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Understanding Order Dynamics in Magnetic and Ferroelectric Materials and Devices for Next Generation Computing
Understanding Order Dynamics in Magnetic and Ferroelectric Materials and Devices for Next ...
Understanding Order Dynamics in Magnetic and Ferroelectric Materials and Devices for Next Generation Computing

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자료유형  
 학위논문 서양
최종처리일시  
20260202105704
ISBN  
9798263308261
DDC  
530
저자명  
Shukla, Ankit.
서명/저자  
Understanding Order Dynamics in Magnetic and Ferroelectric Materials and Devices for Next Generation Computing
발행사항  
[Sl] : University of Illinois at Urbana-Champaign, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
283 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
주기사항  
Advisor: Rakheja, Shaloo.
학위논문주기  
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2024.
초록/해제  
요약The von Neumann computing architecture comprises three main components: memory, logic, and interconnect. Traditionally, improvements in logic and processor performance, namely increased speed, reduced power consumption, footprint and cost, accomplished by Moore's law---the continuous down scaling of physical dimensions of complementary metal oxide semiconductor (CMOS) transistors---have driven computing performance. On the other hand, recent advancements in silicon (Si)-based specialized hardware accelerators, such as graphics processor units (GPUs) and tensor processing units (TPUs), that can process information at a much faster rate than central processing units (CPUs), have helped revolutionize modern-day data-intensive applications like machine learning (ML), artificial intelligence (AI), big data, and the internet of things (IoTs). The next generation of computing, however, faces two main challenges. First, Moore's law is anticipated to slow down significantly by the end of this decade as Si reaches its fundamental limits, thereby limiting processor performance, including that of GPUs. Second, the `Memory wall', characterized by excessive time and power consumption in the transfer of large sets of data between memory and logic units, due to a performance gap between the processor and the main memory, poses a restriction on the overall performance of the system. Sustainable computing for the future requires investigating the physics of CMOS-compatible materials, followed by building novel devices, and architectures that co-locate memory and logic. These devices and architectures should be compact, fast, energy-efficient, and scalable with problem size. This work focuses on investigating the dynamics of emerging materials, including ferromagnets (FMs), antiferromagnets (AFMs), and doped hafnia-based ferroelectrics (FEs). Ferromagnetic materials are non-volatile, scalable down to nanometer (nm) size, and capable of exhibiting various dynamics in the megahertz (MHz) to gigahertz (GHz) range when driven by electric current. Nanoscale-sized magnetic tunnel junction (MTJ) devices, comprising two ferromagnetic layers sandwiching an insulator layer, are CMOS-compatible and can operate as a single-bit memory, source of random numbers, or signal generators. AFMs constitute another class of magnetically ordered materials with negligible net magnetization. When integrated into a tunnel junction device, they could potentially offer electric current-driven switching and oscillation dynamics in the terahertz (THz) regime. Hafnia-based FE materials form yet another category of CMOS-compatible materials that could exhibit switching dynamics in the hundreds of MHz frequency regime when driven by electric voltage. These materials can be utilized in ferroelectric tunnel junctions (FTJs) or in the gate stack of ferroelectric field-effect transistors (FEFETs), enabling the operation of multi-state tunable memory or sources of random numbers. The research presented encompasses three main themes: numerical modeling frameworks to investigate material dynamics, exploration of various dynamics and their dependence on material parameters and external stimuli, and leveraging these dynamics for developing CMOS-compatible and energy-efficient devices and circuits. In this context, FM and AFM dynamics are modeled using the Landau-Lifshitz Gilbert (LLG) equation to study current-driven switching and oscillation dynamics. Analytic models, in agreement with numerical results, are developed as a function of material parameters and external stimuli. On the device front, applications such as true random number generators and spiking neuron emulators are explored for FMs and AFMs, respectively. Additionally, the nucleation-limited switching (NLS) model is employed to investigate field-driven dynamics in FE materials and devices. Finally, a FE oscillator-based room temperature Ising machine circuit for solving combinatorial optimization problems is proposed.
일반주제명  
Condensed matter physics
일반주제명  
Materials science
일반주제명  
Electrical engineering
일반주제명  
Electromagnetics
키워드  
Spintronics
키워드  
Magnetism
키워드  
Ferroelectricity
키워드  
Ferroelectric materials
키워드  
Ferromagnets
키워드  
Antiferromagnets
키워드  
Modeling dynamics
기타저자  
University of Illinois at Urbana-Champaign Electrical & Computer Eng
기본자료저록  
Dissertations Abstracts International. 87-05B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aShukla,  Ankit.
■24510▼aUnderstanding  Order  Dynamics  in  Magnetic  and  Ferroelectric  Materials  and  Devices  for  Next  Generation  Computing
■260    ▼a[Sl]▼bUniversity  of  Illinois  at  Urbana-Champaign▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a283  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  B.
■500    ▼aAdvisor:  Rakheja,  Shaloo.
■5021  ▼aThesis  (Ph.D.)--University  of  Illinois  at  Urbana-Champaign,  2024.
■520    ▼aThe  von  Neumann  computing  architecture  comprises  three  main  components:  memory,  logic,  and  interconnect.  Traditionally,  improvements  in  logic  and  processor  performance,  namely  increased  speed,  reduced  power  consumption,  footprint  and  cost,  accomplished  by  Moore's  law---the  continuous  down  scaling  of  physical  dimensions  of  complementary  metal  oxide  semiconductor  (CMOS)  transistors---have  driven  computing  performance.  On  the  other  hand,  recent  advancements  in  silicon  (Si)-based  specialized  hardware  accelerators,  such  as  graphics  processor  units  (GPUs)  and  tensor  processing  units  (TPUs),  that  can  process  information  at  a  much  faster  rate  than  central  processing  units  (CPUs),  have  helped  revolutionize  modern-day  data-intensive  applications  like  machine  learning  (ML),  artificial  intelligence  (AI),  big  data,  and  the  internet  of    things  (IoTs).                        The  next  generation  of  computing,  however,  faces  two  main  challenges.  First,  Moore's  law  is  anticipated  to  slow  down  significantly  by  the  end  of  this  decade  as  Si  reaches  its  fundamental  limits,  thereby  limiting  processor  performance,  including  that  of  GPUs.  Second,  the  `Memory  wall',  characterized  by  excessive  time  and  power  consumption  in  the  transfer  of  large  sets  of  data  between  memory  and  logic  units,  due  to  a  performance  gap  between  the  processor  and  the  main  memory,  poses  a  restriction  on  the  overall  performance  of  the  system.  Sustainable  computing  for  the  future  requires  investigating  the  physics  of  CMOS-compatible  materials,  followed  by  building  novel  devices,  and  architectures  that  co-locate  memory  and  logic.  These  devices  and  architectures  should  be  compact,  fast,  energy-efficient,  and  scalable  with  problem  size.                        This  work  focuses  on  investigating  the  dynamics  of  emerging  materials,  including  ferromagnets  (FMs),  antiferromagnets  (AFMs),  and  doped  hafnia-based  ferroelectrics  (FEs).  Ferromagnetic  materials  are  non-volatile,  scalable  down  to  nanometer  (nm)  size,  and  capable  of  exhibiting  various  dynamics  in  the  megahertz  (MHz)  to  gigahertz  (GHz)  range  when  driven  by  electric  current.  Nanoscale-sized  magnetic  tunnel  junction  (MTJ)  devices,  comprising  two  ferromagnetic  layers  sandwiching  an  insulator  layer,  are  CMOS-compatible  and  can  operate  as  a  single-bit  memory,  source  of  random  numbers,  or  signal  generators.  AFMs  constitute  another  class  of  magnetically  ordered  materials  with  negligible  net  magnetization.  When  integrated  into  a  tunnel  junction  device,  they  could  potentially  offer  electric  current-driven  switching  and  oscillation  dynamics  in  the  terahertz  (THz)  regime.  Hafnia-based  FE  materials  form  yet  another  category  of  CMOS-compatible  materials  that  could  exhibit  switching  dynamics  in  the  hundreds  of  MHz  frequency  regime  when  driven  by  electric  voltage.  These  materials  can  be  utilized  in  ferroelectric  tunnel  junctions  (FTJs)  or  in  the  gate  stack  of  ferroelectric  field-effect  transistors  (FEFETs),  enabling  the  operation  of  multi-state  tunable  memory  or  sources  of  random  numbers.                        The  research  presented  encompasses  three  main  themes:  numerical  modeling  frameworks  to  investigate  material  dynamics,  exploration  of  various  dynamics  and  their  dependence  on  material  parameters  and  external  stimuli,  and  leveraging  these  dynamics  for  developing  CMOS-compatible  and  energy-efficient  devices  and  circuits.  In  this  context,  FM  and  AFM  dynamics  are  modeled  using  the  Landau-Lifshitz  Gilbert  (LLG)  equation  to  study  current-driven  switching  and  oscillation  dynamics.  Analytic  models,  in  agreement  with  numerical  results,  are  developed  as  a  function  of  material  parameters  and  external  stimuli.  On  the  device  front,  applications  such  as  true  random  number  generators  and  spiking  neuron  emulators  are  explored  for  FMs  and  AFMs,  respectively.  Additionally,  the  nucleation-limited  switching  (NLS)  model  is  employed  to  investigate  field-driven  dynamics  in  FE  materials  and  devices.  Finally,  a  FE  oscillator-based  room  temperature  Ising  machine  circuit  for  solving  combinatorial  optimization  problems  is  proposed.
■590    ▼aSchool  code:  0090.
■650  4▼aCondensed  matter  physics
■650  4▼aMaterials  science
■650  4▼aElectrical  engineering
■650  4▼aElectromagnetics
■653    ▼aSpintronics
■653    ▼aMagnetism
■653    ▼aFerroelectricity
■653    ▼aFerroelectric  materials
■653    ▼aFerromagnets
■653    ▼aAntiferromagnets
■653    ▼aModeling  dynamics
■690    ▼a0544
■690    ▼a0611
■690    ▼a0794
■690    ▼a0607
■71020▼aUniversity  of  Illinois  at  Urbana-Champaign▼bElectrical  &  Computer  Eng.
■7730  ▼tDissertations  Abstracts  International▼g87-05B.
■790    ▼a0090
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361092▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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