Modelling current-induced magnetization switching in Heusler alloy Co2FeAl-based spin-valve nanopillar

Huang, Houbing; Q., X.; Liu, Z. H.; Zhao, Chongjun; Chen, Lei

doi:10.1063/1.4870291

Cited by 9 publications

(4 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamics of magnetization was investigated by numerically solving the time-dependent LLGS equation using the Gauss-Seidel projection method and the semi-implicit Fourier spectral method. 44,45 The samples were discretized in computational cells of 2 Â 2 Â 2 nm 3 , and the total size is 80 Â 80 Â 20 nm 3 . 46 Figure 2…”

mentioning

confidence: 99%

Strain-assisted current-induced magnetization reversal in magnetic tunnel junctions: A micromagnetic study with phase-field microelasticity

Huang

Yang

et al. 2014

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

Effect of substrate misfit strain on current-induced in-plane magnetization reversal in CoFeB-MgO based magnetic tunnel junctions is investigated by combining micromagnetic simulations with phase-field microelasticity theory. It is found that the critical current density for in-plane magnetization reversal decreases dramatically with an increasing substrate strain, since the effective elastic field can drag the magnetization to one of the four in-plane diagonal directions. A potential strainassisted multilevel bit spin transfer magnetization switching device using substrate misfit strain is also proposed. V

show abstract

mentioning

confidence: 99%

Strain-assisted current-induced magnetization reversal in magnetic tunnel junctions: A micromagnetic study with phase-field microelasticity

Huang

Yang

et al. 2014

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…The dynamics of magnetization is investigated by numerically solving the timedependent LLGS equation using the Gauss-Seidel projection method with a constant time step ∆t= 0.0268858 ps. [36][37][38] We adopted the following magnetic parameters, magnetocrystalline anisotropy constant K 1 =3.0×10 3 J/m 3 , and K 2 =0, 39 exchange constant A=2.0×10 -11 J/m, 40 saturation magnetization M s =8.0×10 5 A/m. 41 Other parameters are Gilbert damping parameter α=0.008, 14 spin polarization factor η=0.56, 42,43 electron gyromagnetic ratio γ=2.3245×10 5 For clarify, the PSD of y axis shifts up with 0.5 each curve with the increase of external stress.…”

Section: Methodsmentioning

confidence: 99%

Simulation of stress-modulated magnetization precession frequency in Heusler-based spin torque oscillator

Huang

Zhao

2017

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

We investigated stress-modulated magnetization precession frequency in Heuslerbased spin transfer torque oscillator by combining micromagnetic simulations with phase field microelasticity theory, by encapsulating the magnetic tunnel junction into multilayers structures. We proposed a novel method of using an external stress to control the magnetization precession in spin torque oscillator instead of an external magnetic field. The stress-modulated magnetization precession frequency can be linearly modulated by externally applied uniaxial in-plane stress, with a tunable range 4.4~7.0 GHz under the stress of 10MPa. By comparison, the out-ofplane stress imposes negligible influence on the precession frequency due to the large out-of-plane demagnetization field. The results offer new inspiration to the design of spin torque oscillator devices that simultaneously process high frequency, narrow output band, and tunable over a wide range of frequencies via external stress.

show abstract

“…Moreover, they generally display a perpendicular anisotropy which has been experimentally carried out for certain Heusler alloys [15]. Thanks to these characteristics, recent experiences and simulations demonstrated the ability to get the magnetization switching from a low current density of about 10 6 -10 4 A/cm 2 [7,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 94%

Micromagnetic simulation of current-induced magnetization dynamics in a half-Heusler Co1.5Fe1.5Ge alloy spin-valve nanopillar

Belrhazi

Hafidi

2018

SN Appl. Sci.

View full text Add to dashboard Cite

We investigated the magnetization switching by means of a spin-polarized current via spin-transfer torque (STT) in a half-metallic Heusler Co 1.5 Fe 1.5 Ge alloy by numerically solving the Landau-Lifshitz-Gilbert-Slonczewski equation including the STT term in a spin-valve nanopillar Co 1.5 Fe 1.5 Ge/Ag/Co 1.5 Fe 1.5 Ge using micromagnetic simulation. In this work, we use Co 1.5 Fe 1.5 Ge film of 2 nm thickness, and then we inject a spin polarization current perpendicular to plane of the multilayers in order to flip the free layer magnetization and therefore get the magnetization switching between the two layers. Half-metallic Heusler Co 1.5 Fe 1.5 Ge is characterized by a small Gilbert damping constant α = 0.0025 and a complete spin polarization at the Fermi level. Using these specific parameters, we obtain the magnetization switching between the free layer and the pinned layer with a critical current density of about 10 6 A/cm 2 , as well the magnetization switching process of nanopillar are discussed and analyzed. Also, we deeply examine the behavior of magnetization switching dynamic as a function of the current density within a weak external magnetic field which helps to trig switching. Finally, we studied the impact of free layer thickness on magnetization switching dynamic and STT energy in order to immunize further the switching time and the critical current density.

show abstract

Modelling current-induced magnetization switching in Heusler alloy Co2FeAl-based spin-valve nanopillar

Cited by 9 publications

References 35 publications

Strain-assisted current-induced magnetization reversal in magnetic tunnel junctions: A micromagnetic study with phase-field microelasticity

Strain-assisted current-induced magnetization reversal in magnetic tunnel junctions: A micromagnetic study with phase-field microelasticity

Simulation of stress-modulated magnetization precession frequency in Heusler-based spin torque oscillator

Micromagnetic simulation of current-induced magnetization dynamics in a half-Heusler Co1.5Fe1.5Ge alloy spin-valve nanopillar

Contact Info

Product

Resources

About