layers Sphere UnivMaryland Memory GaN Polypropylene MagneticArray ferromagnetic HACrystal medical norganic MembraneFilter Genetic SurfaceOxidation HighResolution Display hetero_structure Chromium AIN cooling Magnetic Force Microscopy Potential Tapping Hair KevlarFiber self-assembly mechanical_property HafniumDioxide neodymium_magnets contact DOE hard_disk Inorganic_Compound Zhi Polyaniline