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Location

Disque Hall, Room 919, 32 South 32nd Street, Philadelphia, PA 19104

Audience

  • Undergraduate Students
  • Graduate Students
  • Faculty

Physics Colloquium: Nanoparticle Magnetism Through the Lens of Mössbauer Spectroscopy

Thursday, January 22, 2015

3:30 PM-4:30 PM

Georgia Papaefthymiou, PhD, Villanova University

 

Magnetic particles of single- or sub-single magnetic domain size are being exploited in a wide range of nano- and bio-technological applications due to the tailoring of their magnetic properties through size, shape and surface structural manipulation as well as composition and degree of crystallinity. To this end synthetic approaches must always be combined with thorough micromagnetic characterization of the derived nanostructures at different measuring time windows (τm) due to the presence of superparamagnetism and other dynamic spin relaxation phenomena at the nanoscale. In this talk some fundamental aspects of nanomagnetism will be presented along with the power afforded by the combination of SQUID (τm= 100 s) and Mössbauer (τm= 10 ns) measurements in the magnetic and electronic characterization of iron based nanosystems, both isolated and interacting, including their intrinsic spin structure as influenced by surface and finite-size effects. The approach will be demonstrated with examples from biologically or chemically derived iron-oxide and ferrite nanostructures with applications in nanomedicine and radio-frequency devices.

Contact Information

Christina Love, PhD
love@drexel.edu