The role of the non-magnetic material in spin pumping and magnetization dynamics in NiFe and CoFeB multilayer systems

We present a study of the effective magnetization Meff and the effective damping parameter αeff by means of ferromagnetic resonance spectroscopy on the ferromagnetic (FM) materials Ni81Fe19 (NiFe) and Co40Fe40B20 (CoFeB) in FM/Pt, FM/NM, and FM/NM/Pt systems with the non-magnetic (NM) materials Ru,...

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Bibliographic Details
Published in:Journal of applied physics 2015-04, Vol.117 (16), p.163901
Main Authors: Ruiz-Calaforra, A., Brächer, T., Lauer, V., Pirro, P., Heinz, B., Geilen, M., Chumak, A. V., Conca, A., Leven, B., Hillebrands, B.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ANISOTROPY
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COBALT COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Damping
Dependence
Ferromagnetic materials
FERROMAGNETIC RESONANCE
HALL EFFECT
INTERFACES
INTERMETALLIC COMPOUNDS
IRON
IRON BORIDES
Iron compounds
LAYERS
Magnesium oxide
MAGNESIUM OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
Magnetism
MAGNETIZATION
Multilayers
NICKEL
Nickel compounds
PLATINUM
PUMPING
RUTHENIUM
Spin dynamics
SURFACES
System effectiveness
THIN FILMS
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Summary:We present a study of the effective magnetization Meff and the effective damping parameter αeff by means of ferromagnetic resonance spectroscopy on the ferromagnetic (FM) materials Ni81Fe19 (NiFe) and Co40Fe40B20 (CoFeB) in FM/Pt, FM/NM, and FM/NM/Pt systems with the non-magnetic (NM) materials Ru, Cr, Al, and MgO. Moreover, for NiFe layer systems, the influence of interface effects is studied by way of thickness dependent measurements of Meff and αeff. Additionally, spin pumping in NiFe/NM/Pt is investigated by means of inverse spin Hall effect (ISHE) measurements. We observe a large dependence of Meff and αeff of the NiFe films on the adjacent NM layer. While Cr and Al do not induce a large change in the magnetic properties, Ru, Pt, and MgO affect Meff and αeff in different degrees. In particular, NiFe/Ru and NiFe/Ru/Pt systems show a large perpendicular surface anisotropy and a significant enhancement of the damping. In contrast, the magnetic properties of CoFeB films do not have a large influence of the NM adjacent material and only CoFeB/Pt systems present an enhancement of αeff. However, this enhancement is much more pronounced in NiFe/Pt. By the introduction of the NM spacer material, this enhancement is reduced. Furthermore, a difference in symmetry between NiFe/NM/Pt and NiFe/NM systems in the output voltage signal from the ISHE measurements reveals the presence of spin pumping into the Pt layer in all-metallic NiFe/NM/Pt and NiFe/Pt systems.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4918909