Interfacial Structure Dependent Spin Mixing Conductance in Cobalt Thin Films.
Enhancement of Gilbert damping in polycrystalline cobalt thin-film multilayers of various thicknesses, overlayered with copper or iridium, was studied in order to understand the role of local interface structure in spin pumping. X-ray diffraction indicates that cobalt films less than 6 nm thick have strong fcc(111) texture while thicker films are dominated by hcp(0001) structure. The intrinsic damping for cobalt thicknesses above 6 nm is weakly dependent on cobalt thickness for both overlayer materials, and below 6 nm the iridium overlayers show higher damping enhancement compared to copper overlayers, as expected due to spin pumping. The interfacial spin mixing conductance is significantly enhanced in structures where both cobalt and iridium have fcc(111) structure in comparison to those where the cobalt layer has subtly different hcp(0001) texture at the interface.
Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
M
M
Tokaç
IFIMUP and IN, Departamento de Física e Astronomia, Universidade do Porto, 4169-007 Porto, Portugal.
S A
SA
Bunyaev
IFIMUP and IN, Departamento de Física e Astronomia, Universidade do Porto, 4169-007 Porto, Portugal.
G N
GN
Kakazei
Laboratorie PROMES CNRS (UPR 8521), Université de Perpignan Via Domitia, Rambla de la Termodynamique, Tecnosud, 66100 Perpignan, France.
D S
DS
Schmool
Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
D
D
Atkinson
Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom.
A T
AT
Hindmarch