John Holzrichter PhD dance
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Uploaded by gonzoscientist on Nov 16, 2008
John Holzrichter
President, Hertz Foundation
"Photo-magnetization in the Anti-ferromagnetic Mnf2"
Ph.D. Stanford University, 1971
Explanation of the science: Photos (laser) induce magnetization in an anti-ferromagnetic Mnf2 by exciting an exciton, or a coupled exciton-magnon, on one of the two sublattices. The change in magnetization is detected with a pick-up coil. The signals correspond to radiative and non-radiative induction and decays of the excited systems--optical exciton on one sublattice, coupled optical magnon-excitons, and their decay.
See Phys.Rev.Lett 26, 652 (1971)
Explanation of the dance: The dance represents a light particle (a photon) that enters a crystal made of manganese and fluorine (Mnf2). Each manganese atom in the crystal has a spin, indicated by hand-arm locations of dancers. As the crystal cools, the spins go from chaotic to neutral organization--horizontal arm motion. The photon (a single light quantum) enters into the crystal but is not "tuned right." As a result the spins are excited up and down, canceling any effect. However, the photon is "tuned" slightly by becoming more "green" and lo! It excites all the spins correctly leading to a strong but temporary magnet. The photon wins a PhD!!
Performed at the Hertz Foundation Fellowship retreat
Harvard Forest museum, 15 November 2008
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