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Polarization control of THz light is of paramount interest for the numerousapplications offered in this frequency range. Recent developments in THzspintronic emitters allow for a very efficient broadband emission, andespecially unique is their ability of THz polarization switching throughmagnetization control of the ferromagnetic layer. Here we present an improvedscheme to achieve full 360{\deg} nearly coherent polarization rotation thatdoes not require multipolar or rotating external magnetic bias nor complexcascaded emitters. By replacing the FM layer of the spintronic emitter with acarefully designed FeCo/TbCo2/FeCo anisotropic heterostructure, weexperimentally demonstrate Stoner-Wohlfarth-like coherent rotation of the THzpolarization over a full 2pi azimuth only by a bipolar variation of thestrength of the hard axis field, and with only a negligible decrease in theemission efficiency as compared to standard Pt/CoFeB/W inverse spin Hallemitters. THz measurements are in agreement with our model of the non-perfectStoner-Wohlfarth behaviour. These emitters are well adapted for theimplementation of polarimetric characterization not requiring any mechanicallyrotating polarizing elements. An example is given with the characterization ofthe birefringence in a quartz plate.

360{\deg} polarization control of terahertz spintronic emitters using uniaxial FeCo/TbCo2/FeCo trilayers