Magnetism at High Pressures
The occurrence of spontaneous ordering of electronic magnetic moments in a solid is intimately connected to the overlap of their electronic wavefunctions. Altering this overlap by the application of pressure has profound effects on both direct, and indirect exchange (magnetic) interactions responsible for magnetic ordering phenomena.
Coupled with the high-brilliance, penetration power, and polarization/energy tunability of synchrotron radiation, x-ray studies of magnetism at high pressure in the diamond anvil cell provide a unique opportunity to tune, hence help decipher, complex exchange interactions in magnetic materials of current technological and fundamental interest.
We demonstrate the uniqueness of this approach by reviewing methodologies and instrumentation that enable polarization-modulated, x-ray absorption spectroscopy studies under simultaneous external stimuli of high pressure (1 Mbar), magnetic field (6.5 Tesla) and low temperature (1.4 K). Recent advances derived from this approach in our understanding of magnetic interactions in a number of complex magnetic materials of current interest, are highlighted.
Daniel Haskel is Group Leader of the Magnetic Materials group at the Advanced Photon Source of Argonne National Laboratory. He holds Bachelor’s and Master’s degrees in Physics from the Israel Institute of Technology (Technion), and a Ph.D. in Physics from the University of Washington in Seattle. His current research focuses on probing magnetic materials at extreme pressure conditions.
Daniel is the author of 110 peer-reviewed publications and presenter of 47 invited lectures. Daniel is also an Adjunct Associate Professor of Physics at Washington University in St. Louis, elected Secretary/Treasurer of the International X-ray Absorption Society, and editorial board member of Scientific Reports, a Nature journal.