Far- and midinfrared excitation of large amplitude spin precession in the ferromagnetic semiconductor InMnAs

Gatilova, A.; Mashkovich, E. A.; Grishunin, K. A.; Pogrebna, A.; Mikhaylovskiy, R. V.; Rasing, Th.; Christianen, P. M.; Nishizawa, Nozomi; Munekata, H.; Kimel, A. V.

doi:10.1103/physrevb.101.020413

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…This trend is consistent with the data reported in Ref. 11, where for the pump at the wavelength of 2500 nm (photon energy: 0.5 eV), no saturation was observed for pump fluences up to 30 mJ/cm 2 .…”

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confidence: 93%

“…[4][5][6][7][8] It was discovered that femtosecond excitation of free carriers, i.e., intraband electronic transitions, in magnetic metals is able to launch ultrafast demagnetization on a subpicosecond timescale 9 and even to reverse magnetization without any magnetic fields. 10 In our recent paper, 11 we have studied spin dynamics induced in ferromagnetic semiconductor InMnAs by terahertz (THz) and infrared (IR) pulses, which triggered intraband and interband electronic transitions, respectively. The experiments revealed that THz and IR pump pulses induce ultrafast demagnetization at nearly similar timescales, but THz pulse does it 100 times more energy efficiently than the IR counterpart.…”

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confidence: 99%

“…It is known that both IR and THz pulses efficiently launch spin dynamics in the very same InMnAs sample. 11 The dynamics starts with a fast demagnetization. Tuning the orientation and the strength of the applied magnetic field, it is possible to achieve that the demagnetization is followed by a precession of the net magnetization at the frequency of the ferromagnetic resonance.…”

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confidence: 99%

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Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Mashkovich¹,

Grishunin

Munekata

et al. 2020

Applied Physics Letters

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Subpicosecond pumping of ferromagnetic semiconductor InMnAs in the ranges of intra- and interband electronic transitions can result in an efficient demagnetization of the medium up to 60% of the initial magnetic moment. Here, we report about the efficiency of ultrafast demagnetization by a duo of terahertz and infrared pulses that trigger intra- and interband electronic transitions, respectively. Varying the intensities of the pulses and the delay between them, we study the degree of demagnetization caused by the pulse duo. It is shown that the result of the excitation does not depend on the pulse sequence. Our findings indicate that both intra- and interband electronic transitions result in ultrafast demagnetization of the semiconductor via the very same mechanism, which evolves at a ps timescale. Independent of the origin of the electronic transition, ultrafast demagnetization is a result of a temperature increase in the free charge carriers (holes).

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confidence: 93%

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confidence: 99%

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confidence: 99%

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Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Mashkovich¹,

Grishunin

Munekata

et al. 2020

Applied Physics Letters

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“…An external magnetic field H ≈ 1.5 kOe along the sample normal was applied to force the magnetization to get aligned out of plane. Detailed descriptions of the THz setup have been reported elsewhere [29,30].…”

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confidence: 99%

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Zhang

Blank²,

Guillemard

et al. 2023

Phys. Rev. B

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We investigate the ultrafast demagnetization in Co 2 MnSi 1-x Al x quaternary Heusler compounds induced by terahertz (THz) and infrared (IR) pulses. Adjusting the alloy's composition allows us to tailor the spin polarization at the Fermi energy from 97% ± 3% (Co 2 MnSi) due to its minority spin gap around 0.6 eV, down to 63% ± 3% (Co 2 MnAl) without a spin gap. Here we experimentally compare the cases of ultrafast demagnetization, when the material is excited with the help of laser pulses with photon energies below and above the minority spin gap, respectively. More particularly, the pump-photon energies were tuned from 1.02 eV (IR) down to 4.1 meV (THz). We found that the ultrafast demagnetization time decreases upon substitution of Si by Al and thus destroys the minority spin gap. Moreover, a decrease of the pump-photon energies in the near-infrared spectral range results in a slight increase of the demagnetization time. Nevertheless, further decrease of the photon energy by a factor of 250 hardly changes the characteristic time of ultrafast demagnetization. Both THz and IR pulses cause very similar ultrafast magnetization dynamics in our Co 2 MnSi 1-x Al x Heusler compounds.

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Engineering Co₂MnAl_xSi₁₋_x Heusler Compounds as a Model System to Correlate Spin Polarization, Intrinsic Gilbert Damping, and Ultrafast Demagnetization

et al. 2020

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Engineering of magnetic materials for developing better spintronic applications relies on the control of two key parameters: the spin polarization and the Gilbert damping, responsible for the spin angular momentum dissipation. Both of them are expected to affect the ultrafast magnetization dynamics occurring on the femtosecond timescale. Here, engineered Co2MnAlxSi1‐x Heusler compounds are used to adjust the degree of spin polarization at the Fermi energy, P, from 60% to 100% and to investigate how they correlate with the damping. It is experimentally demonstrated that the damping decreases when increasing the spin polarization from 1.1 × 10−3 for Co2MnAl with 63% spin polarization to an ultralow value of 4.6 × 10−4 for the half‐metallic ferromagnet Co2MnSi. This allows the investigation of the relation between these two parameters and the ultrafast demagnetization time characterizing the loss of magnetization occurring after femtosecond laser pulse excitation. The demagnetization time is observed to be inversely proportional to 1 – P and, as a consequence, to the magnetic damping, which can be attributed to the similarity of the spin angular momentum dissipation processes responsible for these two effects. Altogether, the high‐quality Heusler compounds allow control over the band structure and therefore the channel for spin angular momentum dissipation.

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Far- and midinfrared excitation of large amplitude spin precession in the ferromagnetic semiconductor InMnAs

Cited by 4 publications

References 30 publications

Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Engineering Co₂MnAl_xSi₁₋_x Heusler Compounds as a Model System to Correlate Spin Polarization, Intrinsic Gilbert Damping, and Ultrafast Demagnetization

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Far- and midinfrared excitation of large amplitude spin precession in the ferromagnetic semiconductor InMnAs

Cited by 4 publications

References 30 publications

Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Ultrafast demagnetization of ferromagnetic semiconductor InMnAs by dual terahertz and infrared excitations

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Engineering Co2MnAlxSi1−x Heusler Compounds as a Model System to Correlate Spin Polarization, Intrinsic Gilbert Damping, and Ultrafast Demagnetization

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Engineering Co₂MnAl_xSi₁₋_x Heusler Compounds as a Model System to Correlate Spin Polarization, Intrinsic Gilbert Damping, and Ultrafast Demagnetization