Interfacial effect on the ferromagnetic damping of CoFeB thin films with different under-layers

Shaohai Chen, Minghong Tang, Zongzhi Zhang, B. Ma, S. T. Lou, Q. Y. Jin

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26 Scopus citations

Abstract

Interfacial effects on magnetic properties are investigated for the as-deposited and annealed Co64Fe16B20 films with different under-layers (Cu, Ru, or Pd). The intrinsic Gilbert damping factor is inferred to be slightly lower than the obtained value of 0.007. We found that both the in-plane coercivity Hc and ferromagnetic resonance linewidth ΔHpp rely on the interfacial morphology. The Cu under-layer provides a rough surface, which offers an extra contribution to the ΔHpp. The surface roughness was greatly enhanced by post-annealing for Cu, while little affected for Ru and Pd. Resultingly, the ΔHpp and Hc of Cu/CoFeB increase significantly after annealing. However, for the annealed Ru/CoFeB sample, the ΔHpp even decreases implying Ru is a proper under-layer material for CoFeB-based spintronic devices.

Original languageEnglish (US)
Article number032402
JournalApplied Physics Letters
Volume103
Issue number3
DOIs
StatePublished - Jul 15 2013

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