1. CNR—Institute for Microelectronics and Microsystems, Via C. Olivetti 2, 20864 Agrate Brianza, Italy
2. CNR—Institute of Materials for Electronics and Magnetism, Parco Area delle Scienze, 7/A, 43124 Parma, Italy
3. CNR—Institute for Microelectronics and Microsystems, Via del Fosso del Cavaliere, 100, 00133 Rome, Italy