scholarly journals Effect of electrical current pulses on domain walls in Pt/Co/Pt nanotracks with out-of-plane anisotropy: Spin transfer torque versus Joule heating

2010 ◽  
Vol 81 (2) ◽  
Author(s):  
M. Cormier ◽  
A. Mougin ◽  
J. Ferré ◽  
A. Thiaville ◽  
N. Charpentier ◽  
...  
Keyword(s):  
Joule Heating ◽  
Domain Walls ◽  
Electrical Current ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Current Pulses ◽  
Plane Anisotropy ◽  
Out Of Plane

Materials, Devices and Spin Transfer Torque in Antiferromagnetic Spintronics: A Concise Review

SPIN ◽  
2017 ◽  
Vol 07 (03) ◽  
pp. 1740014 ◽  
Author(s):  
Cormac Ó Coileáin ◽  
Han Chun Wu
Keyword(s):  
Magnetic Fields ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Tetragonal Structure ◽  
Next Generation ◽  
Tunnel Magnetoresistance ◽  
Spintronic Devices ◽  
Concise Review ◽  
Plane Anisotropy ◽  
Magnetic States

From historical obscurity, antiferromagnets are recently enjoying revived interest, as antiferromagnetic (AFM) materials may allow the continued reduction in size of spintronic devices. They have the benefit of being insensitive to parasitic external magnetic fields, while displaying high read/write speeds, and thus poised to become an integral part of the next generation of logical devices and memory. They are currently employed to preserve the magnetoresistive qualities of some ferromagnetic based giant or tunnel magnetoresistance systems. However, the question remains how the magnetic states of an antiferromagnet can be efficiently manipulated and detected. Here, we reflect on AFM materials for their use in spintronics, in particular, newly recognized antiferromagnet Mn2Au with its in-plane anisotropy and tetragonal structure and high Néel temperature. These attributes make it one of the most promising candidates for AFM spintronics thus far with the possibility of architectures freed from the need for ferromagnetic (FM) elements. Here, we discuss its potential for use in ferromagnet-free spintronic devices.

scholarly journals The increase of the spin-transfer torque threshold current density in coupled vortex domain walls

2011 ◽  
Vol 24 (2) ◽  
pp. 024210 ◽  
Author(s):  
S Lepadatu ◽  
A P Mihai ◽  
J S Claydon ◽  
F Maccherozzi ◽  
S S Dhesi ◽  
...  
Keyword(s):  
Current Density ◽  
Domain Walls ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Spin Transfer Torque ◽  
Spin Transfer

Impact of Device Variability and Circuit Phase Shift in Synchronized Spin Torque Oscillators

2007 ◽  
Vol 998 ◽  
Author(s):  
Johan Persson ◽  
Yan Zhou ◽  
Johan Akerman
Keyword(s):  
Phase Diagram ◽  
Time Delay ◽  
Process Variations ◽  
Small Time ◽  
Spin Transfer Torque ◽  
Spin Torque ◽  
Plane Anisotropy ◽  
Out Of Plane ◽  
The Impact ◽  
Spin Torque Oscillators

ABSTRACTCurrent-induced magnetization dynamics in a system composed of two electrically coupled spin torque oscillators (STOs) is examined. The dynamics of the STOs is modeled by the Landau–Lifshitz–Gilbert equations modified with a Slonczewski spin-transfer torque term. To study the impact of realistic process variations on STO synchronization we let the two STOs have different in-plane anisotropy fields (Hk). The simulation also provides for a time delay τ. We construct a phase diagram of the STO synchronization as a function of Hk and direct current (Idc) at different τ. The phase diagram turns out to be quite rich with different types of synchronized precession modes. While the synchronized state is originally very sensitive to STO process variations and can only sustain up to 4% Hk variation, the addition of a small time delay dramatically improves its robustness and allows as much as 145% Hk variation in the entire out-of-plane precession regime. It is also shown that the two STOs can not only be locked in frequency, but also in phase at a given τ and the phase difference between the two STOs can be tuned by varying the dc current.

scholarly journals Enhanced spin transfer torque effect for transverse domain walls in cylindrical nanowires

2011 ◽  
Vol 84 (9) ◽  
Author(s):  
Matteo Franchin ◽  
Andreas Knittel ◽  
Maximilian Albert ◽  
Dmitri S. Chernyshenko ◽  
Thomas Fischbacher ◽  
...  
Keyword(s):  
Domain Walls ◽  
Spin Transfer Torque ◽  
Spin Transfer

Controllable Domain Walls in Two-Dimensional Ferromagnetic Material Fe3GeTe2 Based on the Spin-Transfer Torque Effect

ACS Nano ◽  
2021 ◽  
Author(s):  
Ke Pei ◽  
Shanshan Liu ◽  
Liting Yang ◽  
Enze Zhang ◽  
Ruixuan Zhang ◽  
...  
Keyword(s):  
Domain Walls ◽  
Ferromagnetic Material ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Two Dimensional

Joule Heating and Peltier Effects in Thermoelectric Spin-Transfer Torque Mram Devices Using Finite Element Modeling

2014 ◽  
Vol 931-932 ◽  
pp. 989-993 ◽  
Author(s):  
Supakorn Harnsoongnoen ◽  
N. Phaengpha ◽  
S. Ritjaroenwattu ◽  
U. Charoen-In ◽  
Apirat Siritaratiwat
Keyword(s):  
Heat Flux ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Joule Heating ◽  
Tunnel Junction ◽  
Magnetic Tunnel Junction ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Maximum Temperature ◽  
Element Modeling

This paper reports the Joule heating and Peltier effects in thermoelectric spin-transfer torque MRAMs (TSTT-MRAMs). The simulation was undertaken based on the current-induced magnetization switching at the MgO/CoFe magnetic tunnel junction. Thermal and heat flux distributions of the TSTT-MRAM cells were simulated and analyzed using finite-element modeling. The Joule heating and Peltier effects lead to the increases in the temperature and heat flux distributions at the magnetic tunnel junction (MTJ) as well as the thermoelectric module. The maximum temperature of Peltier effect is higher than Joule heating effect when voltage amplitude below 0.77V. Some practical data for the STT-MRAM were also reported.

Tuning Resonance Frequency of Spin Wave Localized in an Isolated Skyrmion by Magnetoelectric Couplings

SPIN ◽  
2019 ◽  
Vol 09 (03) ◽  
pp. 1950009 ◽  
Author(s):  
Rongzhi Zhao ◽  
Wenchao Chen ◽  
Chenglong Hu ◽  
Luyang Chen ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Resonant Frequency ◽  
Total Energy ◽  
Average Energy ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Integer Multiple ◽  
External Perturbations ◽  
Out Of Plane ◽  
Oscillation Frequencies

Understanding the dynamic behavior of an isolated skyrmion with external perturbations has been obstructed due to the difficulty in experimentally observing such an instantaneous phenomenon within picoseconds. Herein, we theoretically investigated the spin-transfer-torque-induced dynamics of an isolated skyrmion excited by external nanosecond-pulse perturbations. It is found that a redshift of the resonant frequency appears under a pulse polarized current with [Formula: see text][Formula: see text]A/m2 and [Formula: see text][Formula: see text]GHz, while a blueshift is presented under a combined perturbation of the pulse polarized current and an out-of-plane ac magnetic field. The physic origins of the redshift and the blueshift are ascribed to the increased average energy of system from [Formula: see text][Formula: see text]J to [Formula: see text][Formula: see text]J and integer multiple (twofold and fourfold) oscillation frequencies of total energy, respectively. The present study could thus provide an insight to the micromagnetic dynamics of skyrmion under the magnetoelectric couplings.

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