Ultrafast magnetostriction and phonon-mediated stress in a photoexcited ferromagnet

Schmising, Clemens von Korff; Harpoeth, A.; Zhavoronkov, N.; Ansari, Z.; Aku-Leh, C.; Woerner, M.; Elsaesser, Thomas; Bargheer, Matias; Schmidbauer, M.; Vrejoiu, Ionela; Hesse, D.; Alexe, Marin

doi:10.1103/physrevb.78.060404

Cited by 57 publications

(48 citation statements)

References 25 publications

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“…The buildup kinetics of stress is identical in the paramagnetic and ferromagnetic phase as is the phase of the SL oscillations [35]. Thus, the rise time τ mag of the magnetostrictive stress is very similar to that of the nonequilibrium phonon contribution, i.e., 200 fs < τ mag < 700 fs.…”

Section: Ultrafast Magnetostriction In Sromentioning

confidence: 75%

“…Fig. 7(b)) [35]. Such excitation generates a uniaxial stress inducing lattice motions of the SRO layers.…”

Section: Ultrafast Magnetostriction In Sromentioning

confidence: 98%

“…The uniaxial stress is due to a nonequilibrium phonon population generated by electron cooling and, in the ferromagnetic phase, to magnetostriction. Carrier cooling in SRO as in other metals, occurs on a subpicosecond time scale which has been studied with our sample in independent all-optical experiments [35].…”

Section: Ultrafast Magnetostriction In Sromentioning

confidence: 99%

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Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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Femtosecond x-ray diffraction provides direct insight into the ultrafast reversible lattice dynamics of materials with a perovskite structure. Superlattice (SL) structures consisting of a sequence of nanometer-thick layer pairs allow for optically inducing a tailored stress profile that drives the lattice motions and for limiting the influence of strain propagation on the observed dynamics. We demonstrate this concept in a series of diffraction experiments with femtosecond time resolution, giving detailed information on the ultrafast lattice dynamics of ferroelectric and ferromagnetic superlattices. Anharmonically coupled lattice motions in a SrRuO 3 /PbZr 0.2 Ti 0.8 O 3 (SRO/PZT) SL lead to a switch-off of the electric polarizations on a time scale of the order of 1 ps. Ultrafast magnetostriction of photoexcited SRO layers is demonstrated in a SRO/SrTiO 3 (STO) SL.

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Section: Ultrafast Magnetostriction In Sromentioning

confidence: 75%

“…Fig. 7(b)) [35]. Such excitation generates a uniaxial stress inducing lattice motions of the SRO layers.…”

Section: Ultrafast Magnetostriction In Sromentioning

confidence: 98%

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Ultrafast structural dynamics of perovskite superlattices

et al. 2009

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“…These materials exhibit large electron-phonon coupling parameters, large electro-mechanical response and also augmented piezoelectric coefficients. Hence they open new pathways for exciting and controlling lattice and electron dynamics simultaneously [131,[143][144][145]. Coherent phonon dynamics in topological insulators is also a subject of active research [146][147][148][149] where the electron-phonon coupling appears to set a limit on the natural spin polarized surface electrons transport [150,151].…”

Section: Coherent Phonon Sources: Electron-photon-phonon Interactionsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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“…In the case of CFO mesocrystal-embedded in SRO matrix reported by Liu et al, the SRO matrix inherently shows a large photostrictive effect, an expansion of lattice under illumination. [23] From the investigation of ultrafast XRD, SRO exhibits a large photon-induced lattice expansion of 0.5%-1.5% under the laser fluence of 3-15 mJ/cm 2 [24][25][26] , implying that the compressive strain of CFO (∼1.2% in SRO matrix) could be fully relaxed under a threshold of laser fluence. This concept was proven by a combination of the magneto-optic Kerr effect (MOKE) measurement and magnetic force microscopy (MFM).…”

Section: Mesocrystals In Oxide Matricesmentioning

confidence: 99%

Mesocrystal-embedded functional oxide systems

2016

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Mesocrystal-a new class of crystals compared with conventional single crystals and randomly distributed nanocrystal systems-has captured significant attention in recent decades. Current studies have been focused on the advanced synthesis as well as the intriguing properties of mesocrystal. In order to create new opportunities upon functional mesocrystals, they can be regarded as a new functional entirety when integrated with unique matrix environments. The elegant combination of mesocrystals and matrices has enabled researchers to realize enthralling tunabilities and to derive new functionalities that cannot be found in individual components. Therefore, mesocrystal-embedded system forms a new playground towards multifunctionalities. This review article delivers a general roadmap that portrays the enhancement of intrinsic properties and new functionalities driven by novel mesocrystal-embedded oxide systems. An in-depth understanding and breakthroughs achieved in mesocrystal-embedded oxide systems are highlighted. This article concludes with a brief discussion on potential directions and perspectives along this research field.

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Ultrafast magnetostriction and phonon-mediated stress in a photoexcited ferromagnet

Cited by 57 publications

References 25 publications

Ultrafast structural dynamics of perovskite superlattices

Ultrafast structural dynamics of perovskite superlattices

Nanophononics: state of the art and perspectives

Mesocrystal-embedded functional oxide systems

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