A self-consistent calculation of the density of states and the spectral density function is performed in a two-dimensional spin-polarized hole system based on a multiple-scattering approximation. Using parameters corresponding to GaMnAs thin layers, a wide range of Mn concentrations and hole densities have been explored to understand the nature, localized or extended, of the spin-polarized holes at the Fermi level for several values of the average magnetization of the Mn system. The authors show that, for a certain interval of Mn and hole densities, an increase on the magnetic order of the Mn ions come together with a change of the nature of the states at the Fermi level. This fact provides a delocalization of spin-polarized extended states antialigned to the average Mn magnetization and a higher spin polarization of the hole gas. This nonmetal-to-metal transition caused by the increase of Mn concentration once the ferromagnetic phase is reached was observed experimentally since the first samples were produced. These results are consistent with the occurrence of ferromagnetism with relatively high transition temperatures observed in some thin film samples and multilayered structures of this material.
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2 April 2007
Research Article|
April 06 2007
On the nature of the spin-polarized hole states in a quasi-two-dimensional GaMnAs ferromagnetic layer
E. Dias Cabral;
E. Dias Cabral
Institute de Física,
Universidade do Estado do Rio de Janeiro
, 20500-013 Rio de Janeiro, Rio de Janeiro, Brazil
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M. A. Boselli;
M. A. Boselli
a)
Departamento de Física,
Universidade Federal de Ouro Preto
, 35400-000 Ouro Preto, Minas Gerais, Brazil
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A. T. da Cunha Lima;
A. T. da Cunha Lima
Universidade Veiga de Almeida
, 28905-970 Cabo Frio, Rio de Janeiro, Brazil
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A. Ghazali;
A. Ghazali
b)
Institut des NanoSciences de Paris
, 75015 Paris, France
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I. C. da Cunha Lima
I. C. da Cunha Lima
Instituto de Física,
Universidade do Estado do Rio de Janeiro
, 20500-013 Rio de Janeiro, Rio de Janeiro, Brazil and Departamento de Física, Universidade Federal de Ouro Preto
, 35400-000 Ouro Preto, Minas Gerais, Brazil
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E. Dias Cabral
M. A. Boselli
a)
A. T. da Cunha Lima
A. Ghazali
b)
I. C. da Cunha Lima
Institute de Física,
Universidade do Estado do Rio de Janeiro
, 20500-013 Rio de Janeiro, Rio de Janeiro, Brazila)
Electronic mail: [email protected]
b)
Deceased.
Appl. Phys. Lett. 90, 142118 (2007)
Article history
Received:
January 26 2007
Accepted:
March 07 2007
Citation
E. Dias Cabral, M. A. Boselli, A. T. da Cunha Lima, A. Ghazali, I. C. da Cunha Lima; On the nature of the spin-polarized hole states in a quasi-two-dimensional GaMnAs ferromagnetic layer. Appl. Phys. Lett. 2 April 2007; 90 (14): 142118. https://doi.org/10.1063/1.2721129
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