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Initialization-Free and Magnetic Field-Free Spin-Orbit p-Bits with Backhopping-like Magnetization Switching for

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Nano Letters
|August 12, 2024
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Summary
This summary is machine-generated.

Initialization-free nonvolatile spin-orbit torque probabilistic bits (p-bits) enable faster probabilistic computing. These backhopping-SOT p-bits demonstrate tunable switching probabilities and achieve integer factorization efficiently.

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initialization-freemagnetization switchingnonvolatilep-bitsprobabilistic computingspin−orbit torque

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Area of Science:

  • Spintronics
  • Probabilistic Computing
  • Materials Science

Background:

  • Probabilistic bits (p-bits) are key for probabilistic computing, utilizing nondeterministic magnetization switching.
  • Existing spin torque p-bits are either volatile or require initialization, limiting their application.
  • Initialization-free nonvolatile p-bits are crucial for advancing probabilistic computing.

Purpose of the Study:

  • To demonstrate initialization-free, nonvolatile spin-orbit torque (SOT) p-bits.
  • To achieve tunable switching probabilities in SOT p-bits.
  • To explore the application of these p-bits in computational tasks like integer factorization.

Main Methods:

  • Fabrication of moderately thermally stable SOT p-bits using non-consecutively deposited Pt//Pt/Co/Pt stacks.
  • Characterization of backhopping-like (BH) magnetization switching behavior.
  • Demonstration of integer factorization using BH-SOT p-bits in zero magnetic field.

Main Results:

  • Achieved initialization-free, nonvolatile BH-SOT p-bits with current-tunable switching probabilities (0% to 100%).
  • Demonstrated significantly faster integer factorization compared to existing p-bit technologies.
  • Attributed the switching behavior to the interplay of SOT and thermal effects.

Conclusions:

  • The developed BH-SOT p-bits are initialization-free and magnetic field-free.
  • These p-bits offer a new avenue for probabilistic spintronic applications.
  • The technology shows promise for efficient probabilistic computing.