Fast Optical Control of Spin in Semiconductor Interfacial Structures

Nádvorník, Lukáš; Surýnek, Miloslav; Olejník, K.; Novák, V.; Wunderlich, J.; Trojánek, F.; Jungwirth, T.; Němec, Petr

doi:10.1103/physrevapplied.8.034022

Cited by 3 publications

(2 citation statements)

References 37 publications

(103 reference statements)

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“…In Fig. 4(b) we show the experimental data measured by these two filtration methods, which demonstrate the very slow damping of the electron spin precession in the studied sample [15,24]. Interestingly, the data measured by the spectral-filtration have a larger amplitude of the measured MO signal.…”

Section: Heterostructurementioning

confidence: 86%

“…4(e). This procedure is extremely useful in the case of the studied material system where the observed long-range and high-speed electronic spin-transport is present only in a very thin layer of GaAs close to the GaAs/AlGaAs interface, which is formed by a built-in electric field that is separating the photogenerated electrons and holes [15,24]. The standard (time-unresolved) experimental techniques for measuring the MOKE spectrum [26] would provide information only about the spatially-averaged magnetooptical properties of the sample, which would be the one corresponding to undoped GaAs in our case.…”

Section: Heterostructurementioning

confidence: 99%

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Quasi-nondegenerate pump–probe magnetooptical experiment in GaAs/AlGaAs heterostructure based on spectral filtration

et al. 2020

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We report on a quasi-nondegenerate pump–probe technique that is based on spectral-filtration of femtosecond laser pulses by a pair of mutually-spectrally-disjunctive commercially available interference filters. The described technique enables to obtain pump and probe pulses with wavelengths that are spectrally close but distinct. These contradictory requirements, which are dictated, for example, by a suppression of stray pump photons from the probe beam in spin-sensitive magneto-optical experiments in non-magnetic semiconductors, can be fulfilled at very low cost and basically no requirement on space. Especially the second feature is important in pump–probe microscopy where collinear propagation of pump and probe pulses is dictated by utilization of a microscopic objective and where the setups are typically quite complex but suffer from a limited size of optical breadboards. Importantly, this spectral-filtration of 100 fs long laser pulses does not affect considerably the resulting time-resolution, which remains well below 500 fs. We demonstrate the practical applicability of this technique by performing spin-sensitive magnetooptical Kerr effect (MOKE) experiment in GaAs/AlGaAs heterostructure, where a high-mobility spin system is formed after optical injection of electrons at wavelengths close to the MOKE resonance. In particular, we studied the time- and spatial-evolutions of spin-related (MOKE) and charge-related (reflectivity) signals. We revealed that they evolve in a similar but not exactly the same way which we attributed to interplay of several electron many-body effects in GaAs.

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Section: Heterostructurementioning

confidence: 86%

Section: Heterostructurementioning

confidence: 99%

Quasi-nondegenerate pump–probe magnetooptical experiment in GaAs/AlGaAs heterostructure based on spectral filtration

et al. 2020

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Mn valence state mediated room temperature ferromagnetism in nonpolar Mn doped GaN

Wadekar

Chang

Zheng

et al. 2019

Applied Surface Science

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Investigation of magnetic anisotropy and heat dissipation in thin films of compensated antiferromagnet CuMnAs by pump–probe experiment

Surýnek

Saidl

Kašpar

et al. 2020

Journal of Applied Physics

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We recently reported on a method to determine the easy axis position in a 10 nm thick film of the fully compensated antiferromagnet CuMnAs. The film had a uniaxial magnetic anisotropy and the technique utilized a magneto-optical pump and probe experiment [Nature Photonics 11, 91 (2017)]. In this contribution we discuss the applicability of this method for the investigation of a broader set of epitaxial CuMnAs films having different thicknesses. This work reveals that the equilibrium magnetic anisotropy can be studied only in samples where this anisotropy is rather strong. However, in the majority of CuMnAs films, the impact of a strong pump pulse induces nano-fragmentation of the magnetic domains and, therefore, the magnetic anisotropy measured by the pump-probe technique differs substantially from that in the equilibrium conditions. We also demonstrate that optical pump-probe experiment can be used very efficiently to study the local heating and heat dissipation in CuMnAs epitaxial layers. In particular, we determined the electron-phonon relaxation time in CuMnAs. We also observed that for a local film heating by a focused laser the thinner films are heated more, but the heat is dissipated considerably faster than in the case of thicker films. This illustrates that the optical pump-probe experiment is a valuable characterization tool for the heat management optimization in the CuMnAs memory devices and can be applied in a similar way to those used during heat-assisted magnetic recording (HAMR) technology development for the latest generation of hard drive disks.

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Fast Optical Control of Spin in Semiconductor Interfacial Structures

Cited by 3 publications

References 37 publications

Quasi-nondegenerate pump–probe magnetooptical experiment in GaAs/AlGaAs heterostructure based on spectral filtration

Quasi-nondegenerate pump–probe magnetooptical experiment in GaAs/AlGaAs heterostructure based on spectral filtration

Mn valence state mediated room temperature ferromagnetism in nonpolar Mn doped GaN

Investigation of magnetic anisotropy and heat dissipation in thin films of compensated antiferromagnet CuMnAs by pump–probe experiment

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