The influence of interface on spin pumping effect in Ni{sub 80}Fe{sub 20} /Tb bilayer

Journal Article · Sun May 15 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4944404· OSTI ID:22611761

Yue, Jinjin; Jiang, Sheng; Zhang, Dong; Yuan, Honglei; Wang, Yukun ^[1]; Lin, Lin; Zhai, Ya ^[1]; Du, Jun; Zhai, Hongru ^[2]

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1. Department of Physics, Southeast University, Nanjing 211189 (China)
2. National Laboratory of Solid Microstructures, Nanjing University, Nanjing 210093 (China)

Focusing on the interface effect of the Ni{sub 80}Fe{sub 20} (Py)/terbium (Tb) bilayer, the influence of interface on the magnetization dynamic damping is investigated systematically. Two series of Py (12 nm)/Tb (d nm) films with and without copper (Cu) (1 nm) interlayer are deposited on silicon (Si) substrates by DC magnetron sputtering at room temperature. From vibrating sample magnetometer (VSM) measurements, the saturation magnetization (M{sub s}) decreases with increasing Tb thickness in Py/Tb bilayer while the decrease of M{sub s} is suppressed efficiently by inserting a Cu layer with even 1 nm of thickness. From the frequency dependence of ferromagnetic resonance (FMR) linewidth, we can obtain the Gilbert damping coefficient (α), α is found to exhibit an extreme enhancement in comparison to the single Py layer and shows an increasing trend with increasing Tb thickness. By inserting the Cu layer, α decreases significantly. From theoretical fitting, the spin diffusion length (λ{sub SD}) and spin mixing conductance (g{sup ↑↓}) are determined. It shows that the interface structure influences the spin mixing conductance but not the spin diffusion length.

• OSTI ID: 22611761
• Journal Information: AIP Advances, Vol. 6, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BINARY ALLOY SYSTEMS
DIFFUSION
DIFFUSION LENGTH
FERROMAGNETIC RESONANCE
FILMS
FREQUENCY DEPENDENCE
INTERFACES
IRON COMPOUNDS
LAYERS
MAGNETIZATION
MAGNETRONS
NANOSTRUCTURES
NICKEL COMPOUNDS
SATURATION
SPIN
SUBSTRATES
TEMPERATURE RANGE 0273-0400 K
TERBIUM
THICKNESS
VIBRATING SAMPLE MAGNETOMETERS