Fundamentals and perspectives of ultrafast photoferroic recording

Kimel, A. V.; Kalashnikova, A.M.; Pogrebna, A.; Zvezdin, A. K.

doi:10.1016/j.physrep.2020.01.004

Cited by 68 publications

(49 citation statements)

References 213 publications

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“…Generation of terahertz (THz) radiation is of great technological importance for many current and future applications, such as non-destructive diagnostics, ultra-fast computing, wireless communications 1 – 4 , as well as direct control of the materials order parameters 5 .…”

Section: Introductionmentioning

confidence: 99%

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Khusyainov

Ovcharenko

Gaponov

et al. 2021

Sci Rep

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Polarization of electromagnetic waves plays an extremely important role in interaction of radiation with matter. In particular, interaction of polarized waves with ordered matter strongly depends on orientation and symmetry of vibrations of chemical bonds in crystals. In quantum technologies, the polarization of photons is considered as a “degree of freedom”, which is one of the main parameters that ensure efficient quantum computing. However, even for visible light, polarization control is in most cases separated from light emission. In this paper, we report on a new type of polarization control, implemented directly in a spintronic terahertz emitter. The principle of control, realized by a weak magnetic field at room temperature, is based on a spin-reorientation transition (SRT) in an intermetallic heterostructure TbCo2/FeCo with uniaxial in-plane magnetic anisotropy. SRT is implemented under magnetic field of variable strength but of a fixed direction, orthogonal to the easy magnetization axis. Variation of the magnetic field strength in the angular (canted) phase of the SRT causes magnetization rotation without changing its magnitude. The charge current excited by the spin-to-charge conversion is orthogonal to the magnetization. As a result, THz polarization rotates synchronously with magnetization when magnetic field strength changes. Importantly, the radiation intensity does not change in this case. Control of polarization by SRT is applicable regardless of the spintronic mechanism of the THz emission, provided that the polarization direction is determined by the magnetic moment orientation. The results obtained open the prospect for the development of the SRT approach for THz emission control.

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Section: Introductionmentioning

confidence: 99%

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Khusyainov

Ovcharenko

Gaponov

et al. 2021

Sci Rep

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“…This, in particular, should result in concentric ringlike structures with switched and nonswitched areas, which are a characteristic feature of precessional switching driven by spatially inhomogeneous stimuli [62][63][64]. Detection of such switching requires single-shot pump-probe imaging [34], for which the strength of the magneto-optical signal in a Co 40 Fe 40 B 20 /BaTiO 3 structure is insufficient. Nevertheless, we argue that the noticeable decrease in the detected amplitude of the precession at applied fields exceeding 30 mT seen in our experiments is a manifestation of precessional switching of magnetization triggered by an ultrafast decrease in the magnetoelastic parameter.…”

Section: Magnetization Dynamics Triggered By Change Of Magnetoelasmentioning

confidence: 99%

“…Alternatively, ultrafast optically driven changes of the FE state could lead to high-amplitude dynamic strain modulations [33] and, thus, alter the magnetization state of a magnetostrictive layer. However, ultrafast optical control of FE polarization remains challenging [34]. Optically induced strain was considered as a tool to modify the magnetic anisotropy in FM-photostrictive composites in Ref.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

et al. 2020

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Using a magneto-optical pump-probe technique with micrometer spatial resolution, we show that magnetization precession can be launched in individual magnetic domains imprinted in a Co 40 Fe 40 B 20 layer by elastic coupling to ferroelectric domains in a BaTiO 3 substrate. The dependence of the precession parameters on the strength and orientation of the external magnetic field reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of Co 40 Fe 40 B 20 by approximately 27% along with 10% ultrafast demagnetization triggers the magnetization precession. The relation between the laser-induced reduction of the magnetoelastic coupling and the demagnetization is approximated by an n(n + 1)/2 law with n ≈ 2. This correspondence confirms the thermal origin of the laser-induced anisotropy change. Based on analysis and modeling of the excited precession, we find signatures of laser-induced precessional switching, which occurs when the magnetic field is applied along the hard magnetization axis and its value is close to the effective magnetoelastic anisotropy field. The precessionexcitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics and switching in composite multiferroics with spatial selectivity.

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“…Highly efficient terahertz (THz) sources with dynamic polarization modulation offer multifaceted capabilities for investigating the mesoscale chiral architectures in (bio)materials and have many promising applications in resonant and nonresonant optical excitations, [ 1 ] THz circular dichroism (TCD) spectroscopy, [ 2 ] ultrafast spintronic THz optospintronics, [ 3,4 ] and so on. Conventional methods for generating elliptically polarized THz waves are limited and exist the shortcomings of narrow bandwidth and high loss.…”

Section: Introductionmentioning

confidence: 99%

Efficient Generation and Arbitrary Manipulation of Chiral Terahertz Waves Emitted from Bi₂Te₃–Fe Heterostructures

Chen

Wang

Chun

et al. 2021

Advanced Photonics Research

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Polarization arbitrary manipulated terahertz (THz) pulses with a prescribed amplitude temporal evolution and deposited electric‐field vectors can promote many disruptive technologies and enable enormous applications in polarization‐sensitive THz spectroscopy and imaging, ultrafast THz optospintronics, information encryption, and space exploration. However, the severe shortage of dynamically tunable THz polarization devices has impeded the proliferation of THz science and technology. Herein, a method of efficient generation and arbitrary manipulation of chiral THz waves in the topological insulator (TI)–iron (Fe) heterostructures through delicately engineering the linear photogalvanic effect (LPGE) and spin‐to‐charge conversion (SCC) effect induced by femtosecond laser pulses is proposed and demonstrated. Utilizing the intrinsic merits of optical‐controlled LPGE and magnetic field direction‐adjusted SCC effect, the TI–Fe can radiate chiral THz waves with arbitrarily tailored chirality and ellipticity. To verify the capability of such a novel chiral THz source, helical substructure associates THz circular dichroism spectroscopy is implemented on several (bio)materials, exemplified by the beetle exoskeletons. Furthermore, ultrafast switching between two THz chirality states can be realized by a double‐pulse excitation scheme. Such versatile chiral THz emitters with high efficiency and easy integration may have some disruptive applications.

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Fundamentals and perspectives of ultrafast photoferroic recording

Cited by 68 publications

References 213 publications

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Efficient Generation and Arbitrary Manipulation of Chiral Terahertz Waves Emitted from Bi₂Te₃–Fe Heterostructures

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Fundamentals and perspectives of ultrafast photoferroic recording

Cited by 68 publications

References 213 publications

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Efficient Generation and Arbitrary Manipulation of Chiral Terahertz Waves Emitted from Bi2Te3–Fe Heterostructures

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Efficient Generation and Arbitrary Manipulation of Chiral Terahertz Waves Emitted from Bi₂Te₃–Fe Heterostructures