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Parallel Matrix Multiplication Using Voltage-Controlled Magnetic Anisotropy Domain Wall Logic

IEEE Journal on Exploratory Solid-State Computational Devices and Circuits

Zogbi, Nicholas; Liu, Samuel; Bennett, Christopher H.; Agarwal, Sapan A.; Marinella, Matthew J.; Incorvia, Jean A.C.; Xiao, Tianyao X.

The domain wall-magnetic tunnel junction (DW-MTJ) is a versatile device that can simultaneously store data and perform computations. These three-terminal devices are promising for digital logic due to their nonvolatility, low-energy operation, and radiation hardness. Here, we augment the DW-MTJ logic gate with voltage-controlled magnetic anisotropy (VCMA) to improve the reliability of logical concatenation in the presence of realistic process variations. VCMA creates potential wells that allow for reliable and repeatable localization of domain walls (DWs). The DW-MTJ logic gate supports different fanouts, allowing for multiple inputs and outputs for a single device without affecting the area. We simulate a systolic array of DW-MTJ multiply-accumulate (MAC) units with 4-bit and 8-bit precision, which uses the nonvolatility of DW-MTJ logic gates to enable fine-grained pipelining and high parallelism. The DW-MTJ systolic array provides comparable throughput and efficiency to state-of-the-art CMOS systolic arrays while being radiation-hard. These results improve the feasibility of using DW-based processors, especially for extreme-environment applications such as space.

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Hugoniot, sound speed, and phase transitions of single-crystal sapphire for pressures 0.2-2.1 TPa

Physical Review B

McCoy, C.A.; Laros, James H.; Knudson, Marcus D.; Desjarlais, Michael P.; Duwal, Sakun D.; Root, Seth R.

Sapphire (Al2O3) is a major constituent of the Earth's mantle and has significant contributions to the field of high-pressure physics. Constraining its Hugoniot over a wide pressure range and identifying the location of shock-driven phase transitions allows for development of a multiphase equation of state and enables its use as an impedance-matching standard in shock physics experiments. Here, we present measurements of the principal Hugoniot and sound velocity from direct impact experiments using magnetically launched flyers on the Z machine at Sandia National Laboratories. The Hugoniot was constrained for pressures from 0.2-2.1 TPa and a four-segment piecewise linear shock-velocity-particle-velocity fit was determined. First-principles molecular dynamics simulations were conducted and agree well with the experimental Hugoniot. Sound-speed measurements identified the onset of melt between 450 and 530 GPa, and the Hugoniot fit refined the onset to 525±13 GPa. A phase diagram which incorporates literature diamond-anvil cell data and melting measurements is presented.

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Compaction of crushed salt for the safe containment – Overview of Phase 2 of the KOMPASS project

Friedenberg, Larissa; Czaikowski, Oliver; Lerch, Christian; Muller Hoeppe, Nina; Rahmig, Michael; Bartol, Jeroen; Dusterloh, Uwe; Lerche, Svetlana; Saruulbayar, Nachinzorig; Lippmann-Pipke, Johanna; Laurich, Ben; Svensson, Kristoff; Zemke, Kornelia; Thiedau, Jan; Liu, Wenting; Gartzke, Anne; Popp, Till; Ludeling, Christoph; Rolke, C.; Rabbel, Ole; Reedlunn, Benjamin R.; Laros, James H.; Mills, Melissa M.; Coulibaly, Jibril B.; Spiers, Chris; De Bresser, Hans; Hangx, Suzanne; Van Oosterhout, Bart

Abstract not provided.

Results 1201–1300 of 96,771
Results 1201–1300 of 96,771