Spin wave computing : a possible route towards novel logic

Orateur : Dr. Bart Sorée (IMEC, Belgium)

Abstract : The main idea behind wave computing is to make a paradigm shift in the way we design devices. Instead of making conventional devices that are part of a logic function, the goal is to make devices that already realize a logic function more functional than just an elementary switch. Wave computing may realize this and is based on using the informat ion carried by a wave such as amplitude, phase and frequency. The expectation is that one would need lessinterconnect as this is already part of the device (i.e. the realization of a complex logic function in one device removes the otherwise required local interconnect present in conventional CMOS logic). Spin wave computing uses magnonic excitations which result in magnetization waves(coined spin waves in literature) propagating in ferromagnetic materials (spin wave bus). In order to excite, manipulate and detect spin waves different possibilities exist : magnetic tunnel junctions, microwave antenna or magnetoelectric elements. Spin wave computation uses interference and phase manipulation to obtain the desired computational outcome. In this lecture, we start with a short introduction into the dynamics of magnetism in matter and the resulting spin wave theory and experimental verification thereof. In the second part of the lecture the application of spin waves for wave computing (logic) will be discussed and an overview of the current status of research and applications will be given.

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