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    COLLOQUIUM OF THE LABORATORY FOR COMPUTER DESIGN OF MATERIALS
        Institute for Computational Sciences and Informatics
	                      CSI 898-Sec 001  
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         Magnetism of Atomic Clusters and Their Assemblies

                             Shiv N. Khanna
   Physics Department, Virginia Commonwealth University, Richmond, Va. 
     
    Small atomic clusters continue to display newer and exciting
    Magnetic properties. Clusters of 3d ferromagnetic
    solids become paramagnetic domains with moments per atom enhanced 
    from the bulk. At small sizes, the moment changes discontinously 
    with size and the variations are intimately linked to the 
    electronic structure. Small clusters of non-magnetic solids are 
    magnetic with appreciable moments. Clusters of Gadolinium exhibit 
    strange variations of moments with size. While a gadolinium 
    molecule has the highest known spin moment per atom, the 
    clusters have markedly reduced moments. This variation is 
    associated with canting of atomic spins. Clusters of Mangenese 
    have attracted considerable attention due to quantum tunneling 
    and change in magnetic behavior with size. The talk will review 
    these developments and discuss some of the recent developments. 
    [1] S. N. Khanna and S. Linderoth, Phys. Rev. Lett. 67, 742 (1991)
    [2] B. V. Reddy, S. N. Khanna, and B. I. Dunlap, Phys. Rev. Lett. 
        70, 3323 (1991).
    [3] D. P. Pappas, A. P. Popov, A. N. Anisimov, B. V. Reddy
        and S. N. Khanna, Phys. Rev. Lett. 76, 4332 (1996).

	               Monday , September 29 1997
                                4:30 pm
                        Room 206, Science & Tech. I

Refreshments will be served.
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(http://www.csi.gmu.edu/lcdm/seminar/schedule.html)