Logic Devices with Spin Wave Buses - an Approach to Scalable Magneto-Electric Circuitry
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Logic Devices with Spin Wave Buses - an Approach to Scalable Magneto-Electric Circuitry Alexander Khitun1, Mingqiang Bao1, Yina Wu1, Ji-Young Kim1, Augustin Hong1, Ajey P Jacob2, Kosmas Galatsis1, and Kang L Wang1 1 Electrical Engineering, University of California Los Angeles, Los Angeles, CA, 900951594 2 TMG External Programs, Intel Corporation and Western Institute of Nanoelectronics, Los Angeles, CA, 90095-1594 ABSTRACT We analyze spin wave-based logic circuits as a possible route to building reconfigurable magnetic circuits compatible with conventional electron-based devices. A distinctive feature of the spin wave logic circuits is that a bit of information is encoded into the phase of the spin wave. It makes possible to transmit information as a magnetization signal through magnetic waveguides without the use of an electric current. By exploiting sin wave superposition, a set of logic gates such as AND, OR, and Majority gate can be realized in one circuit. We present experimental data illustrating the performance of a three-terminal micrometer scale spin wave-based logic device fabricated on a silicon platform. The device operates in the GHz frequency range and at room temperature. The output power modulation is achieved via the control of the relative phases of two input spin wave signals. The obtained data shows the possibility of using spin waves for achieving logic functionality. The scalability of the spin wavebased logic devices is defined by the wavelength of the spin wave, which depends on the magnetic material and waveguide geometry. Potentially, a multifunctional spin wave logic gate can be scaled down to 0.1µm2. Another potential advantage of the spin wavebased logic circuitry is the ability to implement logic gates with fewer elements as compared to CMOS-based circuits in achieving same functionality. The shortcomings and disadvantages of the spin wave-based devices are also discussed.
INTRODUCTION The rapid approach to the scaling limit of metal-oxide semiconductor field-effect transistor (MOSFET) has stimulated a great deal of interest to research alternative technologies, which may overcome the constrains inherent to CMOS-based circuitry and provide a route to more scalable and less power consuming logic devices. One of the most promising approaches is in the use of spin as a state variable. There is an impetus for the development of novel spin-based logic circuits that are aimed to provide high information/signal processing rates for lower power dissipation and scaleable to the nanometer range. Dipole-dipole and exchange interaction can be used for information transmission among spin-based devices without the use of an electric current. There are several approaches to spin-based devices such as Magnetic Cellular Automata [1], Domain-Wall Logic [2], and more recently devices with Spin Wave Bus [3]. In our preceding works [3-5], we have developed the general concept of logic circuits with Spin Wave Bus. Briefly, the basic idea to use magnetic films as spin conduit of wave propagatio
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