title: A Minimal tight-binding model for ferromagnetic canted bilayer manganites.
abstract: Half-metallicity in materials has been a subject of extensive research due to its potential for applications in spintronics. Ferromagnetic manganites have been seen as a good candidate, and aside from a small minority-spin pocket observed in La(2-2x)Sr(1+2x)Mn(2)O(7) (x = 0.38), transport measurements show that ferromagnetic manganites essentially behave like half metals. Here we develop robust tight-binding models to describe the electronic band structure of the majority as well as minority spin states of ferromagnetic, spin-canted antiferromagnetic, and fully antiferromagnetic bilayer manganites. Both the bilayer coupling between the MnO2 planes and the mixing of the |x(2) - y(2) > and |3 z(2) - r(2) > Mn 3d orbitals play an important role in the subtle behavior of the bilayer splitting. Effects of kz dispersion are included.
authors.affiliation: 1] Physics Department, Northeastern University, Boston MA 02115, USA [2] College of General Studies, Boston University, Boston MA 02215, USA.
authors.forename: M
authors.initials: M
authors.lastname: Baublitz
authors.affiliation: Physics Department, Northeastern University, Boston MA 02115, USA.
authors.forename: C
authors.initials: C
authors.lastname: Lane
authors.affiliation: 1] Physics Department, Northeastern University, Boston MA 02115, USA [2] Graphene Research Centre and Department of Physics, National University of Singapore, Singapore 117542.
authors.forename: Hsin
authors.initials: H
authors.lastname: Lin
authors.affiliation: Physics Department, Northeastern University, Boston MA 02115, USA.
authors.forename: Hasnain
authors.initials: H
authors.lastname: Hafiz
authors.affiliation: Physics Department, Northeastern University, Boston MA 02115, USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Markiewicz
authors.affiliation: Physics Department, Northeastern University, Boston MA 02115, USA.
authors.forename: B
authors.initials: B
authors.lastname: Barbiellini
authors.affiliation: Department of Physics, University of Colorado, Boulder CO 80309, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Department of Physics, University of Colorado, Boulder CO 80309, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Dessau
authors.affiliation: Physics Department, Northeastern University, Boston MA 02115, USA.
authors.forename: A
authors.initials: A
authors.lastname: Bansil