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THz polarization control upon generation is a crucially missingfunctionality. THz spintronic emitters based on the inverse spin Hall effectallow for this by the strict implicit orthogonality between their magnetizationstate and the emitted polarization. This control was up till now onlydemonstrated using cumbersome external magnetic field biasing to impose apolarization direction. We present here for the first time an efficient voltagecontrol of the polarization state of terahertz spintronic emitters. Using aferromagnetic spin pumping multilayer exhibiting simultaneously strong uniaxialmagnetic anisotropy and magnetostriction in a crossed configuration, an emitteris achieved where in principle the stable magnetization direction can be fullyand reversibly controlled over a 90$^\circ$ angle span only by an electricvoltage. To achieve this, an engineered rare-earth based ferromagneticmultilayer is deposited on a piezoelectric$\textrm{(1-x)[Pb(Mg}_\textrm{0.33}\textrm{Nb}_\textrm{0.66})\textrm{O}_\textrm{3}\textrm{]-x[PbTiO}_\textrm{3}\textrm{]}$(PMN-PT) substrate. We demonstrate experimentally a reversible 70$^\circ$ THzpolarization rotation by sweeping the substrate voltage over 400V. Thisdemonstration allows for a fully THz polarization controlled ISHE spintronicterahertz emitter not needing any control of the magnetic bias.

Fully reversible magnetoelectric voltage controlled THz polarization rotation in magnetostrictive spintronic emitters on PMN-PT