Effect of Meissner Screening and Trapped Magnetic Flux on Magnetization Dynamics in Thick Nb/Ni80Fe20/Nb Trilayersopen access
- Authors
- Jeon, Kun-Rok; Ciccarelli, Chiara; Kurebayashi, Hidekazu; Cohen, Lesley F.; Montiel, Xavier; Eschrig, Matthias; Wagner, Thomas; Komori, Sachio; Srivastava, Anand; Robinson, Jason W.A.; Blamire, Mark G.
- Issue Date
- Jan-2019
- Publisher
- American Physical Society
- Citation
- Physical Review Applied, v.11, no.1
- Journal Title
- Physical Review Applied
- Volume
- 11
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/63779
- DOI
- 10.1103/PhysRevApplied.11.014061
- ISSN
- 2331-7019
2331-7019
- Abstract
- We investigate the influence of Meissner screening and trapped magnetic flux on magnetization dynamics for a Ni80Fe20 film sandwiched between two thick Nb layers (100 nm) using broadband (5-20 GHz) ferromagnetic resonance (FMR) spectroscopy. Below the superconducting transition Tc of Nb, significant zero-frequency line broadening (5-6 mT) and dc-resonance field shift (50 mT) to a low field are both observed if the Nb thickness is comparable to the London penetration depth of Nb films (≥100 nm). We attribute the observed peculiar behaviors to the increased incoherent precession near the Ni80Fe20/Nb interfaces and the effectively focused magnetic flux in the middle Ni80Fe20 caused by strong Meissner screening and (defect-)trapped flux of the thick adjacent Nb layers. This explanation is supported by static magnetic properties of the samples and comparison with FMR data on thick Nb/Ni80Fe20 bilayers. Great care should, therefore, be taken in the analysis of FMR response in ferromagnetic Josephson structures with thick superconductors, a fundamental property for high-frequency device applications of spin-polarized supercurrents. © 2019 American Physical Society.
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