TY - JOUR
T1 - Temperature and Thickness Dependence of Statistical Fluctuations of the Gilbert Damping in Co - Fe - B / Mg O Bilayers
AU - Sampan-A-Pai, Sutee
AU - Chureemart, Jessada
AU - Chantrell, Roy W.
AU - Chepulskyy, Roman
AU - Wang, Shuxia
AU - Apalkov, Dmytro
AU - Evans, Richard F.L.
AU - Chureemart, Phanwadee
N1 - © 2019 American Physical Society. Uploaded with permission of the publisher/copyright holder. Further copying may not be permitted; contact the publisher for details
PY - 2019/4/1
Y1 - 2019/4/1
N2 - We theoretically investigate the temperature and thickness dependence of the effective Gilbert damping constant (α) in the Co-Fe-B/MgO system using atomistic spin dynamics. We consider a high damping constant at the interface layer and a low damping constant for the bulklike layers due to large interfacial spin-orbit coupling. We find a strong dependence of the effective Gilbert damping with the film thickness, in quantitative agreement with experimental data. The temperature dependence of the effective damping arising from thermal-spin fluctuations up to temperatures of 400 K is weak, with no apparent change over the studied temperature range. Interestingly, we find that the temperature produces a different effect: a statistical fluctuation of the Gilbert damping parameter for a given relaxation induced solely from the finite size of the system. This statistical variation of the Gilbert damping is an intrinsic effect and is important for spintronic devices operating at gigahertz frequencies, where the dynamic response must be carefully controlled.
AB - We theoretically investigate the temperature and thickness dependence of the effective Gilbert damping constant (α) in the Co-Fe-B/MgO system using atomistic spin dynamics. We consider a high damping constant at the interface layer and a low damping constant for the bulklike layers due to large interfacial spin-orbit coupling. We find a strong dependence of the effective Gilbert damping with the film thickness, in quantitative agreement with experimental data. The temperature dependence of the effective damping arising from thermal-spin fluctuations up to temperatures of 400 K is weak, with no apparent change over the studied temperature range. Interestingly, we find that the temperature produces a different effect: a statistical fluctuation of the Gilbert damping parameter for a given relaxation induced solely from the finite size of the system. This statistical variation of the Gilbert damping is an intrinsic effect and is important for spintronic devices operating at gigahertz frequencies, where the dynamic response must be carefully controlled.
UR - http://www.scopus.com/inward/record.url?scp=85064151102&partnerID=8YFLogxK
U2 - 10.1103/PhysRevApplied.11.044001
DO - 10.1103/PhysRevApplied.11.044001
M3 - Article
AN - SCOPUS:85064151102
SN - 2331-7019
VL - 11
JO - Physical Review Applied
JF - Physical Review Applied
IS - 4
M1 - 044001
ER -