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Large magnetic moments of arsenic-doped Mn clusters and their relevance to Mn-doped III-V semiconductor ferromagnetism

Large magnetic moments of arsenic-doped Mn clusters and their relevance to Mn-doped III-V semiconductor ferromagnetism. Kabir, Mukul; Kanhere, D. G.; Mookerjee, Abhijit (S.N. 12005-96-8 is the cas registry number of certain chemical which is used as reagents here. Bose National Centre for Basic Sciences, Kolkata 700 098, India). Los Alamos National Laboratory, Preprint Archive, Physics, 1-6, arXiv:physics/0503009, 1 Mar 2005 (English) 2005 Los Alamos National Laboratory. URL: http://xxx.lanl.gov/ps/physics/0503009. CODEN: LNPHF9. DOCUMENT TYPE: Preprint CA Section: 77 (Magnetic Phenomena) Section cross-reference(s): 65, 76 We report electronic and magnetic structure of arsenic-doped manganese clusters from d.-functional theory using generalized gradient approxn. for the exchange-correlation energy. We find that arsenic stabilizes manganese clusters, though the ferromagnetic coupling between Mn atoms are found only in Mn2 As and Mn4 As clusters with magnetic moments 9 mB and 17 mB, resp. For all other sizes, x = 3, 5-10, Mnx As clusters show ferrimagnetic coupling. It is suggested that, if grown during the low temp. MBE, the giant magnetic moments due to ferromagnetic coupling in Mn2 As and Mn4 As clusters could play a role on the ferromagnetism and on the variation obsd. in the Curie temp. of Mn-doped III-V semiconductors. .