Intrinsic life-time and external manipulation of Neel states in antiferromagnetic adatom spins on semiconductor surfaces
Abstract
It has been proposed that antiferromagnetic Fe adatom spins on semiconductor Cu-N surfaces can be used to store information [S. Loth et al, Science 335, 196 (2012)]. Here, we investigate spin dynamics of such antiferromagnetic systems through Monte Carlo simulations. We find out the temperature and size laws of switching rates of N\'eel states and show that the N\'eel states can become stable enough for the information storage when the number of spins reaches to one or two dozens of the Fe spins. We also explore promising methods for manipulating the N\'eel states. These could help realize information storage with such antiferromagnetic spin systems.
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