Kirtley, J. R.Koch, R. H.Sun, ShouhengWoods, S. I.2004-12-032004-12-0320012001http://hdl.handle.net/2003/118110.17877/DE290R-11005enThe American Physical SocietyPhysical Review Letters530Direct Investigation of Superparamagnetism in Co Nanoparticle Films10.1103/PhysRevLett.87.137205article (journal)