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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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

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51222103, 11274113, 11074046, 51171047, and 61078030), and the National Basic Research Program of China (2009CB929201). Z. Zhang thanks for the support from the Program for New Century Excellent Talents in University (NCET-12-0132). B. Ma thanks for the support from the NSFC (Grant Nos. 51071046 and 11174056).

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