Nonlocal ultrafast demagnetization dynamics of Co/Pt multilayers by optical field enhancement

Schmising, C. vonKorff; Giovannella, Martina; Weder, David; Schaffert, S.; Webb, James L.; Eisebitt, Stefan

doi:10.1088/1367-2630/17/3/033047

Cited by 26 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The antisymmetric component A(τ ) (figure 4(a)) timedependence corresponds to type I UDM [1], with demagnetization time smaller than equilibration time τ M < τ E , similar to Co and Co/Pt [6], and consistent with measurements of UDM in Co/Pd with XMCD [24], XRMS [25], X-ray Fourier transform holography [26], and optical Kerr Effect [16]. A rate equation double-exponential fit was applied to quantify the overall variations with fluence…”

Section: Resultssupporting

confidence: 76%

Ultrafast demagnetization at high temperatures

Hoveyda

Hohenstein

Judge

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Time-resolved pump-probe measurements were made at variable heat accumulation in Co/Pd superlattices. Heat accumulation increases the baseline temperature and decreases the equilibrium magnetization. Transient ultrafast demagnetization first develops with higher fluence in parallel with strong equilibrium thermal spin fluctuations. The ultrafast demagnetization is then gradually removed as the equilibrium temperature approaches the Curie temperature. The transient magnetization time-dependence is well fit with the spin-flip scattering model.

show abstract

Section: Resultssupporting

confidence: 76%

Ultrafast demagnetization at high temperatures

Hoveyda

Hohenstein

Judge

et al. 2018

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…[ 20 ] The fast remagnetization process also can be controlled by varying the parameters such as electron–phonon coupling strength, specific heat, magnetocrystalline anisotropy, heat diffusion process, and the density of laser excitation. [ 20–23 ]…”

Section: Introductionmentioning

confidence: 99%

“…[20] The fast remagnetization process also can be controlled by varying the parameters such as electron-phonon coupling strength, specific heat, magnetocrystalline anisotropy, heat diffusion process, and the density of laser excitation. [20][21][22][23] The Gilbert damping constant 𝛼 is another important parameter of FM materials that also controls the performance of many spintronic and magnonic devices. Therefore, controlling 𝛼 is of paramount importance for optimizing the performance of such devices.…”

Section: Introductionmentioning

confidence: 99%

Role of Spin–Orbit Coupling on Ultrafast Spin Dynamics in Nonmagnet/Ferromagnet Heterostructures

et al. 2022

View full text Add to dashboard Cite

Spin-orbit coupling (SOC), the interaction between spin and orbital angular momentum of electrons, is imperative to control magnetic properties of nonmagnet (NM)/ferromagnet (FM) heterostructures and design energy-efficient and faster spin-based devices. Here, femtosecond pulsed laser-induced time-resolved magneto-optical Kerr effect magnetometry is employed to investigate magnetization dynamics in different NM/Co 20 Fe 60 B 20 heterostructures, where the NM layer varies as Cu, Ta, W, Pt, Ta/Ru/Ta, and Si/SiO 2 (no underlayer) that differ in SOC strength. It is observed that there is a systematic variation in ultrafast demagnetization time (𝝉 m ), fast remagnetization time (𝝉 r ), and Gilbert damping parameter (𝜶) with the SOC strength of the underlayer and an inverse relationship between 𝜶 and 𝝉 m , 𝝉 r is established due to the dominant contribution of spin current transport in ultrafast demagnetization and fast remagnetization processes. The spin pumping formalism estimates the effective spin-mixing conductance (G eff ) for different interfaces, which signifies that the high SOC strength of underlayers results in high G eff indicating more efficient transport of spin current through it. This study suggests that the SOC strength of the NM underlayer plays a significant role in controlling the ultrafast demagnetization process through interfacial spin current transport in a NM/FM heterostructure which can be beneficial for the development of ultrafast spintronics devices.

show abstract

“…(a) Left panel: Te, T latt , M of a ultrafast model for P abs = 40 mW and h = 4.1 nm with bulk cobalt parameters[3,5,16], neglecting heat accumulation and electron-induced UDM. Right panel: sketch of magnetization time-dependence in GdFeCo with AOS domains starting after ∼ 10 ps at the center[31].…”

mentioning

confidence: 99%