Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spinelectronics/Spininjection in Heterostructures

MA 10.14: Vortrag

Montag, 26. März 2007, 18:30–18:45, H23

Ferromagnetic interactions in Mn-doped magnetic semiconductors Ga(As,P) and (Al,Ga)As — •František Máca and Josef Kudrnovský — Institute of Physics ASCR, Praha, Czech Republic

The optimization of the host composition is one way for systematical theoretical search for new spintronic materials. In this contribution we study in detail the hole mediated ferromagnetism in Mn-doped Ga(As,P) and (Al,Ga)As. Mn incorporation in ternary hosts is investigated using ab initio electronic structure calculations based on the density functional theory. For a set of ordered ternary alloys we discuss the influence of lattice parameters as well as valence band off-set on the close neighbor exchange interactions. Our results predict an increase of Curie temperature for systems with larger amount of P, i.e. for materials with smaller lattice constant and with valence band edge closer to Mn d-states. For ternary alloys with a higher content of P also a reduced number of compensating impurities was predicted [1].

[1]J. Mašek at all. Phys. Rev. B (2006) in print.