PDMS Ni81Fe19 NusEce Sperm HBN GaAs Sadowski Kevlar MagneticArray UnivOfMaryland CopperFoil PrCurve Phenanthrene Vanadate ContactModeDots Leakage Mosfet Litho ring shape TransitionMetal ContactMode HOPG ElectroChemical Sapphire ForceVolumeMapping fluorocarbon China SPMLabs Permalloy Ucl HDD GaP IMT_Bucharest thermal_property OrganicCompound