Spin susceptibility of surface nanosystems affected by spatially localized external magnetic influence.

We suggest a theoretical approach for registration of spatially localized external magnetic influence (SLEMI) on surface nanosystems by means of longitudinal spin susceptibility. This approach is tested on the system of antiferromagnetically coupled adatom dimers, which are connected to each other through ferromagnetic exchange. By full diagonalization of hybrid quantum-classical Heisenberg model it was shown that switching the direction of the «classical» dimer (as a result of SLEMI in our consideration) causes qualitative change in the system, which could be observed at longitudinal susceptibility spectrum. It states this characteristic to be additional one to single adatom magnetization, which can serve as an indicator of SLEMI during transmitting process or as an output channel for spin logic gates. [ABSTRACT FROM AUTHOR]