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Selective Tuning of Gilbert Damping in Spin-Valve Trilayer by Insertion of Rare-Earth Nanolayers

DOI: 10.1021/acsami.5b03595 DOI Help
PMID: 26177747 PMID Help

Authors: Wen Zhang (Southeast University, Nanjing, China) , Dong Zhang (Southeast University, Nanjing, China) , Ping Kwan Johnny Wong (National University of Singapore) , Honglei Yuan (Southeast University, Nanjing, China) , Sheng Jiang (Southeast University, Nanjing, China) , Gerrit Van Der Laan (Diamond Light Source) , Ya Zhai (Southeast University, Nanjing, China) , Zuhong Lu (Southeast University, Nanjing, China)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Applied Materials & Interfaces , VOL 7 (31) , PAGES 17070 - 17075

State: Published (Approved)
Published: August 2015

Abstract: Selective tuning of the Gilbert damping constant, alpha, in a NiFe/Cu/FeCo spin-valve trilayer has been achieved by inserting different rare-earth nanolayers adjacent to the ferromagnetic layers. Frequency dependent analysis of the ferromagnetic resonances shows that the initially small magnitude of alpha in the NiFe and FeCo layers is improved by Tb and Gd insertions to various amounts. Using the element-specific technique of X-ray magnetic circular dichroism, we find that the observed increase in alpha can be attributed primarily to the orbital moment enhancement of Ni and Co, rather than that of Fe. The amplitude of the enhancement depends on the specific rare-earth element, as well as on the lattice and electronic band structure of the transition metals. Our results demonstrate an effective way for individual control of the magnetization dynamics in the different layers of the spin-valve sandwich structures, which will be important for practical applications in high-frequency spintronic devices.

Journal Keywords: XMCD; Spintronics; Rare Earths

Subject Areas: Physics, Materials, Energy

Facility: MAX-lab