| Autor: |
Martin-Rio S; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain., Konstantinovic Z; Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Belgrade 11 000, Serbia., Pomar A; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain., Balcells L; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain., Pablo-Navarro J; Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain.; Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain., Ibarra MR; Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain.; Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain., Magén C; Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain.; Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain., Mestres N; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain., Frontera C; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain., Martínez B; Instituto de Ciencia de Materiales de Barcelona, ICMAB-CSIC, Campus Universitario UAB, Bellaterra, Barcelona 08193, Spain. |
| Abstrakt: |
Spin injection and spin-charge conversion processes in all-oxide La 2/3 Sr 1/3 MnO 3 /SrIrO 3 (LSMO/SIO) heterostructures with different SIO layer thickness and interfacial features have been studied. Ferromagnetic resonance (FMR) technique has been used to generate pure spin currents by spin pumping (SP) in ferromagnetic (FM) half-metallic LSMO. The change of the resonance linewidth in bare LSMO layers and LSMO/SIO heterostructures suggests a successful spin injection into the SIO layers. However, low values of the spin mixing conductance, compared to more traditional permalloy (Py)/Pt or yttrium iron garnet (YIG)/Pt systems, are found. A thorough analysis of the interfaces by high-resolution scanning transmission electron microscopy (HR-STEM) imaging suggests that they are structurally clean and atomic sharp, but a compositional analysis by energy-dispersive X-ray spectroscopy (EDS) reveals the interdiffusion of La, Ir, and Mn atomic species in the first atomic layers close to the interface. Inverse spin Hall effect (ISHE) measurements evidence that interfacial features play a very relevant role in controlling the effectiveness of the spin injection process and low transversal ISHE voltage signals are detected. In addition, it is found that larger voltage signals are detected for the lowest SIO layer thickness highlighting the role of the spin diffusion length (λ sd )/SIO layer thickness ratio. The values of ISHE voltage are rather low but allow us to determine the spin Hall angle of SIO (θ SH ≈ 1.12% at T = 250 K), which is remarkably similar to that obtained for the well-known Py/Pt system, therefore suggesting that SIO could be a promising spin-Hall material. |
