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We have studied the magnetic properties of (GaMnAs) m (GaAs) n superlattices with magnetic GaMnAs layers of thickness between eight and 16 molecular layers (ML) (23-45 Å), and with non-magnetic GaAs spacers from 4 to 10 ML (11-28 Å). While previous reports state that GaMnAs layers thinner than 50 Å are paramagnetic in the whole Mn composition range achievable using MBE growth (up to...
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