Efficient Chiral-Domain-Wall Motion Driven by Spin-Orbit Torque in Metastable Platinum Films

2020 ◽  
Vol 14 (3) ◽  
Author(s):  
Chirag Garg ◽  
See-Hun Yang ◽  
Leslie Thompson ◽  
Teya Topuria ◽  
Amir Capua ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Spin Orbit

scholarly journals Voltage Controlled Domain Wall Motion based Neuron and Stochastic Magnetic Tunnel Junction Synapse for Neuromorphic Computing Applications

2021 ◽  
Author(s):  
Aijaz Lone ◽  
Selma Amara ◽  
Hossein Fariborzi
Keyword(s):  
Domain Wall ◽  
Tunnel Junction ◽  
Thermal Noise ◽  
Wall Motion ◽  
Magnetic Tunnel Junction ◽  
Domain Wall Motion ◽  
Spin Orbit ◽  
Free Layer ◽  
Digit Recognition ◽  
Transport Studies

The present work discusses the proposal of a spintronic neuromorphic system with spin orbit torque driven domain wall motion-based neuron and synapse. We propose a voltage-controlled magnetic anisotropy domain wall motion based magnetic tunnel junction neuron. We investigate how the electric field at the gate (pinning site), generated by the voltage signals from pre-neurons, modulates the domain wall motion, which reflects in the non-linear switching behaviour of neuron magnetization. For the implementation of synaptic weights, we propose 3-terminal MTJ with stochastic domain wall motion in the free layer. We incorporate intrinsic pinning effects by creating triangular notches on the sides of the free layer. The pinning of domain wall and intrinsic thermal noise of device lead to the stochastic behaviour of domain wall motion. The control of this stochasticity by the spin orbit torque is shown to realize the potentiation and depression of the synaptic weight. The micromagnetics and spin transport studies in synapse and neuron are carried out by developing a coupled micromagnetic Non-Equilibrium Green’s Function (<i>MuMag-NEGF</i>) model. The minimization of the writing current pulse width by leveraging the thermal noise and demagnetization energy is also presented. Finally, we discuss the implementation of digit recognition by the proposed system using a spike time dependent algorithm.

Domain-wall motion at an ultrahigh speed driven by spin–orbit torque in synthetic antiferromagnets

2018 ◽  
Vol 29 (17) ◽  
pp. 175404 ◽  
Author(s):  
Ziyang Yu ◽  
Yue Zhang ◽  
Zhenhua Zhang ◽  
Ming Cheng ◽  
Zhihong Lu ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Spin Orbit

scholarly journals Antiferromagnetic Domain Wall Motion Driven by Spin-orbit Torques

2016 ◽  
Author(s):  
K.J. Lee ◽  
T. Shiino ◽  
S.H. Oh ◽  
P.M. Haney ◽  
S.W. Lee ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Spin Orbit

scholarly journals Antiferromagnetic Domain Wall Motion Driven by Spin-Orbit Torques

2016 ◽  
Vol 117 (8) ◽  
Author(s):  
Takayuki Shiino ◽  
Se-Hyeok Oh ◽  
Paul M. Haney ◽  
Seo-Won Lee ◽  
Gyungchoon Go ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Spin Orbit
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