Diluted magnetic semiconductor nanoparticles fabricated by the Langmuir–Blodgett technique

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We report the first example of diluted magnetic semiconductor (DMS) fine particles incorporated into Langmuir-Blodgett (LB) films. Cd 1 -x Mn x S (x = 0.45, 0.27 and 0.20) fine particles with about a 3-nm diameter were prepared through the reaction of arachidate LB films containing Cd and Mn with hydrogen sulfide (HIS) in an atmosphere of NH 3 . Electron spin resonance (ESR) measurements, before and after HIS treatment, gave information on the microstructural changes which occurred in the film during particle formation. The anomalous broadening of the line shape and the anisotropic properties of quasi two-dimensional magnets were observed before H 2 S treatment, while, after HIS treatment, these characteristic features completely disappeared, and a typical exchange-narrowed line arose. The drastic changes observed here indicate that Cd 1-x Mn x S fine particles were produced in a spherical shape, not in a two-dimensional sheet.

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