The developments in the field of nanotechnology made possible studies of the magnetic properties of the smallest artificially created nanostructures on metal surfaces: single magnetic atoms and their clusters. These systems exhibit interesting many-particle effects (collective magnetic excitations, substrate-mediated magnetic coupling, Kondo effect) and they may have potential applications in the field of data storage and data processing. I will briefly describe one of the main experimental tools in this field, the scanning tunneling microscope (STM) and its use for measuring magnetic properties at the single-atom level. It is possible to determine the spin of an adsorbed atom, its g-factor, the magnetic anisotropy D and E, the exchange interaction between pairs of adsorbed atoms, J, and the Kondo temperature. I will describe the Kondo impurity model which applies to these systems, the physics of the local momentum screening, and the role of the magnetic anisotropy. I will present the results for the Kondo resonance splitting in the magnetic field in the case of an adsorbate with spin S=3/2 and planar magnetic anisotropy, obtained using the numerical renormalization group techniques. The results agree well with recent experimental measurements in the system of cobalt adsorbed on a thin copper-nitride layer on the surface of copper.
Esta web utiliza cookies para la recolección de datos con un propósito estadístico. Si continúas navegando, significa que aceptas la instalación de las cookies.