A Minimal tight-binding model for ferromagnetic canted bilayer manganites

作者：Baublitz M; Lane C^*; Lin Hsin; Hafiz Hasnain; Markiewicz R S; Barbiellini B; Sun Z; Dessau D S; Bansil A

来源：Scientific Reports, 2014, 4(1): 7512.

DOI：10.1038/srep07512

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 La2-2xSr1+2xMn2O7 (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 vertical bar x(2) -y(2) > and vertical bar 3z(2) -r(2) > Mn 3d orbitals play an important role in the subtle behavior of the bilayer splitting. Effects of kz dispersion are included.

• 出版日期2014-12-19
• 单位东北大学