August, 2006

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New Achievements in Magnetic Nanostructure

A research team headed by Prof. Liu Banggui from the Institute of Physics, CAS studied the magnetic character of magnetic nanostructures and the manipulation of their magnetizations. They found that because of the existing of giant uniaxial magnetic anisotropy, a spin in these systems must overcome a barrier to realize a directional reversal. Hence, they took into account the effect of transition-state barriers in terms of a Heisenberg model, and used the kinetic Monte Carlo (KMC) method to conduct simulation research on these nano-scale systems. For the nano-magnetism of the monatomic Co spin chains, they adopted experimental parameters concerned and obtained the results that are consistent with the experimental ones. By using the same method, they explored the magnetization reversal of nano-magnets with giant uniaxial anisotropy and the basic law behind the current controlled spin reversal. They clarified the mechanism of nano-magnetism of magnetic nanostructures with giant magnetic anisotropy, and found the mechanism and laws of manipulating the magnetization of these nano-magnets by applying appropriate spin-polarized currents.

Their work was published in Physical Review Letters ( Phys. Rev. Lett. 96, 217201 (2006)) -3

Structural Transition of the Molecular Self-assembly Symmetry Realized

A research team headed by Prof. Wan Lijun, Research Fellow from the Key Laboratory of the Molecular Nanostructure and Nanotechnology, the Institute of Chemistry, CAS, has realized the structural transition of the molecular self-assembly symmetry through a thermal-annealing process by successfully controlling the trans-to-cis isomerization. Their work has been published in Angewandte Chemie International Edition ( Angew Chem. Int. Ed. , 2006, 45, 3996 ĘC4000)

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