33/B/ST5/02013

OSTI ID:: 1868918

Journal Information:: Physical Review. B, Vol. 105, Issue 9; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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SUPERCONDUCTIVITY AND SUPERFLUIDITY
magnetization dynamics
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spintronics
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thin films
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Title: Magnetic damping in ferromagnetic/heavy-metal systems: The role of interfaces and the relation to proximity-induced magnetism

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