Majetich Group Projects
Nanomasking: Using the long-range order inherent in self-assembled monolayers of nanoparticles to pattern magnetic substrates, we can carry the data storage industry far beyond fundamental limitations in the areal bit density of conventional media.
C-AFM at 10nm: Development of a Conductive Atomic Force Microscopy technique that will be able to perform electrical characterization of nanopillars developed through the Nanomasking project with emphasis on data storage and spin torque switching.
Nanoparticles for Biological applications: Nanoparticles are the ideal size for use at the cellular level. Our work is focused on how to make biologically safe nanoparticles that can undergo controlled motion in a living cell via external applied magnetic fields.
Magnetic Refrigerator: Magnetic refrigeration utilizes the magnetocaloric effect and is an energy efficient, environmentally friendly alternative to conventional refrigeration. We have designed and built a small benchtop refrigerator that allows us to directly measure the cooling properties of materials that exhibit the magnetocaloric effect near room temperature.
Magnetic Imaging of Nanoparticle Arrays: Using electron beams, we can directly image magnetic configurations in nanoparticle arrays. We have seen wide, slowly-changing domain walls in arrays of ε-Co nanoparticles, using electron holography. For Fe3O4 monolayers, we have imaged stable dipolar domains until nearly the Curie temperature of the individual particles using Fresnel Lorentz transmission electron microscopy.
Magnetic Correlation Lengths through Small Angle Neutron Scattering (SANS): Small angle neutron scattering (SANS) is used to explore the behaviour of magnetic correlations in self-assembled arrays of magnetic nanoparticles, as a function of temperature and applied field. Using polarization analysis, it is possible to simultaneously extract information about all three vector components of the magnetization.
Small Angle X-ray Scattering (SAXS): Small-angle X-ray scattering (SAXS) is used to characterize the ordering of self-assembled Fe or ε-Co nanoparticle arrays. The particle spacing is found to depend on the dimensionality of the array, and the method of crystallization.