Thickness dependent magnetization dynamics of perpendicular anisotropy Co/Pd multilayer films

Z. Liu, R. Brandt, O. Hellwig, S. Florez, T. Thomson, B. Terris, H. Schmidt

    Research output: Contribution to journalArticlepeer-review


    We present the measurements of the picosecond magnetization dynamics of Co/Pd multilayer films. The dynamic magnetization properties of sputtered multilayer films were analyzed as a function of Co layer thicknesses and applied bias field. Both the eigenfrequencies of the magnetization precession in the multilayers and the associated Gilbert damping exhibit extreme sensitivity to the magnetic layer thickness on an atomic monolayer scale. The eigenfrequency increases more than threefold when the Co thickness decreases from 7.5 to 2.8 , mainly due to the changes in effective saturation magnetization and perpendicular anisotropy constant. A concomitant 2.6-fold increase in the damping of the oscillations is observed and attributed to stronger interface dissipation in thinner Co layers. In addition, we introduce a quasi-1D micromagnetic model in which the multilayer stack is described as a one-dimensional chain of macrospins that represent each Co layer. This model yields excellent agreement with the observed resonance frequencies without any free parameters, while being much simpler and faster than full 3D micromagnetic modeling. © 2011 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)1623-1626
    Number of pages3
    JournalJournal of Magnetism and Magnetic Materials
    Issue number12
    Publication statusPublished - Jun 2011


    • Co/Pd
    • Magnetization dynamics
    • Micromagnetic modeling
    • Perpendicular anisotropy


    Dive into the research topics of 'Thickness dependent magnetization dynamics of perpendicular anisotropy Co/Pd multilayer films'. Together they form a unique fingerprint.

    Cite this