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Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy

Title
Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy
Authors
Sohn, JW[Sohn, Jeong-Woo]Song, HS[Song, Hyon-Seok]Kim, JW[Kim, Ji-Wan]Shin, IJ[Shin, Il-Jae]Min, BC[Min, Byoung-Chul]You, CY[You, Chun-Yeol]Shin, SC[Shin, Sung-Chul]
DGIST Authors
Sohn, JW[Sohn, Jeong-Woo]; Song, HS[Song, Hyon-Seok]; Shin, SC[Shin, Sung-Chul]
Issue Date
2016-04
Citation
Current Applied Physics, 16(4), 481-485
Type
Article
Article Type
Article
Keywords
Cobalt CompoundsCofebDampingDynamic BehaviorsGilbert DampingGilbert Damping ParameterMagnesiaMagnetic AnisotropyMagneto-Optical Kerr MeasurementsPerpendicular Magnetic AnisotropySpin-PumpingSpin DynamicsSpin PumpingUltra-Fast Magnetization Dynamics
ISSN
1567-1739
Abstract
We investigate the ultrafast magnetization dynamics of perpendicularly magnetized MgO/CoFeB/Ta and Ta/CoFeB/MgO stack structures using an all-optical time-resolved magneto-optical Kerr measurement technique. We find that the effective Gilbert damping parameter αeff converges to a low value of ∼0.02 in the high external field regime, and it stays unchanged at ∼0.02 regardless of the pump fluence. Two asymmetric stack structures of CoFeB show identical dynamic behavior and Gilbert damping, implying that the influence of the under and top interfaces is not distinct. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2704
DOI
10.1016/j.cap.2015.12.002
Publisher
Elsevier B.V.
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceQuantum Electric & Magnetic Materials Laboratory1. Journal Articles


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