Physical synthesis of Ni@CoO core@shell nanoparticles: fine analysis and tuning of magnetic properties.
underline D'Addato S., Spadaro M.C, Luches P., Benedetti F., Valeri S., Turchini S., Bertoni G., Ferretti A. M., Capetti E., Ponti A.
Precise synthesis of nanostructures is a fundamental issue in the realization of new functional materials. Physical synthesis of core@shell nanoparticles (NP) with gas condensation methods offers significant advantages with respect to chemical routes, as it is generally single-step, and it can produce ligand-free NP in a clean environment. We present the results on Ni@CoO core@shell NP films realized with a sequential layer deposition method. Fine microscopic (TEM, STEM) and spectroscopic (XPS XMCD) analyses were carried out together with magnetometry performed with SQUID, demonstrating the possibility of tuning the magnetic properties by an accurate control of the NP growth parameters.