We show that isolated magnetic dipoles
centred at the position of manganese impurities in a gallium arsenide lattice
lead to spin polarized states in the bandgap of the III–V semiconductor.
Spectroscopy simulations with a tungsten tip agree well with experimental data;
in this case, no difference can be observed for the two magnetic groundstates.
But if the signal is read with a magnetic iron tip, it changes by a factor of
up to 20, depending on the magnetic orientation of the Mn atom.
Source:IOPscience
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