1999 Volume 23 Issue 1_2 Pages 691-693
We report the formation of nanosize ferromagnetic MnAs dots on S-passivated GaAs by molecular beam epitaxy. The structural and magnetic properties of the dots have been characterized by high resolution scanning electron microscopy, and superconducting quantum interference device magnetometer. The average size and the density of these MnAs dots were 16.3nm and 2.3×1010/cm3 respectively. These dots show ferromagnetism at low temperature and the Curie temperature is lower than the bulk value.