Abstract
A diode, a device allowing unidirectional signal transmission, is a fundamental element of logic structures and lies in the heart of modern information systems. Spin wave or magnon, representing a collective quasi-particle excitation of the magnetic order in magnetic materials, is a promising candidate of information carrier for the next generation energy-saving technologies. Here we propose a scalable and reprogrammable pure spin wave logic hardware architecture using domain walls and surface anisotropy stripes as waveguides on a single magnetic wafer. We demonstrate theoretically the design principle of the simplest logic component, a spin wave diode, utilizing the chiral bound states in a magnetic domain wall with Dzyaloshiskii-Moriya interaction, and confirm its performance through micromagnetic simulations. Our findings open a new vista for realizing different types of pure spin wave logic components and finally achieving an energy-efficient and hardware-reprogrammable spin wave computer.
Highlights
In the post silicon era, Moore’s law is not sustainable, partly because of the power consumption caused by the Joule heating from the electric current
We demonstrate theoretically the design principle of the simplest logic component, a spin-wave diode, utilizing the chiral bound states in a magnetic domain wall with a Dzyaloshinskii-Moriya interaction, and confirm its performance through micromagnetic simulations
We propose a design of the spin-wave diode utilizing the spatial separation of the spin-wave bound states caused by the Dzyaloshinskii-Moriya interaction (DMI) [15,16] within a magnetic domain wall
Summary
In the post silicon era, Moore’s law is not sustainable, partly because of the power consumption caused by the Joule heating from the electric current. To avoid the unmanageable power dissipation, scientists have been trying to use various (quasi)particles other than electrons as information carriers, such as photons in photonics [1], electron spin in spintronics [2], phonons in phononics [3,4], and spin waves in magnonics [5,6,7,8] Among these efforts, magnonics, which can be realized in insulators, is interesting mainly because of its energy-saving benefit since spin waves produce no Joule heating. New magnonics hardware architecture designs, as we propose below, allow magnonics to be realized on a single magnetic thin film—a magnetic wafer using its “soft” magnetic structures Such an integrated spin-wave circuit is reprogrammable by repatterning the magnetic texture. The functionality of this reprogrammable spinwave diode is confirmed by micromagnetic simulations
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