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Narrowing and fine structure of the magnetization steps of dilute magnetic semiconductors in pulsed magnetic fields

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
71
Issue
5
Identifiers
DOI: 10.1016/0038-1098(89)90770-9

Abstract

Abstract Magnetization steps due to nearest-neighbor Mn 2+ pairs in Cd 0.977Mn 0.023S and Zn 0.97Mn 0.03S are much narrower in pulsed fields than expected from thermal broadening, and show a fine structure. These narrow steps imply a pair spin-lattice relaxation time much longer than 0.5 ms. An interpretation of the narrow steps, based on the Dzyaloshinski-Moriya interaction, is proposed. The nearest-neighbor exchange constant J NN for (Zn,Mn)S is JNN kb = -16.9 0.6 K . The effects of polytypism of J NN in (Zn,Mn)S are discussed. For (Cd,Mn)S, JNN kB = -9.65 0.2 K and -11.0 0.2 K , corresponding to two inequivalent NN's in the wurtzite structure.

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