Ultrafast control of lattice strain via magnetic circular dichroism

Deb, Marwan; Popova, E.; Zeuschner, Steffen Peer; Leitenberger, W.; Keller, N.; Rössle, Matthias; Bargheer, Matias

doi:10.1103/physrevb.103.064301

Cited by 4 publications

(1 citation statement)

References 66 publications

(124 reference statements)

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“…As the local functionalization of materials using fs laser pulsing, achieved purely through lattice reordering, is currently being pursued in a variety of alloy systems, [38][39][40] understanding the limits of such transformations in various material systems is crucial for developing novel techniques in the modulation of functional properties.…”

Section: Discussionmentioning

confidence: 99%

Laser‐Induced Positional and Chemical Lattice Reordering Generating Ferromagnetism

Pflug,

Pablo‐Navarro,

Anwar

et al. 2023

Adv Funct Materials

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Atomic scale reordering of lattices can induce local modulations of functional material properties, such as reflectance and ferromagnetism. Pulsed femtosecond laser irradiation enables lattice reordering in the picosecond range. However, the dependence of the phase transitions on the initial lattice order as well as the temporal dynamics of these transitions remain to be understood. This study investigates the laser‐induced atomic reordering and the concomitant onset of ferromagnetism in thin Fe‐based alloy films with vastly differing initial atomic orders. The optical response to single femtosecond laser pulses on selected prototype systems, one that initially possesses positional disorder, Fe60V40, and a second system initially in a chemically ordered state, Fe60Al40, has been tracked with time. Despite the vastly different initial atomic orders the structure in both systems converges to a positionally ordered but chemically disordered state, accompanied by the onset of ferromagnetism. Time‐resolved measurements of the transient reflectance combined with simulations of the electron and phonon temperatures reveal that the reordering processes occur via the formation of a transient molten state with an approximate lifetime of 200 ps. These findings provide insights into the fundamental processes involved in laser‐induced atomic reordering, paving the way for controlling material properties in the picosecond range.

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Section: Discussionmentioning

confidence: 99%

Laser‐Induced Positional and Chemical Lattice Reordering Generating Ferromagnetism

Pflug,

Pablo‐Navarro,

Anwar

et al. 2023

Adv Funct Materials

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Controlling High-Frequency Spin-Wave Dynamics Using Double-Pulse Laser Excitation

Deb

Popova²,

Jaffrès³

et al. 2022

Phys. Rev. Applied

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Manipulating spin waves is highly required for the development of innovative data transport and processing technologies. Recently, the possibility of triggering high-frequency standing spin waves in magnetic insulators using femtosecond laser pulses was discovered, raising the question about how one can manipulate their dynamics. Here we explore this question by investigating the ultrafast magnetization and spin wave dynamics induced by double-pulse laser excitation. We demonstrate a suppression or enhancement of the amplitudes of the standing spin waves by precisely tuning the time delay between the two pulses. The results can be understood as the constructive or destructive interference of the spin-waves induced by the first and second laser pulses. Our findings open exciting perspectives towards generating singlemode standing spin waves that combine high frequency with large amplitude and low magnetic damping.

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Ultrafast strain excitation in highly magnetostrictive terfenol: Experiments and theory

et al. 2021

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We experimentally and analytically investigate laser excitation of picosecond longitudinal and shear acoustic pulses in highly magnetostrictive Terfenol -TbFe2 -epitaxial thin films. We report a magnetoelastic mechanism for picosecond longitudinal and shear acoustic strain excitation, so-called direct transient demagnetostriction, which denotes the ultrafast laser-induced demagnetization and release of static magnetostrictive built-in strains. From analytical considerations and numerical modeling, we demonstrate that the efficiency of ultrashort longitudinal and shear acoustic strains generation strongly depends on the magnetization orientation with respect to the lattice crystallographic directions. Overall, our study provides insight into ultrafast acoustic waves excitation and detection in all sorts of magnetic materials from laser-based mechanisms.

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Ultrafast control of lattice strain via magnetic circular dichroism

Cited by 4 publications

References 66 publications

Laser‐Induced Positional and Chemical Lattice Reordering Generating Ferromagnetism

Laser‐Induced Positional and Chemical Lattice Reordering Generating Ferromagnetism

Controlling High-Frequency Spin-Wave Dynamics Using Double-Pulse Laser Excitation

Ultrafast strain excitation in highly magnetostrictive terfenol: Experiments and theory

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