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http://dx.doi.org/10.4283/JKMS.2011.21.6.204

Precessional Motion of Ferromagnetic Pt/Co/Pt Thin Film with Perpendicular Magnetic Anisotropy  

Yun, Sang-Jun (Department of Physics and Astronomy, Seoul National University)
Lee, Jae-Chul (Department of Physics and Astronomy, Seoul National University)
Choe, Sug-Bong (Department of Physics and Astronomy, Seoul National University)
Shin, Kyoung-Ho (Spin Device Research Center, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Magnetics Society / v.21, no.6, 2011 , pp. 204-207 More about this Journal
Abstract
We developed a time-resolved magneto-optical Kerr effect microscope system to investigate ultrafast magnetization dynamics. Based on the pump-probe method, 0.1-ps time resolution was achieved by use of a fs Ti:Sapphire laser. The magnetization dynamics was then measured on Pt/Co/Pt thin films with various Co thicknesses. All the samples exhibited ultrafast demagnetization within a few ps by direct heating of pump laser. Some thicker samples showed precessional motion of magnetization, from which the Gilbert damping constant was determined based on the Landau-Lifshitz-Gilbert equation.
Keywords
ultrafast; TR-MOKE; precessional motion; perpendicular magnetic anisotropy; damping constant;
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