Mn-doped (formula presented) chalcopyrites

An ab initio study of ferromagnetic semiconductors

Silvia Picozzi, Yu Jun Zhao, Arthur J Freeman, Bernard Delley

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Stimulated by our recent findings suggesting that the (formula presented) chalcopyrites could be a different class of ferromagnetic semiconductors, we performed first-principles calculations within density-functional theory and the generalized gradient approximation for Mn-doped (formula presented) Our calculations confirm the previous theoretical predictions on (formula presented) that the ferromagnetic spin configuration is strongly favored. Mn is found to be, as expected, both a source of localized magnetic moments and an acceptor; thus, our results seem to support the general idea that ferromagnetism is stabilized through a carrier-mediated interaction. For all the systems, we find a half-metallic character, consistent with the integer value of the total magnetic moment of (formula presented) per Mn atom. This is particularly important for spin-injection applications: in a significant energy range (i.e., about 0.5 eV in the dilute case) around the Fermi level relevant for spin injection, the holes will have a well-defined spin. A simple Heisenberg model to estimate the Curie temperature (formula presented) in ordered (formula presented) alloys gives (formula presented) therefore suggesting the possible importance of this class of ferromagnetic semiconductors for spintronic applications.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number20
DOIs
Publication statusPublished - Jan 1 2002

Fingerprint

Magnetic moments
Semiconductor materials
Magnetoelectronics
Ferromagnetism
Curie temperature
Fermi level
Density functional theory
Atoms
magnetic moments
injection
chalcopyrite
ferromagnetism
integers
density functional theory
gradients
estimates
configurations
predictions
approximation
atoms

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mn-doped (formula presented) chalcopyrites : An ab initio study of ferromagnetic semiconductors. / Picozzi, Silvia; Zhao, Yu Jun; Freeman, Arthur J; Delley, Bernard.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 66, No. 20, 01.01.2002, p. 1-6.

Research output: Contribution to journalArticle

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AB - Stimulated by our recent findings suggesting that the (formula presented) chalcopyrites could be a different class of ferromagnetic semiconductors, we performed first-principles calculations within density-functional theory and the generalized gradient approximation for Mn-doped (formula presented) Our calculations confirm the previous theoretical predictions on (formula presented) that the ferromagnetic spin configuration is strongly favored. Mn is found to be, as expected, both a source of localized magnetic moments and an acceptor; thus, our results seem to support the general idea that ferromagnetism is stabilized through a carrier-mediated interaction. For all the systems, we find a half-metallic character, consistent with the integer value of the total magnetic moment of (formula presented) per Mn atom. This is particularly important for spin-injection applications: in a significant energy range (i.e., about 0.5 eV in the dilute case) around the Fermi level relevant for spin injection, the holes will have a well-defined spin. A simple Heisenberg model to estimate the Curie temperature (formula presented) in ordered (formula presented) alloys gives (formula presented) therefore suggesting the possible importance of this class of ferromagnetic semiconductors for spintronic applications.

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