Experimental Demonstration of a 1-Bit Full Adder in Perpendicular Nanomagnetic Logic

In this paper a 1-bit full adder realized in perpendicular nanomagnetic logic (pNML) is presented for the first time. The theory of NML with perpendicular magnetic anisotropy is introduced illustrating the great benefit of the universal majority decision. The working principle of complex logic circuits is experimentally demonstrated utilizing the presented full adder. Partial focused ion beam irradiation is used to control the anisotropy locally and tailor the magnetic behavior of the nanomagnets. A full adder structure consisting of 3 majority gates and 4 inverters is realized on an area of 17 um . Global, alternating field pulses with constant amplitude are used as power clock. MFM measurements demonstrate the functionality of the structure and the validity of the introduced theory. The presented work proves the working principle of non-volatile, field-coupled logic and demonstrates the feasibility of complex logic circuits in perpendicular nanomagnetic logic.