Growth and Properties of Magnetic MnxGa Nanostructures

When: Wednesday, March 27, 2013 at 12:00 pm
Where: DA 114
Speaker: Michelle Jamer
Organization: Northeastern University
Sponsor: Introduction to Physics Research

Growth and Properties of Magnetic MnxGa Nanostructures Rare-Earth (RE) magnets are becoming more expensive and less available for current applications in technology. MnxGa (x=1-3) has previously shown coercivity of > 2.5 T, close to that of RE magnets. In this project, the vapor-liquid-solid (VLS) method was used to grow nanoparticles of MnxGa (x=2-3) with MBE. The goal was to study the magnetic properties as a function of reduced dimensionality. The samples were prepared by depositing a 3-6 nm layer of Au on Si, GaAs, and glass. Nanostructures, including regions of nanowires, were found using scanning electron microscopy on all samples. The magnetic properties of the nanostructured samples were studied with SQUID magnetometry and found to have a magnetization of 200 emu/cm3. Current research concerning epitaxial growth of MnxGa will also be discussed.