Using Substrate Interactions to Stabilize Spin States in Molecules and Metallic Thin Films
Abstract: Spin crossover molecules can assume a high spin and a low spin state. Typically, temperature determines which state the molecule is in. By choosing supporting substrates we stabilize the spin crossover transition outside its native temperature window and open it to isothermal manipulation by x-rays and magnetic fields. As a second example we show how the magnetic moment of CoFeMn can be increased beyond previously assumed limits by locking in its crystal structure through epitaxial strain and creating a bcc CoFeMn thin films which don’t exist as bulk materials.
Bio: Alpha T. N’Diaye obtained his PhD in 2009 from RWTH Aachen University, Germany and came to Lawernce Berkeley Lab (LBL) for a postdoc at the National Center for Electron Microscopy. Since 2014 he is a scientist at the Advanced Light Source at LBL. Dr. N’Diaye has worked on graphene, self-organized nanostructures, and chiral magnetic spin textures. Currently he is engaged in multiple projects using of x-ray spectroscopy to investigate spin order and for magnetic materials discovery.