Ultrafast magnetization dynamics in the half-metallic Heusler alloy 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>FeAl</mml:mi></mml:math>

Malik, Rameez Saeed; Delczeg‐Czirjak, Erna K.; Knut, Ronny; Thonig, Danny; Vaskivskyi, Igor; Phuyal, Dibya; Gupta, Rahul; Jana, Somnath; Stefanuik, Robert; Kvashnin, Yaroslav; Husain, Sajid; Kumar, Ankit; Svedlindh, Peter; Söderström, Johan; Eriksson, Olle; Karis, Olof

doi:10.1103/physrevb.104.l100408

Cited by 11 publications

(4 citation statements)

References 67 publications

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“…This suggests that magnon dynamics strongly influence the remagnetization process of NM/FM heterostructures in picosecond timescale. [23,30] This also means that by introducing an NM underlayer with varying SOC strength, we can efficiently tune the 𝜏 r by an order of magnitude, that is, from 0.61 ps to 6.70 ps.…”

Section: Soc-dependent Modulation Of Magnetization Dynamicsmentioning

confidence: 99%

“…Recently, Malik et al have shown that the remagnetization process of a FM material can also be controlled by tuning 𝛼 using external means. [30] They have established an inverse relationship between fast remagnetization time (𝜏 r ) and 𝛼 due to the dominant contribution of magnon dynamics to the remagnetization process. Despite some efforts, [16][17][18]25,29,31,32] a systematic study on various effects of SOC of NM materials on the ultrafast demagnetization and fast remagnetization in NM/FM heterostructures has not been performed so far.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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.

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Section: Soc-dependent Modulation Of Magnetization Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…However, almost Heusler samples investigated by TRMOKE are, in fact, capped with a HM layer, [39][40][41] which is commonly used to protect the Heusler alloys against oxidation. Thus, TRMOKE measurement lacks a convincing demonstration of ultrafast spin and charge transports after fs laser excitation, [42,43] which also cannot be obtained by conventional electric circuits with electrodes. In addition, Heusler alloy behaves differently from the elemental magnets, the majority spin channel in Co 2 FeSi is metallic, while the minority spin channel is semiconducting.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Spectral Signatures of Ultrafast Spin Transports in Ferromagnetic Heusler Alloy

Jin

Guo

Peng

et al. 2023

Advanced Physics Research

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Although the Co‐based Heusler compounds are predicted to be half‐metals, their sub‐picosecond demagnetization dynamics upon laser excitation show a transition‐metal‐like behavior. Any possible role of ultrafast nonlocal spin transport on the ultrafast demagnetization of half‐metallic Heusler compounds has only been inferred indirectly by time‐resolved magneto‐optical Kerr effect. Here, an ultrafast optically driven spin current traveling from Co2FeSi half metal into an adjacent Pt layer by using terahertz (THz) emission time‐domain spectroscopy (TDS) is demonstrated. By varying the magnetic field and excitation symmetry, the sizable THz generation from Co2FeSi/Pt stack arises from optically induced spin transport across the Co2FeSi/Pt interface in conjunction with spin‐to‐charge current conversion, via the inverse spin Hall effect (ISHE). The chemical ordering, interface roughness and magnetization of the samples become vital to engineer the THz emission properties. The amplitude of THz emission is comparable to that of CoFeB/Pt stack, thereby indicating Co2FeSi as an efficient ultrafast light‐driven spin current injector. Finally, by varying the pumping energy, the contributions are distinguished to the ultrafast spin current from thermalization and optical excitation of majority spins in Heusler alloy. This work illustrates THz emission TDS as a powerful tool to investigate the ultrafast spintronic properties of Heusler alloy/normal‐metal bilayers.

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“…[19] As a kind of attractive ferromagnetic electrode materials, the Co-based half-metallic Heusler alloys Co 2 FeAl have great potential in spintronic applications due to their large spin polarization, [20,21] low Gilbert damping constant [22,23] and high Curie temperature. [24] There are burgeoning studies on the optically induced ultrafast spin dynamics in Co 2 FeAl including magnondriven remagnetization, [25] isotropic spin polarization, [26] temperature dependence of the magneto-crystalline anisotropy, [27] and thickness, pump fluence, magnetic field, and temperature dependence of the Gilbert damping constant. [27][28][29][30][31] Meanwhile, recent research demonstrated femtosecond optical control of coercivity [32] and complete reversal of magnetic hysteresis loop [33][34][35] in the III-Mn-V diluted magnetic semiconductor (Ga,Mn)As.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer

Liu

Yuan

Liu

et al. 2023

Adv Elect Materials

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Fast spin manipulation in magnetic heterostructures, where magnetic interactions between different materials often define the functionality of devices, is a key issue in the development of ultrafast spintronics. Although recently developed optical approaches such as ultrafast spin‐transfer and spin–orbit torques open new pathways to fast spin manipulation, these processes do not fully utilize the unique possibilities offered by interfacial magnetic coupling effects in ferromagnetic multilayer systems. Here, ultrafast optically controlled interfacial exchange interactions in the ferromagnetic Co2FeAl/(Ga,Mn)As system at low laser fluence levels are experimentally demonstrated. The excitation efficiency of Co2FeAl with the (Ga,Mn)As layer is 30–40 times higher than the case with the GaAs layer at 5 K due to the modification of exchange coupling interaction via photoexcited charge transfer between the two ferromagnetic layers. In addition, the coherent spin precessions persist to room temperature, excluding the drive of pump‐modulated magnetization in the (Ga,Mn)As layer and indicating a proximity‐effect‐related optical excitation mechanism. The results highlight the importance of interfacial exchange interactions in ferromagnetic heterostructures and how these magnetic coupling effects can be utilized for ultrafast, low‐power spin manipulation.

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Ultrafast magnetization dynamics in the half-metallic Heusler alloy Co2FeAl

Cited by 11 publications

References 67 publications

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

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

Terahertz Spectral Signatures of Ultrafast Spin Transports in Ferromagnetic Heusler Alloy

Ultrafast Control of Interfacial Exchange Coupling in Ferromagnetic Bilayer

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