Spin pump and probe in lanthanum strontium manganite/platinum bilayers

Ferromagnetic resonance driven spin pumping (FMR-SP) is a novel method to transfer spin current from the ferromagnetic (FM) layer into the adjacent normal metal (NM) layer in an FM/NM bilayer system. Consequently, the spin current could be probed in NM layer via inverse spin Hall effect (ISHE). In s...

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Bibliographic Details
Published in:Scientific reports 2017-07, Vol.7 (1), p.6612-9, Article 6612
Main Authors: Luo, G. Y., Lin, J. G., Chiang, Wen-Chung, Chang, Ching-Ray
Format: Article
Language:English
Subjects:
639/301
639/766
Conductance
Efficiency
Electromagnetism
Heavy metals
Humanities and Social Sciences
Investigations
Lanthanum
multidisciplinary
Physics
Platinum
Science
Science (multidisciplinary)
Single crystals
Strontium
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Summary:Ferromagnetic resonance driven spin pumping (FMR-SP) is a novel method to transfer spin current from the ferromagnetic (FM) layer into the adjacent normal metal (NM) layer in an FM/NM bilayer system. Consequently, the spin current could be probed in NM layer via inverse spin Hall effect (ISHE). In spite of numerous ISHE studies on FM/Pt bilayers, La 0.7 Sr 0.3 MnO 3 (LSMO)/Pt system has been less explored and its relevant information about interface property (characterized by spin mixing conductance) and spin-charge conversion efficiency (characterized by spin Hall angle) is a matter of importance for the possible applications of spintronic devices. In this work, the technique of FMR-SP has been applied on two series of LSMO/Pt bilayers with the thickness of each layer being varied. The thickness dependences of ISHE voltage allow to extract the values of spin mixing conductance and spin Hall angle of LSMO/Pt bilayers, which are (1.8 ± 0.4) × 10 19  m −2 and (1.2 ± 0.1) % respectively. In comparison with other FM/Pt systems, LSMO/Pt has comparable spin current density and spin mixing conductance, regardless its distinct electronic structure from other ferromagnetic metals.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-06861-1