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You searched for +publisher:"Purdue University" +contributor:("Dmitri E. Nikonov"). Showing records 1 – 2 of 2 total matches.

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Purdue University

1. Sharad, Mrigank. Energy efficient hybrid computing systems using spin devices.

Degree: PhD, Electrical and Computer Engineering, 2014, Purdue University

Emerging spin-devices like magnetic tunnel junctions (MTJ's), spin-valves and domain wall magnets (DWM) have opened new avenues for spin-based logic design. This work explored potential computing applications which can exploit such devices for higher energy-efficiency and performance. The proposed applications involve hybrid design schemes, where charge-based devices supplement the spin-devices, to gain large benefits at the system level. As an example, lateral spin valves (LSV) involve switching of nanomagnets using spin-polarized current injection through a metallic channel such as Cu. Such spin-torque based devices possess several interesting properties that can be exploited for ultra-low power computation. Analog characteristic of spin current facilitate non-Boolean computation like majority evaluation that can be used to model a neuron. The magneto-metallic neurons can operate at ultra-low terminal voltage of ∼20mV, thereby resulting in small computation power. Moreover, since nano-magnets inherently act as memory elements, these devices can facilitate integration of logic and memory in interesting ways. The spin based neurons can be integrated with CMOS and other emerging devices leading to different classes of neuromorphic/non-Von-Neumann architectures. The spin-based designs involve `mixed-mode' processing and hence can provide very compact and ultra-low energy solutions for complex computation blocks, both digital as well as analog. Such low-power, hybrid designs can be suitable for various data processing applications like cognitive computing, associative memory, and currentmode on-chip global interconnects. Simulation results for these applications based on device-circuit co-simulation framework predict more than ∼100x improvement in computation energy as compared to state of the art CMOS design, for optimal spin-device parameters. Advisors/Committee Members: Kaushik Roy, Kaushik Roy, Anand Raghunathan, Byunghoo Jung, Dmitri E. Nikonov.

Subjects/Keywords: Design; Electrical and Computer Engineering; Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sharad, M. (2014). Energy efficient hybrid computing systems using spin devices. (Doctoral Dissertation). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_dissertations/362

Chicago Manual of Style (16th Edition):

Sharad, Mrigank. “Energy efficient hybrid computing systems using spin devices.” 2014. Doctoral Dissertation, Purdue University. Accessed July 19, 2019. http://docs.lib.purdue.edu/open_access_dissertations/362.

MLA Handbook (7th Edition):

Sharad, Mrigank. “Energy efficient hybrid computing systems using spin devices.” 2014. Web. 19 Jul 2019.

Vancouver:

Sharad M. Energy efficient hybrid computing systems using spin devices. [Internet] [Doctoral dissertation]. Purdue University; 2014. [cited 2019 Jul 19]. Available from: http://docs.lib.purdue.edu/open_access_dissertations/362.

Council of Science Editors:

Sharad M. Energy efficient hybrid computing systems using spin devices. [Doctoral Dissertation]. Purdue University; 2014. Available from: http://docs.lib.purdue.edu/open_access_dissertations/362


Purdue University

2. Penumatcha, Ashish Verma. Towards building a prototype spin-logic device.

Degree: PhD, Electrical and Computer Engineering, 2016, Purdue University

Since the late 1980s, several key discoveries, such as Giant and Tunneling Magne- toresistance, and advances in magnetic materials have paved the way for exponentially higher bit-densities in magnetic storage. In particular, the discovery of Spin-Transfer Torque (STT) has allowed information to be written to individual magnets using spin-currents. This has replaced the more traditional Oersted-field control used in field-MRAMs and allowed further scaling of magnetic-memories. A less obvious con- sequence of STT is that it has made possible a logic-technology based on magnets controlled by spin-polarized currents. Charge-coupled Spin Logic (CSL) is one such device proposal that couples a giant spin Hall effect(GSHE) write-unit with a Mag- netic Tunnel Junction read-unit. Several theoretical reports have demonstrated that a CSL-style device can function as a fundamental building block for neuromorphic computing by harnessing the intrinsic properties of magnets. This thesis describes the working of a CSL device. Experimental progress towards building the individual components of CSL and also our efforts to integrate these components into a CSL prototype will be presented. In addition to the integration effort, this work also explores spin-injection from a GSHE metal to a nanoscale magnet through an intermediate non-magnetic metal. Our results indicate that with the right choice of intermediate layers, the spin-angular mo- mentum absorbed by the magnet can be increased without engineering the intrinsic spin Hall angle of the GSHE metal. Finally, this work also proposes a Schottky-barrier model to describe the current flow through low-dimensional semiconductors and uses it to extract the band gap of black-phosphorus thin-films in an attempt to characterize novel 2D-materials. Advisors/Committee Members: Joerg Appenzeller, Joerg Appenzeller, Zhihong Cheng, Supriyo Datta, Dmitri E. Nikonov.

Subjects/Keywords: Applied sciences; Black phosphorus; Giant spin Hall effect; Schottky barriers; Spin logic; Spintronics; Two dimensional materials; Electrical and Computer Engineering; Nanoscience and Nanotechnology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Penumatcha, A. V. (2016). Towards building a prototype spin-logic device. (Doctoral Dissertation). Purdue University. Retrieved from http://docs.lib.purdue.edu/open_access_dissertations/986

Chicago Manual of Style (16th Edition):

Penumatcha, Ashish Verma. “Towards building a prototype spin-logic device.” 2016. Doctoral Dissertation, Purdue University. Accessed July 19, 2019. http://docs.lib.purdue.edu/open_access_dissertations/986.

MLA Handbook (7th Edition):

Penumatcha, Ashish Verma. “Towards building a prototype spin-logic device.” 2016. Web. 19 Jul 2019.

Vancouver:

Penumatcha AV. Towards building a prototype spin-logic device. [Internet] [Doctoral dissertation]. Purdue University; 2016. [cited 2019 Jul 19]. Available from: http://docs.lib.purdue.edu/open_access_dissertations/986.

Council of Science Editors:

Penumatcha AV. Towards building a prototype spin-logic device. [Doctoral Dissertation]. Purdue University; 2016. Available from: http://docs.lib.purdue.edu/open_access_dissertations/986

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