Baublitz M, Lane C, Lin Hsin, Hafiz Hasnain, Markiewicz R S, Barbiellini B, Sun Z, Dessau D S, Bansil A
1] Physics Department, Northeastern University, Boston MA 02115, USA [2] College of General Studies, Boston University, Boston MA 02215, USA.
Physics Department, Northeastern University, Boston MA 02115, USA.
Sci Rep. 2014 Dec 19;4:7512. 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 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.
由于材料中的半金属性在自旋电子学中有潜在应用，它已成为广泛研究的主题。铁磁锰氧化物被视为一个很好的候选材料，除了在La(2 - 2x)Sr(1 + 2x)Mn(2)O(7)（x = 0.38）中观察到的一个小的少数自旋口袋外，输运测量表明铁磁锰氧化物基本上表现得像半金属。在这里，我们开发了稳健的紧束缚模型来描述铁磁、自旋倾斜反铁磁和完全反铁磁双层锰氧化物的多数以及少数自旋态的电子能带结构。MnO2平面之间的双层耦合以及|x(2) - y(2)>和|3 z(2) - r(2)> Mn 3d轨道的混合在双层分裂的微妙行为中都起着重要作用。包括了kz色散的影响。
