Issue
Europhys. Lett.
Volume 73, Number 5, March 2006
Page(s) 786 - 792
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI http://dx.doi.org/10.1209/epl/i2005-10456-8
Published online 25 January 2006
Europhys. Lett., 73 (5), pp. 786-792 (2006)
DOI: 10.1209/epl/i2005-10456-8

Spin-polarized hole transport through a diluted magnetic semiconductor heterostructure with magnetic-field modulations

K. Gnanasekar1 and K. Navaneethakrishnan2

1  The American College - Madurai-625 002, India
2  School of Physics, Madurai-Kamaraj University - Madurai-625 021, India

kgnnskr@yahoo.com
drknk2003@yahoo.co.in

received 25 October 2005; accepted in final form 10 January 2006
published online 25 January 2006

Abstract
We investigate the spin-polarized transport of holes in symmetric and asymmetric diluted magnetic semiconductor heterostructures of CdTe/Cd1-xMnxTe under local magnetic-field modulations. The effect of a type-I-to-type-II transition in the CdTe/Cd1-xMnxTe heterostructure is also used in our model. The spatially modulated magnetic field provides us with a new degree of freedom to control the degree of spin-polarized transport of holes. Our investigations show that spin-polarized transport of holes reaches 100% polarization with modulated weak magnetic field. This could be suitably engineered in the fabrication of perfect magnetic semiconductor spin-filters.

PACS
75.50.Pp - Magnetic semiconductors.
72.25.-b - Spin polarized transport.
73.40.Gk - Tunneling.

© EDP Sciences 2006