Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4813542
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Funding
- DGIST R&D Program of the Ministry of Education, Science and Technology of Korea [11-IT-01]
- National Research Foundation of Korea (NRF)
- Korean government (MEST) [NRF-2007-0056631, 2010-0023798, 2010-0022040, 2012R1A1A1041590]
- National Research Foundation of Korea [2012R1A1A1041590] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The relationship between Gilbert damping and magneto-crystalline anisotropy is studied here using an all-optical method in a perpendicular Co/Ni multilayer system by varying the Ti-buffer thickness. As the Ti-buffer thickness increases, the magneto-crystalline anisotropy is enhanced. The time-resolved Kerr signal of each sample is well described by its own intrinsic Gilbert damping constant in a wide range of the external magnetic field. Interestingly, we find that Gilbert damping constants increase linearly from 0.021 to 0.036 when the magneto-crystalline anisotropy of the samples varies from 2.4 to 3.4 Merg/cm(3). Such a linear relationship implies that the spin-orbit interaction is the main source of the damping process through spin-lattice relaxation in our system. (C) 2013 AIP Publishing LLC.
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