Ultrathin (CoFe/Pt)_n multilayers with tuned magnetic properties

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• 作者：J.F. Feng ; ^jfeng@tcd.ie ; ^{jiafeng98@gmail.com} ; K. Rode ; K. Ackland ; P.S. Stamenov ; M. Venkatesan ; J.M.D. Coey
• 关键词：Perpendicular magnetic anisotropy ; Ultrathin multilayer ; Annealing effect
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：324
• 期：14
• 页码：2298-2300
• 全文大小：513 K

文摘

Perpendicular magnetic anisotropy (PMA) has been investigated in ultrathin (CoFe [0.2] nm/Pt [0.2] nm)_m>nm> multilayers. The Pt layers show an fcc crystal structure with a preferred [111] orientation. The multilayers with n=3, 4 show PMA in the as-grown state, which can be enhanced by thermal annealing. However, no PMA is observed in the as-grown state with higher repetitions (n>&=5), although it is observed after thermal annealing. For 1=&<n=&<8, the anisotropy energy is around 10⁵ J/m³ for all (CoFe [0.2]/Pt [0.2])_m>nm> stacks. The perpendicular anisotropy is related to layer thickness and interface roughness.