Effect of a ferromagnetic STM cobalt tip on a single Co-phthalocyanine molecule adsorbed on a ferromagnetic substrate

The effect of a ferromagnetic scanning tunneling microscope (STM) cobalt tip on the electronic, magnetic and electronic transport properties Co-phthalocyanine (CoPc)/Co(111) junction has been investigated in framework density functional theory conjunction with Landauer non-equilibrium Green function formalism. It is shown that spin moment CoPc molecule can be flipped by varying distance between STM when passing from regime to contact regime. Our calculations show such flip leads change sign Tunneling Magneto-Resistance ratio (TMR). also large changes total spin-polarized I–V characteristics.