The characteristics of pure spin current from the longitudinal spin Seebeck effect are investigated at room temperature in $\mathrm{Pt}/{\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ deposited on the ${({\mathrm{Pb}\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_3)}_{0.7}{({\mathrm{Pb}\mathrm{Ti}\mathrm{O}}_3)}_{0.3}$ substrate, through which electrostrain can be controllably applied. The applied voltage enables the modification of magnetic anisotropy in the magnetic insulating ${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$ layer, and thus the sensitivity of the spin Seebeck effect at small magnetic fields, without suppressing the spin Seebeck effect and the inverse spin Hall effect. This is due to the robust intrinsic physical parameters in $\mathrm{Pt}/{\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$. Our results pave the way for the application of voltage-controlled pure spin-current devices.

• Received 12 January 2018
• Revised 8 April 2018

DOI:https://doi.org/10.1103/PhysRevApplied.10.014004