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Antiferromagnetic Exchange Constants Between Mn2+ Ions in II-VI Semimagnetic Semiconductors

Published online by Cambridge University Press:  26 February 2011

R. L. Aggarwal
R. L. Aggarwal*
Affiliation:
Francis Bitter National Magnet Laboratory and Department of Physics Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Mn2+ ion spins in II–VI compound semimagnetic semiconductors (SMS) such as Cd1−xMn Te interact with one another through an antiferromagnetic exchange which is responsible for many interesting properties of Mn-alloyed II–VI SMS. In particular, this interaction leads to unique magnetization (M) behavior of SMS as a function of applied magnetic field (B). The nearest-neighbor (NN) Mn2+ −MN2+ interaction has been shown to yield a series of five steps in M vs. B curves above about 10 T, providing a direct determination of the NN exchange constant JNN. A detailed analysis of the magnetization steps has yielded values for the next NN exchange constant JNNN. The magnetization steps also yield information on the distribution of Mn2+ ions. Inelastic neutron scattering and Raman scattering provide alternative methods for the direct determination of the exchange constants.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 89: Symposium Q – Diluted Magnetic (Semimagnetic) Semiconductors , 1986 , 7
Copyright
Copyright © Materials Research Society 1987

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