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

Abstract

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

References in corpus (8)

• Efficient metallic spintronic emitters of ultrabroadband terahertz radiation
• Engineering ultrafast spin currents and terahertz transients by magnetic heterostructures
• Powerful and Tunable THz Emitters Based on the Fe/Pt Magnetic Heterostructure
• Optimized Spintronic Terahertz Emitters Based on Epitaxial Grown Fe/Pt Layer Structures
• Efficient Terahertz Generation Using Fe/Pt Spintronic Emitters Pumped at Different Wavelengths
• Modification of spintronic terahertz emitter performance through defect engineering
• 360° polarization control of terahertz spintronic emitters using uniaxial FeCo/TbCo2/FeCo trilayers
• Terahertz Emission From an Exchange-Coupled Synthetic Antiferromagnet

Cited by in corpus (2)

• Maximizing the electromagnetic efficiency of spintronic terahertz emitters
• High-efficiency Pt${}_{75}$Au${}_{25}$-based spintronic terahertz emitters