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

doi:10.1063/1.4813763

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

30 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 H_c and ferromagnetic resonance linewidth ΔH_pp rely on the interfacial morphology. The Cu under-layer provides a rough surface, which offers an extra contribution to the ΔH_pp. The surface roughness was greatly enhanced by post-annealing for Cu, while little affected for Ru and Pd. Resultingly, the ΔH_pp and H_c of Cu/CoFeB increase significantly after annealing. However, for the annealed Ru/CoFeB sample, the ΔH_pp even decreases implying Ru is a proper under-layer material for CoFeB-based spintronic devices.

Original language	English (US)
Article number	032402
Journal	Applied Physics Letters
Volume	103
Issue number	3
DOIs	https://doi.org/10.1063/1.4813763
State	Published - 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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title = "Interfacial effect on the ferromagnetic damping of CoFeB thin films with different under-layers",

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.",

author = "Shaohai Chen and Minghong Tang and Zongzhi Zhang and B. Ma and Lou, {S. T.} and Jin, {Q. Y.}",

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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AU - Chen, Shaohai

AU - Tang, Minghong

AU - Zhang, Zongzhi

AU - Ma, B.

AU - Lou, S. T.

AU - Jin, Q. Y.

N1 - 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).

PY - 2013/7/15

Y1 - 2013/7/15

N2 - 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.

AB - 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.

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

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