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Confinement-dependent ferromagnetism in Mn-doped InAs quantum dots embedded in InP nanowires: an ab initio study

Erika N. Lima ,  Tome M. Schmidt 

Universidade Federal de Uberlandia (UFU), Av Joao Naves de Avila, 2121, Uberlandia 38400902, Brazil

Abstract
Mn-doped InAs quantum dots (QDs) embedded in InP nanowires have been studied by first-principles calculations. The Mn-Mn ferromagnetic (FM) coupling is stronger in quantum dots than in nanowires and even greater than that of GaMnAs. We show that the ferromagnetic stability of Mn-doped InAs nanostructures is dependent on the confinement effects. InAs QDs embedded in InP NWs present stronger FM coupling than InAs bulk and NWs,  and it is even greater than that of GaMnAs [1]. The magnentic-phase stabilization is due to a strong AFM p-d exchange between the Mn 3d5 states and the hole bound to the magnetic impurity [2]. This AFM coupling is dependent on the quantum-confinement effect, resulting in a total FM coupling in QDs.  The magnetic coupling in these embedded QDs is a short-range one, presenting strong intradot Mn-Mn interaction and weaker interdot coupling.

References

[1] Marta Galicka et al. Nano letters 11, 3319 (2011)

[2] Gustavo Martini Dalpian et al. Solid State Communications 138, 353(2006)

 

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Presentation: Poster at 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17, Topical Session 2, by Erika N. Lima
See On-line Journal of 17th International Conference on Crystal Growth and Epitaxy - ICCGE-17

Submitted: 2013-04-12 13:15
Revised:   2013-04-12 13:16