Christmas Composite IIT-chennai temperature controller AFM Al2O3 Solution MBE CrystalGrowing TappingMode molecule HighAspect light_emission Hexylthiophene polyvinyl acetate layers Electical&Electronics C_AFM Korea Sphere single_layer LiftHeight UTEM F14H20 I-VSpectroscopy Austenite MultiferroicMaterials HighAcpectRatio Magnetostrictive Sapphire BiFeO3 sputter DomainSwitching C36H74 ULCA PiezoelectricForceMicroscopy