Seminar on Wedn. 14 December (errata corrige)

[ivanisse]

CONDENSED MATTER AND STATISTICAL PHYSICS SEMINAR

INFORMAL SEMINAR

Wednesday, 14 December-16:00 hrs.

Luigi Stasi Seminar Room - Leonardo Bldg. - 1st floor

Angela Burlamaqui Klautau ( Universidade Federal do Pará, Belém, Brazil )

" Nanostructures on metallic surfaces: novel magnetic properties "

Abstract

The magnetic properties of nanostructures supported on metallic surfaces 
are of great interest, both because of the possibilities of atomic 
engineering of future spintronic devices, as well as due to the fact 
that such systems challenge our understanding of magnetism in general. 
Here, our research on the magnetic properties of nano-sized objects 
adsorbed on different substrates will be reviewed. Such theoretical 
investigations were performed using DFT (Density Functional Theory) 
based method, which is appropriate to treat complex magnetic structures 
[1]. From nanowires to corrals, we have explored the possibility of the 
occurrence of novel magnetic behaviors. A systematic study of the 
occurrence of noncollinear magnetism is presented, by changing the 
geometry of the supported nanostructures, where intriguing noncollinear 
magnetic ordering were obtained for Mn nanostructures adsorbed on 
Pt(111) [2], Fe(001) and W(001) surfaces. In particular, for Mn corrals 
on Pt(111) surfaces we identified a nano­object presenting very complex 
stable magnetic configurations, which can be described by topological 
structures, as Skyrmions, in analogy to Z_2 vortex­like structures [2]. 
Also, for Mn nanostructures on Fe(001) the effect of spin-orbit coupling 
lead to the possibility of half skyrmion.Concerning metallic nanowires 
of Mn on W(001), we show the possibility of realizing complex 
noncollinear magnetic structures such as helical spin spiral.

[1]A. Bergman, L. Nordström, A. B. Klautau, S. Frota­Pessôa and 
O.Eriksson, Phys. Rev. B 73, 174434 (2006); Phys. Rev. B 75, 224425 (2007).

[2] M. S. Ribeiro,G. B. Corrêa Jr.,A. Bergman,L. Nordström, O. 
Eriksson,and A. B. Klautau, Phys. Rev. B 83, 014406 (2011).