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Surface structures of the magnetostrictive D03-Fe3Ga(001) | | Ricardo Ruvalcaba
; J.P. Corbett
; Andrada-Oana Mandru
; N. Takeuchi
; Arthur R. Smith
; J. Guerrero-Sanchez
; | | Date: |
1 Jun 2020 | | Abstract: | First-principles total energy calculations and experimental measurements were
performed to study the surface reconstructions of the magnetostrictive Fe3Ga
alloy. The magnetostrictive behavior was evaluated in the bulk by compressing
and stretching its lattice parameter. Results demonstrate two thermodynamically
stable surfaces, the 1x1 and 3x1 reconstructions. The 1x1 is an ideally FeGa
terminated surface whereas the 3x1 is also FeGa terminated but it has a
first-layer Fe atom substituted by a Ga atom every three unit-cells, forming
stripe-like domain patterns. Tersoff-Hamann scanning tunneling microscopy
simulations were obtained and compared with experimental results. We found good
agreement between theory and experiment, in which the distance between rows is
~1.23 nm. The substrate-induced strain increases the stability of the 3x1
reconstruction. Here we have demonstrated that Ga/Fe atomic exchanges lead to
the stripe-like domain patterns. Clarification of the atomic reconstructions
present on the magnetostrictive Fe3Ga alloys is an important step towards the
understanding of its surfaces and poses this system as a potential candidate to
be used as part of perpendicular magnetic tunnel junctions due to the existing
perpendicular magnetic anisotropy effect when grown on different substrates. | | Source: | arXiv, 2006.0647 | | Services: | Forum | Review | PDF | Favorites | |
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