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Thickness dependent...
Thickness dependent enhancement of damping in Co2FeAl/β-Ta thin films
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- Akansel, Serkan, 1983- (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Kumar, Ankit (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Behera, Nilamani (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Husain, Sajid (author)
- Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
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- Brucas, Rimantas (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Chaudhary, Sujeet (author)
- Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India
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- Svedlindh, Peter (author)
- Uppsala universitet,Fasta tillståndets fysik
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(creator_code:org_t)
- American Physical Society, 2018
- 2018
- English.
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In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 97:13
- Related links:
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https://journals.aps...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- In the present work Co2FeAl (CFA) thin films were deposited by ion beam sputtering on Si (100) substrates at the optimized deposition temperature of 300°C. A series of CFA films with different thickness (tCFA ); 8, 10, 12, 14, 16, 18 and 20 nm were prepared and all samples were capped with a 5 nm thick b-Ta layer. The thickness dependent static and dynamic properties of the films were studied by SQUID magnetometry, in-plane as well as out-of-plane broadband VNA-FMR measurements and angle dependent cavity FMR measurements. The saturation magnetization and the coercive field were found to be weakly thickness dependent and lie in the range 900 – 950 kA/m and 0.53 – 0.87 kA/m, respectively. The effective damping parameter ( αeff) extracted from in-plane and out-of-plane FMR results reveal a 1/tCFA dependence, the values for the in-plane αeff being larger due to two-magnon scattering (TMS). The origin of the αeff thickness dependence is spin pumping into the non-magnetic b-Ta layer and in case of the in-plane αeff also a thickness dependent TMS contribution. From the out-of-plane FMR results, it was possible to disentangle the different contributions to αeff and to the extract values for the intrinsic Gilbert damping (αG ) and the effective spin-mixing conductance (g_eff^↑↓ ) of the CFA/ b-Ta interface, yielding αG=1.1X10-3 and g_eff^↑↓=2.90x1019 m-2.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Keyword
- Magnetization dynamics
- magnetic thin films
- Gilbert damping
- ferromagnetic resonance
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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