Model of Anisotropic Magnetization of In(1x)Mn(x)S: Comparison to Experiment
Abstract
Calculations of and experimental results for the anisotropic magnetization of the new IIIVI dilute magnetic semiconductor, In(1x)Mn(x)S, are presented. The model Hamiltonian incorporates the interaction of the incomplete shell of Mn 3delectrons with the crystal lattice within the pointion approximation. Other terms in the Hamiltonian include the Zeeman interaction, the spinorbit and the spinspin terms. It is assumed the Mn atoms do not interact with each other (this is the singlet model, which is appropriate when x is small, here 2%). The temperature and field dependent magnetization is found from the energy eigenvalues of the Hamiltonian matrix, which was expressed in terms of an uncoupled angular momentum basis set. Magnetization versus temperature results are found for several field values, B, pointing along various directions relative to the underlying dilute magnetic semiconductor crystal lattice. In addition, the magnetization versus field is computed for several fixed temperatures and for various Bfield directions and magnitudes. Overall, the agreement of this simple model with the experimental data is very good except at low temperatures (< 20 K) and high fields (> a few Tesla). It would be useful for quantitative comparison purposes to have optical absorption data in order to better fix the crystal potential parameters that are input parameters in the theory. In addition, the model could be improved by going beyond the pointion approximation to better model the covalent bonds in the crystal.* Supported by UNF Research Grants, Research Corporation Award, CC4845, NSF Grant Nos. DMR0305653, DMR0102699, and ECS0129853 and Donors of the American Chemical Society Petroleum Research Fund PRF#40209B5M, and a Purdue Univ. Academic Reimbursement Grant.
 Publication:

APS March Meeting Abstracts
 Pub Date:
 March 2004
 Bibcode:
 2004APS..MARV27011G