Magnetic Circular Dichroism of a Dilute Ferromagnetic Alloy (ni-mn)
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چکیده
There is much interest and debate concerning the origin of ferromagnetism in dilute alloys of MnxGa1-xAs and other magnetically doped semiconductors [1]. The Mn acts as an acceptor introducing itinerant holes into the semiconductor. The ferromagnetic (FM) coupling between the magnetic Mn is thought to be via RKKY screening by the itinerant hole gas [2]. This coupling induces FM order at concentrations less than 10%, but increasing antiferromagnetic (AFM) disorder at higher concentrations. The Curie temperature TC increases to a maximum of a few hundred K at around 8% alloying. What has not been appreciated is that a similar behavior is observed in dilute alloys of
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تاریخ انتشار 2007