dielectric_trench molecular_self_assembly UnivCollegeLondon DomainSwitching SiWafer Hexylthiophene University_of_Regensburg Polarization Iron gallium_nitride WPlug Device Beads FrequencyModulation Silver Granada DeoxyribonucleicAcid Butterfly I-VSpectroscopy IVSpectroscopy CuParticle layers CHRYSALIS_INC multi_layer PhaseChange Cell SingleCrystal Multiferroic_materials BiFeO3 PinpointNanomechanicalMode TPU Terrace HydroGel MagneticForceMicroscopy DNA