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Electronic structure and magnetism of diluted magnetic semiconductors
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad materialfysik.ORCID-id: 0000-0003-4341-5663
Vise andre og tillknytning
2004 (engelsk)Inngår i: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 16, nr 48, s. S5481-S5489Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The electronic structure and magnetism of selected diluted magnetic semiconductors (DMS) is reviewed. It is argued that the effect of antisite defects plays an important role in the magnetism of DMS materials and that these defects lower the saturation moment and ordering temperature. We also show that the interatomic exchange of these materials is short ranged. By combining first principles calculations of interatomic exchange interactions with a classical Heisenberg model and Monte Carlo simulations, we show that-the observed critical temperatures of a broad range of diluted magnetic semiconductors, involving Mn-doped GaAs and GaN as well as Cr-doped ZnTe, are reproduced with good accuracy. We show that agreement between theory and experiment is obtained only when the magnetic atoms are randomly positioned on the Ga (or Zn) sites. This suggests that the ordering of DMS materials is heavily influenced by magnetic percolation and that the measured critical temperatures should be very sensitive to details in the sample preparation, in agreement with observations.

sted, utgiver, år, opplag, sider
2004. Vol. 16, nr 48, s. S5481-S5489
Emneord [en]
ferromagnetism, temperature, metals
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-39716DOI: 10.1088/0953-8984/16/48/002ISI: 000226025300003Scopus ID: 2-s2.0-10444284246OAI: oai:DiVA.org:kth-39716DiVA, id: diva2:444701
Konferanse
1st International Conference on Nanospintronics Design and Realization (ICNDR 2004). Kyoto, JAPAN. MAY 24-28, 2004
Merknad

QC 20110929

Tilgjengelig fra: 2011-09-29 Laget: 2011-09-12 Sist oppdatert: 2022-06-24bibliografisk kontrollert

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Bergqvist, LarsKorzhavyi, Pavel A.

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