Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 767, Issue -, Pages 398-402Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.142
Keywords
YIG; CFAS; Spin-pumping; Exchange-coupling; Heterostructures; Spin mixing conductance
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Funding
- National Key Research and Development Plan [2016YFA0300801]
- National Natural Science Foundation of China [51702042, 61734002, 61571079, 51672007]
- Sichuan Science and Technology Support Project [2016GZ0250, 2017JY0002, 2017GZ0111]
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Gilbert damping enhancement induced by the spin pumping effect is investigated in Y3Fe5O12(YIG)/heavy metal bilayers. Because its spin polarization is high and Gilbert damping is low, Co2FeAl0.5Si0.5 (CFAS) is deemed a promising ferromagnetic material in spintronics devices. We studied microwave dynamic magnetizations in YIG/CFAS bilayers combined with ferromagnetic resonance measurement using a vector network analyzer to reveal a 5-fold giant damping enhancement compared with that for the YIG/Pt bilayers. This phenomenon was attributed to both the exchange coupling effect and spin pumping effect. By inserting a 10-nm Cu spacer, direct exchange coupling can be suppressed. A spin mixing conductance g(eff)(up arrow down arrow) of 7.75 x 10(18) m(-2) generated by spin pumping was obtained. The study provides an effective approach to tailor the damping in magnetic thin films. (C) 2018 Elsevier B.V. All rights reserved.
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