Study of A Phenomenon STT (Spin Transfer Torque) on the Material La0.7Sr0.3MnO3 Shaped Nanowire Using Micromagnetic Simulation

STT (Spin Transfer Torque) can be referred to as a process of manipulation and control of spin current in the field of spintronics. When the material is ferromagnetic nanowire La0.7Sr0.3MnO3injected currents will move the domain wall with accompanying changes of spin currents. In mikromagnetik simulation shows that the application is capable of producing flow velocity or pressure of domain wall in the direction of electron flow. The domain wall pressure generating magnetization changes with increasing current density occurs. To that end, the simulation research was done in order to obtain the effect of the injection of electric current to the magnetization of the material. This phenomenon is simulated by modeling the material into the 3D geometry. The greater the current density is given the domain wall velocity or pressure on the nanowire faster so that the magnetization process is also faster. Changes in the velocity of the fastest domain wall is obtained when the material is injected with a current density as well as M-t get a graph showing oscillation pattern that is denser when the current is increased. Furthermore, the total energy analysis with variations in size diameter of 10 nm, 20 nm and 30 nm. The results show that with increasing diameter, total energy tends to increase. Keywords: spin transfer torque, La0.7Sr0.3MnO3, magnetisation, domain wall, ferromagnetic

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Analytical study of spin current density and spin-transfer torque in semi-Dirac heterostructures

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2021.168117 ◽

2021 ◽

pp. 168117

Author(s):

Abbas Zarifi ◽

Moslem Zare

Keyword(s):

Current Density ◽

Analytical Study ◽

Spin Current ◽

Spin Transfer Torque ◽

Spin Transfer

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Domain-wall pinning, nonadiabatic spin-transfer torque, and spin-current polarization in permalloy wires doped with vanadium

Physical Review B ◽

10.1103/physrevb.81.020413 ◽

2010 ◽

Vol 81 (2) ◽

Cited By ~ 35

Author(s):

S. Lepadatu ◽

J. S. Claydon ◽

C. J. Kinane ◽

T. R. Charlton ◽

S. Langridge ◽

...

Keyword(s):

Domain Wall ◽

Spin Current ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Domain Wall Pinning

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Dynamics of chiral solitons driven by polarized currents in monoaxial helimagnets

Scientific Reports ◽

10.1038/s41598-020-76903-8 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Victor Laliena ◽

Sebastian Bustingorry ◽

Javier Campo

Keyword(s):

Current Density ◽

Steady Motion ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Applied Current ◽

Applied Current Density ◽

Magnetic Structures ◽

And Control ◽

Moriya Interaction ◽

Chiral Solitons

AbstractChiral solitons are one dimensional localized magnetic structures that are metastable in some ferromagnetic systems with Dzyaloshinskii–Moriya interactions and/or uniaxial magnetic anisotropy. Though topological textures in general provide a very interesting playground for new spintronics phenomena, how to properly create and control single chiral solitons is still unclear. We show here that chiral solitons in monoaxial helimagnets, characterized by a uniaxial Dzyaloshinskii–Moriya interaction, can be stabilized with external magnetic fields. Once created, the soliton moves steadily in response to a polarized electric current, provided the induced spin-transfer torque has a dissipative (nonadiabatic) component. The structure of the soliton depends on the applied current density in such a way that steady motion exists only if the applied current density is lower than a critical value, beyond which the soliton is no longer stable.

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Critical current density of domain wall oscillation due to spin-transfer torque

Journal of Physics Conference Series ◽

10.1088/1742-6596/292/1/012007 ◽

2011 ◽

Vol 292 ◽

pp. 012007 ◽

Cited By ~ 1

Author(s):

T Taniguchi ◽

H Imamura

Keyword(s):

Domain Wall ◽

Critical Current Density ◽

Critical Current ◽

Current Density ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Wall Oscillation

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Investigation on the Effect of Femtosecond Laser Induced Spin Transfer Torque of GdFeCo Alloy

Applied Sciences ◽

10.3390/app11146501 ◽

2021 ◽

Vol 11 (14) ◽

pp. 6501

Author(s):

Haozhe Huang ◽

Haiwei Wang ◽

Zhihao Zeng ◽

Rongyao Wang ◽

Xinyu Zhang ◽

...

Keyword(s):

Data Storage ◽

Current Density ◽

Magnetization Reversal ◽

Spin Current ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Magnetic Data ◽

Magnetization Switching ◽

Switching Speed ◽

Novel Approach

All-optical magnetic switching (AOS) provides a novel approach to improve writing ability and energy efficiency compared to those utilized in the mainstream magnetic data storage products. Rare earth-transition metals (RE-TM) exhibit extremely fast magnetization switching induced by one single incident linearly polarized laser pulse; however, the mechanism is still ambiguous. Here, we show by atomistic spin simulation that the laser induced spin transfer torque dominates the magnetization reversal of Fe sublattice in Gd25Fe75 alloy, and that the switching speed of Gd25Fe75 alloy is relevant to the amount of spin current. This implies that a possible helicity independent mechanism underlies the RE-TM alloy AOS process. We also find that the greater the spin current density the faster the magnetization switching, and the time magnetization reversal of Gd and Fe takes is also affected by the spin current density.

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CORIDOR: Using CO herence and Tempo R al Local I ty to Mitigate Read D isurbance Err OR in STT-RAM Caches

ACM Transactions on Embedded Computing Systems ◽

10.1145/3484493 ◽

2022 ◽

Vol 21 (1) ◽

pp. 1-24

Author(s):

Sheel Sindhu Manohar ◽

Sparsh Mittal ◽

Hemangee K. Kapoor

Keyword(s):

Total Energy ◽

Energy Saving ◽

Energy Savings ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Read Operation ◽

Near Future ◽

The Ideal

In the deep sub-micron region, “spin-transfer torque RAM” (STT-RAM ) suffers from “read-disturbance error” (RDE) , whereby a read operation disturbs the stored data. Mitigation of RDE requires restore operations, which imposes latency and energy penalties. Hence, RDE presents a crucial threat to the scaling of STT-RAM. In this paper, we offer three techniques to reduce the restore overhead. First, we avoid the restore operations for those reads, where the block will get updated at a higher level cache in the near future. Second, we identify read-intensive blocks using a lightweight mechanism and then migrate these blocks to a small SRAM buffer. On a future read to these blocks, the restore operation is avoided. Third, for data blocks having zero value, a write operation is avoided, and only a flag is set. Based on this flag, both read and restore operations to this block are avoided. We combine these three techniques to design our final policy, named CORIDOR. Compared to a baseline policy, which performs restore operation after each read, CORIDOR achieves a 31.6% reduction in total energy and brings the relative CPI (cycle-per-instruction) to 0.64×. By contrast, an ideal RDE-free STT-RAM saves 42.7% energy and brings the relative CPI to 0.62×. Thus, our CORIDOR policy achieves nearly the same performance as an ideal RDE-free STT-RAM cache. Also, it reaches three-fourths of the energy-saving achieved by the ideal RDE-free cache. We also compare CORIDOR with four previous techniques and show that CORIDOR provides higher restore energy savings than these techniques.

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