As scaling of CMOS technology is approaching its fundamental limits, the necessity to find innovative beyond-CMOS alternatives is becoming more and more urgent. Spintronics provides interesting technological solutions due to its inherent low-power and non-volatility. Using magnetic domains to represent the logic levels `1’ and `0’, spin-based logic gates can be built to perform Boolean operations. One particular technology is the Spin-torque Majority Gate. Here, magnetic domain walls are nucleated, then merge and propagate to the output before cascading to the next node. To further boost STMG performance, it is imperative to investigate new physics for magnetization reversal and dynamics, such as Spin-Orbit torques, Magnetoelectricity, Antiferromagnetism, etc.
Besides Boolean logic, magnetic devices can be used for an even more dramatic scaling of logic circuits, achieving a complex functionality with a small number of components. For example, spin wave interference can be utilized to build a spectrum analyzer; spin-torque oscillators can be employed as image recognition filters, and domain walls could prove useful for bio-inspired circuits. The recent boom of these disruptive spin logic concepts shows a path towards a beyond-CMOS future, where various technologies will be particularly efficient for several specific applications.
The purpose of this PhD project is to perform micromagnetic simulations in order to validate, down-select and benchmark various spin logic concepts. The candidate will focus on the physical interpretation of the simulations. This will allow to determine the limitations of the technology but more importantly, to define how this concept could be employed into new devices. In this avenue, the candidate will also have the opportunity to propose entirely new spin logic concepts that will be assessed in terms of speed, energy and scalability.
A strong background in solid-state physics is required as well as excellent analytical skills. The candidate will carry out this PhD with a proactive and independent mindset. This work is intersectoral and the candidate will interact with many teams at imec to provide insightful feedback on design and modelling of future spin-logic concepts.
Supervisor: Marc Heyns
Daily advisors: Adrien Vaysset, Odysseas Zografos
The reference code for this PhD position is STS1712-04. Mention this reference code on your application form.