Systematic study of the spin stiffness dependence on phosphorus alloying in the ferromagnetic semiconductor (Ga,Mn)As

Shihab, Sylvain; Riahi, Hassen; Thevenard, L.; Bardeleben, HJ von; Lemaı̂tre, A.; Gourdon, C.

doi:10.1063/1.4917423

Cited by 16 publications

(19 citation statements)

References 26 publications

(42 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corresponding values of the Curie temperature, calcu-lated in the real-space RPA 9 , are: T C = (124 ± 1) K for y = 0 and T C = (122±1) K for y = 0.1 (irrespective of a). The calculated results agree thus with the observed negligible sensitivity of D to alloying by phosphorus 14 ; the origin of the reduction of D, reported in Ref. 18, might be ascribed to additional compensating defects induced by P doping which should also reduce the T C .…”

Section: B Bulk (Gamn)as and (Gamn)(asp)supporting

confidence: 88%

Coherence and stiffness of spin waves in diluted ferromagnets

2016

View full text Add to dashboard Cite

We present results of a numerical analysis of magnon spectra in supercells simulating two-dimensional and bulk random diluted ferromagnets with long-ranged pair exchange interactions. We show that low-energy spectral regions for these strongly disordered systems contain a coherent component leading to interference phenomena manifested by a pronounced sensitivity of the lowest excitation energies to the adopted boundary conditions. The dependence of configuration averages of these excitation energies on the supercell size can be used for an efficient determination of the spin-wave stiffness D. The developed formalism is applied to the ferromagnetic Mn-doped GaAs semiconductor with optional incorporation of phosphorus; the obtained concentration trends of D are found in reasonable agreement with recent experiments. Moreover, a relation of the spin stiffness to the Curie temperature Tc has been studied for Mn-doped GaAs and GaN semiconductors. It is found that the ratio Tc/D exhibits qualitatively the same dependence on Mn concentration in both systems.Comment: 7 pages, 7 figures, accepted in Phys. Rev.

show abstract

Section: B Bulk (Gamn)as and (Gamn)(asp)supporting

confidence: 88%

Coherence and stiffness of spin waves in diluted ferromagnets

2016

View full text Add to dashboard Cite

show abstract

“…Periodic boundary conditions are applied in the direction perpendicular to k saw . The following magnetic parameters were used: M s = 50 kA.m −1 , Gilbert damping α=0.1, K 2⊥ = -8133 J.m −3 ,K 2|| =800 J.m −3 , exchange constant [50] A ex = 10 −13 J.m −1 , cubic anisotropy K c =300 J.m −3 . Mu-Max on our OS does not accomodate two uniaxial anisotropies, so only the in-plane uniaxial anisotropy was considered.…”

Section: B Micromagnetic Simulations Parametersmentioning

confidence: 99%

Resonant magneto-acoustic switching: influence of Rayleigh wave frequency and wavevector

Kuszewski

Camara

Biarrotte

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We show on in-plane magnetized thin films that magnetization can be switched efficiently by 180 degrees using large amplitude Rayleigh waves travelling along the hard or easy magnetic axis. Large characteristic filament-like domains are formed in the latter case. Micromagnetic simulations clearly confirm that this multi-domain configuration is compatible with a resonant precessional mechanism. The reversed domains are in both geometries several hundreds of [Formula: see text], much larger than has been shown using spin transfer torque- or field-driven precessional switching. We show that surface acoustic waves can travel at least 1 mm before addressing a given area, and can interfere to create magnetic stripes that can be positioned with a sub-micronic precision.

show abstract

“…With the field along the easy axis, magnetization reversal proceeds by the nucleation and propagation of domain walls (DWs). With A ex the exchange constant [25] and K u the out-ofplane uniaxial anisotropy [measured by cavity ferromagnetic resonance (FMR)], their energy is given by σ = 4 √ A ex K u , and their velocity in the stationary regime [26] by v stat ∝ , with = √ A ex /K u . Both σ and v stat depend on K u , the dominant magnetoelastic term in (Ga,Mn)(As,P).…”

Section: Fig 5 Kerr Microscopy Images (690 × 924 μMmentioning

confidence: 99%

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

et al. 2016

Self Cite

View full text Add to dashboard Cite

Systematic study of the spin stiffness dependence on phosphorus alloying in the ferromagnetic semiconductor (Ga,Mn)As

Abstract: Spin-dependent tunneling and properties of ferromagnetic (Ga,Mn)As (invited)

Cited by 16 publications

References 26 publications

Coherence and stiffness of spin waves in diluted ferromagnets

Coherence and stiffness of spin waves in diluted ferromagnets

Resonant magneto-acoustic switching: influence of Rayleigh wave frequency and wavevector

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

Contact Info

Product

Resources

About