Depth-Dependent Magnetization Profiles of Hybrid Exchange Springs

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We report on the magnetization depth profile of a hybrid exchange-spring system in which a Co/Pd multilayer with perpendicular anisotropy is coupled to a CoFeB thin film with in-plane anisotropy. The competition between these two orthogonal anisotropies promotes a strong depth dependence of the magnetization orientation. The angle of the magnetization vector is sensitive both to the strength of the individual anisotropies and to the local exchange constant and is thus tunable by changing the thickness of the CoFeB layer and by substituting Ni for Pd in one layer of the Co/Pd stack. The resulting magnetic depth profiles are directly probed by element-specific x-ray magnetic circular dichroism of the Fe and Ni layers located at different average depths. The experimental results are corroborated by micromagnetic simulations.


  • T. N. Anh Nguyen
  • R. Knut
  • V. Fallahi
  • S. Chung
  • Q. Tuan Le
  • S. M. Mohseni
  • O. Karis
  • Sergey Peredkov
  • R. K. Dumas
  • Casey W. Miller
  • J. Akerman
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Natural Sciences
  • Physical Sciences
Original languageEnglish
Article number044014
JournalPhysical Review Applied
Issue number4
Publication statusPublished - 2014
Publication categoryResearch