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We demonstrate using inelastic scanning tunneling spectroscopy (ISTS) andsimulations based on density functional theory that the amplitude and sign ofthe magnetic anisotropy energy for a single Fe atom adsorbed onto the Pt(111)surface can be manipulated by modifying the adatom binding site. Since themagnitude of the measured anisotropy is remarkably small, up to an order ofmagnitude smaller than previously reported, electron-hole excitations are weakand thus the spin-excitation exhibits long lived precessional lifetimescompared to the values found for the same adatom on noble metal surfaces.

Spin excitations of individual Fe atoms on Pt(111): impact of the site-dependent giant substrate polarization