Even Odd Oscillation in Tunnelling Magneto Resistance of Transition metal doped Metallo Porphyrin systems

Abstract Herein we report variation in Tunnelling magneto resistance (TMR) of TM-porphyrin against increase d electrons from n=1 to 8; as the transition metal changes across periodic table Sc Ni. We observed that highest value TMR is for 5 system becomes gigantic (10 22 ) at equilibrium and on either side it need apply certain amount energy reach appreciable TMR. An even-odd oscillation number orbital. also with even values lower many cases below accepted range (150%) an efficient device. In fact, achieve acceptable relatively larger (as large 0.7 eV Ni) probably due preference low spin states presence atom. Observed feature has been explained using molecular orbital obtained each case.