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

Interfacial effect on the ferromagnetic damping of CoFeB thin films with different under-layers
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不同底层CoFeB薄膜铁磁阻尼的界面效应

DOI:
10.1063/1.4813763
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发表时间:
2013-07
影响因子:
4
通讯作者:
Jin, Q. Y.
Jin, Q. Y.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Zongzhi;Ma, B.;Lou, S. T.;Jin, Q. Y.

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研究了不同衬底(Cu、Ru或Pd)对沉积态和退火态Co 64 Fe 16 B20薄膜磁性能的界面效应。固有的吉尔伯特阻尼因子被推断为略低于获得的值0.007。我们发现面内介电常数Hc和铁磁共振线宽ΔHpp都依赖于界面形貌。Cu底层提供了粗糙的表面,这为ΔHpp提供了额外的贡献。后退火对Cu的表面粗糙度有很大的提高,而对Ru和Pd的影响不大。退火后Cu/CoFeB的ΔHpp和Hc显著增加。然而,对于退火的Ru/CoFeB样品,ΔHpp甚至降低,这意味着Ru是用于基于CoFeB的自旋电子器件的合适的底层材料。
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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