Magnetoelectric tuning of the Inverse spin-Hall effect

J. M. VARGAS; L. AVILÉS-FÉLIX; J. E. GÓMEZ; A. BUTERA

New Orleans

Conferencia; 61st Annual Conference on Magnetism and Magnetic Materials; 2016

AIP

The generation, manipulation, and detection of a spincurrent, a flow of electron spins in a solid, is a subject of rapidly growinginterest in the field of spintronic.[1-3] The inverse spin-Hall effect (ISHE)is originated on the strong spin-orbit interaction in some heavy metals. Becausethe spin-orbit interaction bends trajectories in the same way for electronswith opposite spins that travels in opposite directions, this mechanismconverts a spin current into an effective electric voltage (VISHE). Thus, by measuring VISHE, the ISHE can be usedfor the direct and sensitive detection of a spin current. Yet, the fast controland low power consumption of this current is a complex issue on devicetechnology. In this work is presented a novel method to control and tune theISHE signal through magnetoelectric coupling effect (ME), applying electricfields (E-fields). Themagnetoelectric composite was prepared by dc sputtering, where a thin film ofFePt (20 nm) was grown on top of a 011-cut single crystal PMNT slab (thicknessof 0.05 cm).The PMNT/FePt operates in the L-T mode (longitudinal magnetized-transversepolarized). Next, with the aim to measure the induced VISHE signal, a small stripe of Pt (10 nm) is grown ontop of this FePt film. Structural characterization indicates that the FePt isgrown in the chemically disordered A1 fcc phase. The study was conducted bycombining ferromagnetic resonance (FMR) at microwave frequency of 9.78 GHz andISHE voltage measurements. Figure 1 a) shows the FMR and ISHE typical signals. Figure 1 b)shows the evolution of the ISHE signal at different E-field values. It clearly shows that the magnetic field valuewhere the maximum ISHE signal is observed (HISHE) can be tuned by anE-field. This trend is summarized in Figure2 where is shown the variation of the HISHE as a function of the E-field. In addition, the intensity of VISHEis almost independent of the E-field.Here we are presenting novel details of this E-field tuning effects and their correlation properties, in whichit is obtaining a good agreement with the predictions of both inverse spin-Halleffect and ME theory.[4,5]Bibliography[1] F. J. Jedema, A. T. Filip and B.J. van Wees, Nature 410, 345 (2001)[2] O. Mosendz, J. E. Pearson, F. Y.Fradin, G. E. W. Bauer, S. D. Bader, A. Hoffmann, Phys. Rev. Lett. 104, 046601 (2010).[3] C. Hahn, G. de Loubens, O. Klein,M. Viret, V. V. Naletov, J. Ben Youssef, Phys. Rev. B 87, 174417 (2013).[4] J. E. Gomez, B. Zerai Tedlla, N.R. Alvarez, G. Alejandro, E. Goovaerts, and A. Butera, Phys. Rev. B 90, 184401 (2014).[5] Jose M. Vargas and Javier Gómez,APL Materials 2, 106105 (2014)     Figure 1. a) Typical ISHE signal and FMR spectrum of thePMNT/FePt/Pt system for E = 2.6kV/cm. b) Evolution of the ISHE signal for different E-field values.