Phys.org  September 6, 2018 A team of researchers in the US (UT San Antonio, Los Alamos National Laboratory) demonstrated that when an assembly of ferromagnetic core (cobalt ferrite) and a ferroelectric shell (barium titanate) is operated in external magnetic fields, it exhibits a controllable amplitude modulation when the magnetic field is applied antiparallel to the THz wave propagation direction; yet the same assembly displays an additional phase modulation when the magnetic field is applied along the propagation direction. Phase modulation is a result of stress-mediated piezoelectricity of the outer ferroelectric shell. The findings could enable tiny, high frequency transistors, create […]