Analysis of Switching Energy and Delay for Magnetic Logic Devices

Magnetic logic is considered as one of the alternate technologies to the existing CMOS engineering in designing digital logic circuits. In magnetic logic, the spin directions are considered as logic levels instead of electric charge used in CMOS modules. If magnetic dots are suitably arranged, antiferromagnetic and ferromagnetic coupling can be utilized to represent a digital circuit. In this paper, we have studied different shapes of magnetic material such as ellipsoidal, funnel, dome, d, rectangle, and pacman to determine the magnetic interplay between the input and other arranged logical dots. The logical operation is dependent on the parity and the overall assembly of dots. All the selected shapes in this study, exhibited ferromagnetic and antiferromagnetic coupling between the dots, which wasfurther employed to design inverter digital circuit. A comparative analysis in terms of switching energy, and propogation delay were investigated for inverter logic design. Among all the selected shapes, the ellipsoidal profile was best suited to develop digital circuits with respect to energy-delay product. The performance of a multiplexer circuit consisting of AND and OR logic output was investigated using ellipsoidal and rectangular shaped ferro-magnetic dots.