Proceedings of the Korean Magnestics Society Conference (한국자기학회:학술대회 개요집)
- 2000.09a
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- Pages.279-286
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- 2000
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- 2233-9485(pISSN)
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- 2233-9574(eISSN)
MAGNETIC FIELD DEPENDENCE OF MAGNETIZATION REVERSAL BEHAVIOR IN Co/Pt MULTILAYERS.
- Cho, Yoon-Chul (Dept. of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology) ;
- Choe, Sug-Bong (Dept. of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology) ;
- Shin, Sung-Chul (Dept. of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology)
- Published : 2000.09.01
Abstract
Magnetic field dependence of magnetization reversal in Co/Pt multilayers has been quantitatively investigated. Serial samples of Co/Pt multilayers have been prepared by dc-magnetron sputtering under various Ar pressure. Magnetization reversal was monitored by magnetization viscosity measurement and direct domain observation using a magneto-optical microscope system, and the wall-motion speed and the nucleation rate R were determined using a domain reversal model based on time-resolved domain reversal patterns. Both and R were found to be exponentially dependent on the reversing applied field. From the exponential dependencies, the activation volumes of the wall motion and nucleation could be determined based on a thermally activated relaxation model, and the wall-motion activation volume was revealed to be slightly larger than the nucleation activation volume.
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