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Title: Macrospin modeling of sub-ns pulse switching of perpendicularly magnetized free layer via spin-orbit torques for cryogenic memory applications

We model, using the macrospin approximation, the magnetic reversal of a perpendicularly magnetized nanostructured free layer formed on a normal, heavy-metal nanostrip, subjected to spin-orbit torques (SOTs) generated by short (≤0.5 ns) current pulses applied to the nanostrip, to examine the potential for SOT-based fast, efficient cryogenic memory. Due to thermal fluctuations, if solely an anti-damping torque is applied, then, for a device with sufficiently low anisotropy (H{sub anis}{sup 0} ∼ 1 kOe) suitable for application in cryogenic memory, a high magnetic damping parameter (α∼0.1−0.2) is required for reliable switching over a significant variation of pulse current. The additional presence of a substantial field-like torque improves switching reliability even for low damping (α≤0.03).
Authors:
; ; ;  [1] ;  [1] ;  [2]
  1. Cornell University, Ithaca, New York 14853 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22310832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; APPROXIMATIONS; CURRENTS; DAMPING; FLUCTUATIONS; HEAVY METALS; NANOSTRUCTURES; ORBITS; PULSES; RELIABILITY; SIMULATION; SPIN; TORQUE