News Article
Manganese-doped Gallium Phosphide Has Been Found To Be Ferromagnetic Above
Manganese-doped gallium phosphide has been found to be ferromagnetic above
room temperature (Physical Review Letters, September 2, 2002) in work
carried out with collaboration between the University of Florida and Lucent
Technologies Bell Laboratories. The ferromagnetic property peaks at
3atomic%. While low temperature behaviour suggests ferromagnetism up to a
Curie temperature of 385K, the experimental value is 270K (below 0C).
Ferromagnetic clusters and hysteresis effects persist to at least 330K,
however. It is suggested that related materials such as InGaP and AlInGaP
might become ferromagnetic on manganese-doping. These materials are
frequently used in optoelectronics. Ferromagnetic behaviour in these
materials could be used to create polarised light.
Theoretical calculations at the University of Belarus suggest that excited
atoms placed in or near carbon nanotubes could increase the spontaneous
decay rate by up to six orders of magnitude over the same atom in vacuum
(Physical Review Letters, September 9, 2002). The increase is associated
with nonradiative decay processes through surface excitations in the
nanotube.
however. It is suggested that related materials such as InGaP and AlInGaP
might become ferromagnetic on manganese-doping. These materials are
frequently used in optoelectronics. Ferromagnetic behaviour in these
materials could be used to create polarised light.
Theoretical calculations at the University of Belarus suggest that excited
atoms placed in or near carbon nanotubes could increase the spontaneous
decay rate by up to six orders of magnitude over the same atom in vacuum
(Physical Review Letters, September 9, 2002). The increase is associated
with nonradiative decay processes through surface excitations in the
nanotube.
