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Yoo, Jung-Woo
Functional Hybrid Materials and Devices Lab(FHMDL)
Research Interests
  • Transport properties, spintronics, organic/molucular magnet, electronic, and spintronics,
  • 2DEG, energy harvesting device, atomic/molecular layer deposition

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The effect of graphene interlayer at Pt/YIG interface on spin pumping

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Title
The effect of graphene interlayer at Pt/YIG interface on spin pumping
Author
Park, JungminOh, InseonLee, Ah-YeonJang, HansolYoo, Jung-WooJo, YounghunPark, Seung-Young
Issue Date
2020-07
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.829, pp.154534
Abstract
Spin pumping and the spin transfer torque in the normal metal (NM)/ferromagnetic materials (FM) heterostructure strongly depend on the interfacial spin memory loss. Therefore, the interface engineering of the NM/FM bilayer is important for enhancing spin pumping and spin-orbit torque efficiency for spin-orbitronic devices. In this study, we investigate the influence of the graphene interlayer between Pt and yttrium iron garnet (YIG) on spin pumping. Measurements of both the coplanar wave guide ferromagnetic resonance and inverse spin Hall effect with ferromagnetic resonance are performed to study the role of graphene in the transmission of the spin current at the interface. Results indicate a decreased Gilbert damping constant with the insertion of graphene interlayer, which causes the spin mixing conductance and inverse spin Hall voltage to be significantly reduced. The observed decrease in damping constant and spin injection is attributed to the presence of magnetic proximity effect and interfacial spin-orbit scattering, which causes graphene to serve as a spin-sink layer. (C) 2020 Elsevier B.V. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/32023
URL
https://www.sciencedirect.com/science/article/pii/S0925838820308975?via%3Dihub
DOI
10.1016/j.jallcom.2020.154534
ISSN
0925-8388
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