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All-optical study o...
All-optical study of tunable ultrafast spin dynamics in Co/Pd /NiFe systems: the role of spin-twist structure on Gilbert damping
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Banerjee, C. (författare)
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Pal, S. (författare)
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- Ahlberg, Martina (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Nguyen, T. N. Anh (författare)
- KTH,Material- och nanofysik,Vietnam Acad Sci & Technol, Vietnam
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- Åkerman, Johan, 1970 (författare)
- KTH,Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Material- och nanofysik,Univ Gothenburg, Sweden
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Barman, A. (författare)
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(creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: Rsc Advances. - : Royal Society of Chemistry (RSC). - 2046-2069. ; 6:83, s. 80168-80173
- Relaterad länk:
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http://arxiv.org/pdf...
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- We investigate optically induced ultrafast magnetization dynamics in [Co(0.5 nm)/Pd(1 nm)](5)/NiFe(t) exchange-spring samples with tilted perpendicular magnetic anisotropy using a time-resolved magneto-optical Kerr effect magnetometer. The competition between the out-of-plane anisotropy of the hard layer, the in-plane anisotropy of the soft layer and the applied bias field reorganizes the spins in the soft layer, which are modified further with the variation in t. The spin-wave spectrum, the ultrafast demagnetization time, and the extracted damping coefficients - all depend on the spin distribution in the soft layer, while the latter two also depend on the spin-orbit coupling between the Co and Pd layers. The spin-wave spectra change from multimode to single-mode as t decreases. At the maximum field reached in this study, H = 2.5 kOe, the damping shows a nonmonotonic dependence on t with a minimum at t = 7.5 nm. For t < 7.5 nm, intrinsic effects dominate, whereas for t > 7.5 nm, extrinsic effects govern the damping mechanisms.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- magnetization dynamics
- thin-films
- demagnetization
- bilayers
- domain
- Chemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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