Inductively Coupled Circuits with Spin Wave Bus for Information Processing

摘要

We describe a new approach to logic devices interconnection by the inductivecoupling via a ferromagnetic film. The information among the distant devices istransmitted in a wireless manner via a magnetic field produced by spin wavespropagating in the ferromagnetic film, referred to as the spin wave bus. As analternative approach to the transistor-based architecture, logic circuits withspin wave bus do not use charge as an information carrier. A bit of informationcan be encoded into the phase or the amplitude of the spin wave signal. Wepresent experimental data demonstrating inductive coupling through the 100nmthick NiFe and CoFe films at room temperature. The performance of logiccircuits with spin wave bus is illustrated by numerical modeling based on theexperimental data. Potentially, logic circuits with spin wave bus may resolvethe interconnect problem and provide "wireless" read-in and read-out. Anotherexpected benefit is in the enhanced logic functionality. A set of NOT, AND, andOR logic gates can be realized in one device structure. The coupling betweenthe circuits and the spin wave bus can be controlled. We present the results ofnumerical simulations showing the controllable switching of a bi-stable logiccell inductively coupled to the spin wave bus. The shortcomings and limitationsof circuits with spin wave bus are also discussed.