The controlled switching between two quasi-stable Neel states in adsorbedanti-ferromagnetic Fe chains has recently been achieved by Loth et al [Science335, 196 (2012)]. In order to rationalize their data, we evaluate the rate oftunneling electron-induced switching between the N\'eel states. Good agreementis found with the experiment permitting us to identify three switchingmechanisms: (i) low-bias direct electron-induced transitions, (ii)intermediate-bias switching via spin-wave-like excitation, and (iii) high-biastransitions mediated by domain wall formation. Spin correlations in theanti-ferromagnetic chains are the switching driving force leading to a markedchain-size dependence.
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