Abstract

Wereport a study about the spin reorientation transition (SRT) fromperpendicular easy axis to in-plane easy axis of magnetization in Co/Au multilayers. A series of multilayers of Si/Au(100 Å)/{[Co(tCo)/Au(20 Å)]20}/Au(50 Å) family were studied, with Co layer thickness varying between 6 Å to 30 Å. The thickness of the Au layer was chosen large enough in order to minimize the interlayer exchange coupling between Co layers. In such thick Au-layer samples the magnetic properties aremainly the result of competition between interlayer magnetostatic coupling due to stray field, perpendicular magnetic anisotropy and shape anisotropy. The effective anisotropy constant Keff and the second order anisotropy K2 were deduced from the fit of the resonant magnetic field obtained from out of plane dependence Ferromagnetic Resonance (FMR) experiments. To study the SRT, we have plotted the phase diagram between Keff and K2. The results showthat SRT occurs through the metastable regionwith K2≤-1/2 Keff, (Keff N 0). It is interesting to note that FMR shows the coexistence of twomodeswith different anisotropy for small Co thickness,while for thick Co layers themodes have the sameanisotropy.Moreover, in thick Co layer samples, volume and surface spin wave resonance (SWR) modes were also excited by the microwave field, around the perpendicular FMR geometry, giving a clear evidence of a magnetic coupling between the Co layers.

Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalThin Solid Films
Volume568
Issue number1
DOIs
StatePublished - 2014

Bibliographical note

Funding Information:
This work was supported by the Brazilian agencies FAPERJ and CNPq . J. Quispe-Marcatoma thanks to the Peruvian Doctoral Scholarship program FINCYT/LASPAU for his PhD fellowship and to Cooperative Doctoral Scholarship Program ICTP/CLAF.

Publisher Copyright:
© 2013 Elsevier B.V. All rights reserved.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • Cobalt
  • Ferromagnetic resonance
  • Gold
  • In-plane magnetization
  • Magnetic anisotropy
  • Magnetic multilayers
  • Out-of-plane magnetization
  • Spin reorientation transition
  • Thin films

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