Magnetic Circular Dichroism Studies of Carrier-Induced Ferromagnetism in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mrow><msub><mrow><mi mathvariant="normal">Ga</mi></mrow><mrow><mn>1</mn><mo>−</mo><mi mathvariant="italic">x</mi></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Mn</mi></mrow><mrow><mi mathvariant="italic">x</mi></mrow></msub></mrow><mo>)</mo><mi mathvariant="normal">As</mi></math></span>

B. Beschoten; P. A. Crowell; I. Malajovich; D. D. Awschalom; F. Matsukura; A. Shen; H. Ohno

doi:10.1103/PhysRevLett.83.3073

Magnetic Circular Dichroism Studies of Carrier-Induced Ferromagnetism in $({Ga}_{1 - x} {Mn}_{x}) As$

B. Beschoten, P. A. Crowell, I. Malajovich, D. D. Awschalom, F. Matsukura, A. Shen, and H. Ohno

Phys. Rev. Lett. 83, 3073 – Published 11 October 1999

Abstract

Magnetic circular dichroism is used to investigate the evolution of ferromagnetism in the $p$ -type magnetic semiconductor $({Ga}_{1 - x} {Mn}_{x}) As$ . Local Mn moments and holes produce two spectroscopically distinct contributions, whose properties reveal an antiferromagnetic Mn-hole alignment in the ferromagnetic state. These components are present in both metallic and insulating samples with different temperature and field dependences, suggesting that the holes play a more active role in mediating the ferromagnetic exchange than in traditional RKKY systems.

Received 19 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.3073

Authors & Affiliations

B. Beschoten¹, P. A. Crowell^1,2, I. Malajovich¹, and D. D. Awschalom¹

¹Department of Physics, University of California, Santa Barbara, California 93106
²School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455

F. Matsukura, A. Shen, and H. Ohno