Quasi-two-dimensional spin distributions in II-VI magnetic semiconductor heterostructures: Clustering and dimensionality

S. Crooker, N. Samarth

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Spin clustering in diluted magnetic semiconductors (DMS) arises from antiferromagnetic exchange between neighboring magnetic cations and is a strong function of reduced dimensionality. Epitaxially grown single monolayers and abrupt interfaces of DMS are, however, never perfectly two dimensional (2D) due to the unavoidable intermonolayer mixing of atoms during growth. Thus the magnetization of DMS heterostructures, which is strongly modified by spin clustering, is intermediate between that of 2D and 3D spin distributions. We present an exact calculation of spin clustering applicable to arbitrary distributions of magnetic spins in the growth direction. The results reveal a surprising insensitivity of the magnetization to the form of the intermixing profile, and identify important limits on the maximum possible magnetization. High-field optical studies of heterostructures containing “quasi-2D” spin distributions are compared with calculation.

Original languageEnglish (US)
Pages (from-to)1736-1739
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number3
DOIs
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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