Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Tuning of the average p - d exchange in (Ga,Mn)As by modification of the Mn electronic structure

Tuning of the average p - d exchange in (Ga,Mn)As by modification of the Mn electronic structure An important parameter of the ferromagnetism of (Ga,Mn)As alloys is the average p - d exchange integral N 0 β since the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction parameter J RKKY ∝ ( N 0 β ) 2 . We prove, by a detailed study of p -type Ga 1 − x Mn x As and n -type Ga 1 − x Mn x As : Te ( x < 0.005 ) in the paramagnetic phase, that the magnitude and sign of N 0 β are strongly dependent on the local electronic configuration of the Mn ions. We find N 0 β > 0 (ferromagnetic coupling) in p -type samples where the local Mn configuration is Mn Ga 0 ( 3 d 5 + hole ) . In n -type samples, N 0 β < 0 (antiferromagnetic coupling) with the local Mn configuration being Mn Ga − ( 3 d 5 ) . The average N 0 β in (Ga,Mn)As is not a material constant as widely believed. It can be tuned and can even change its sign, depending on the doping conditions of the Mn-containing layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Tuning of the average p - d exchange in (Ga,Mn)As by modification of the Mn electronic structure

Download PDF
4 pages

Loading next page...
 
/lp/american-physical-society-aps/tuning-of-the-average-p-d-exchange-in-ga-mn-as-by-modification-of-the-PJF9WNJTiV

References (30)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2004 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.70.233201
Publisher site
See Article on Publisher Site

Abstract

An important parameter of the ferromagnetism of (Ga,Mn)As alloys is the average p - d exchange integral N 0 β since the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction parameter J RKKY ∝ ( N 0 β ) 2 . We prove, by a detailed study of p -type Ga 1 − x Mn x As and n -type Ga 1 − x Mn x As : Te ( x < 0.005 ) in the paramagnetic phase, that the magnitude and sign of N 0 β are strongly dependent on the local electronic configuration of the Mn ions. We find N 0 β > 0 (ferromagnetic coupling) in p -type samples where the local Mn configuration is Mn Ga 0 ( 3 d 5 + hole ) . In n -type samples, N 0 β < 0 (antiferromagnetic coupling) with the local Mn configuration being Mn Ga − ( 3 d 5 ) . The average N 0 β in (Ga,Mn)As is not a material constant as widely believed. It can be tuned and can even change its sign, depending on the doping conditions of the Mn-containing layer.

Journal

Physical Review B – American Physical Society (APS)

Published: Dec 15, 2004

There are no references for this article.