TY - JOUR
T1 - Perpendicular anisotropy and gilbert damping in sputtered Co/Pd multilayers
AU - Kato, T.
AU - Matsumoto, Y.
AU - Kashima, S.
AU - Okamoto, S.
AU - Kikuchi, N.
AU - Iwata, S.
AU - Kitakami, O.
AU - Tsunashima, S.
N1 - Funding Information:
The authors would like to thank M. Kumazawa of Nagoya University for assistance in the experiments. This work was supported in part by the following grants: Grand-in-Aids for Scientific Research from the Ministry of Education, Culture, Sports, Science, SCOPE from the Ministry of Internal Affairs and Communications, and Technology and Knowledge Cluster Initiative from the Ministry of Education, Culture, Sports, Science and Technology.
PY - 2012
Y1 - 2012
N2 - Gilbert damping constants α of Co/Pd multilayers with various layered structures were estimated by time resolved magneto-optical Kerr effect. The [Co( t-Co/Pd( t-Pd] 6 multilayers exhibiting a perpendicular magnetic anisotropy (PMA) were prepared by dc magnetron sputtering on a Pd (1 nm)/Ta (30 nm)/oxidized Si substrate. The PMA of the multilayer having t-Co/t-Pd=0.55 increased with decreasing the bilayer period, t-Co+t Pd, while all the multilayers showed almost the same α of 0.09. The same trend was seen for Co/Ni multilayers with a constant t-Co/t Ni, although the values of α are different, i.e., 0.035 for Co/Ni. From the estimation of the damping α of the multilayers with various t-Co/t Pd, the α was confirmed to be enhanced when the ratio t-Co/t Pd becomes lower than 0.8. Moreover, the linear relationship between the α and t-Pd/t Co was found. These results suggest that the damping α of both Co/Pd and Co/Ni multilayers are not closely correlated with their PMA, and mainly determined by the composition of the multilayers.
AB - Gilbert damping constants α of Co/Pd multilayers with various layered structures were estimated by time resolved magneto-optical Kerr effect. The [Co( t-Co/Pd( t-Pd] 6 multilayers exhibiting a perpendicular magnetic anisotropy (PMA) were prepared by dc magnetron sputtering on a Pd (1 nm)/Ta (30 nm)/oxidized Si substrate. The PMA of the multilayer having t-Co/t-Pd=0.55 increased with decreasing the bilayer period, t-Co+t Pd, while all the multilayers showed almost the same α of 0.09. The same trend was seen for Co/Ni multilayers with a constant t-Co/t Ni, although the values of α are different, i.e., 0.035 for Co/Ni. From the estimation of the damping α of the multilayers with various t-Co/t Pd, the α was confirmed to be enhanced when the ratio t-Co/t Pd becomes lower than 0.8. Moreover, the linear relationship between the α and t-Pd/t Co was found. These results suggest that the damping α of both Co/Pd and Co/Ni multilayers are not closely correlated with their PMA, and mainly determined by the composition of the multilayers.
KW - Co/Pd multilayer
KW - Gilbert damping
KW - magnetization dynamics
KW - time-resolved magneto-optical Kerr effect
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U2 - 10.1109/TMAG.2012.2198446
DO - 10.1109/TMAG.2012.2198446
M3 - Article
AN - SCOPUS:84867763489
SN - 0018-9464
VL - 48
SP - 3288
EP - 3291
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 6332782
ER -