Suppression of the spin pumping in Pd/Ni{sub 81}Fe{sub 19} bilayers with nano-oxide layer

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3626593· OSTI ID:22027716

Kim, Duck-Ho; Kim, Hong-Hyoun; You, Chun-Yeol ^[1]

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1. Department of Physics, Inha University, Namgu Incheon 402-751 (Korea, Republic of)

We demonstrate that the spin pumping effect can be effectively suppressed with a nano-oxide layer. Spin pumping effect manifests itself by an enhancement of the Gilbert damping parameter in normal metal/ferromagnetic hetero-structures, while many spintronics devices prefer smaller damping parameter. Since the spin pumping effect is directly related with the spin dependent interface conductance, we can modify the spin pumping by altering the interface conductance with the nano-oxide layer. We prepared series of Pd/Ni{sub 81}Fe{sub 19} bilayers with different pausing time between Pd and Ni{sub 81}Fe{sub 19} depositions in order to control the interface conductance. The Gilbert damping parameters are determined from the line-width measurements in the ferromagnetic resonance spectra for each pausing time sample. They are 0.0490, 0.0296, 0.0278, and 0.0251 for 0, 6, 30, and 60 s pausing time, respectively. We find that the damping parameter of Pd/Ni{sub 81}Fe{sub 19} is almost recovered to one of the Cu/Ni{sub 81}Fe{sub 19} bilayer with 60 s pausing time, while the static magnetic properties are not noticeably changed.

• OSTI ID: 22027716
• Journal Information: Applied Physics Letters, Vol. 99, Issue 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
DAMPING
DEPOSITION
FERROMAGNETIC MATERIALS
FERROMAGNETIC RESONANCE
HETEROJUNCTIONS
INTERFACES
IRON ALLOYS
LAYERS
LINE WIDTHS
MAGNETIC PROPERTIES
NANOSTRUCTURES
NICKEL ALLOYS
PALLADIUM
PUMPING
SPIN