Semiconductor quantum dots (QDs) have been extensively studied because of their potential to be used in devices such as highly efficient semiconductor lasers or qubits for quantum computation. Furthermore, it is expected that the low-dimensional confinement of carriers in ferromagnetic QDs allows a highly effective gate-voltage control of their magnetic properties and Curie temperature (TC)1. Another possible application of ferromagnetic QDs is single electron spin transistors (SEST)2 which provide a building block for reconfigurable logic circuits that have extremely low-power consumption. For these applications, ferromagnetic QDs with high TC and good compatibility with semiconductor platforms are essential. Ferromagnetic semiconductors such as (Ge,Fe)Sb3 are good candidates.
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