Time-resolved demagnetization in by phase-sensitive second harmonic generation

Satoh, Takuya; Aken, B.B. van; Duong, Nguyen Phuc; Lottermoser, Thomas; Fiebig, Manfred

doi:10.1016/j.jmmm.2006.10.630

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…Though the review did not cover other types of SHG interactions in detail, electric‐dipole SHG involving spin interactions, as well as magnetic dipole SHG interactions have been widely used to probe magnetic materials. SHG spectroscopy performed with varying incident wavelengths allows for the determination of electronic resonances and magnetic resonances, as well as distinguish ferroelectric and magnetic phase transitions and domain structures in multiferroic materials …”

Section: Conclusion and Future Outlookmentioning

confidence: 99%

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Probing Ferroelectrics Using Optical Second Harmonic Generation

Denev

Lummen

Barnes

et al. 2011

Journal of the American Ceramic Society

280

307

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Nonlinear optics is an essential component of modern laser systems and optoelectronic devices. It has also emerged as an important tool in probing the electronic, vibrational, magnetic, and crystallographic structure of materials ranging from oxides and metals, to polymers and biological samples. This review focuses on the specific technique of optical second harmonic generation (SHG), and its application in probing ferroelectric complex oxide crystals and thin films. As the dominant SHG interaction mechanism exists only in materials that lack inversion symmetry, SHG is a sensitive probe of broken inversion symmetry, and thus also of bulk polar phenomena in materials. By performing in-situ SHG polarimetry experiments in different experimental conditions such as sample orientation, applied electric field, and temperature, one can probe ferroelectric hysteresis loops and phase transitions. Careful modeling of the polarimetry data allows for the determination of the point group symmetry of the crystal. In epitaxial thin films with a two-dimensional arrangement of well-defined domain orientations, one can extract information about intrinsic material properties such as nonlinear coefficients, as well as microstructural information such as the local statistics of the different domain variants being probed. This review presents several detailed examples of ferroelectric systems where such measurements and modeling are performed. The use of SHG microscopic imaging is discussed, and its ability to reveal domain structures and phases not normally visible with linear optics is illustrated.

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Section: Conclusion and Future Outlookmentioning

confidence: 99%

“…The SHG processes that involve the magnetic field of light are typically weaker; however, they can be sensitive to time reversal symmetry, and hence to the magnetic structure of materials. Thus, SHG has been used extensively to study magnetic and multiferroic materials as well . A chiral structure intrinsically breaks inversion symmetry.…”

Section: Introductionmentioning

confidence: 99%

Probing Ferroelectrics Using Optical Second Harmonic Generation

Denev

Lummen

Barnes

et al. 2011

Journal of the American Ceramic Society

280

307

View full text Add to dashboard Cite

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“…where RT stands for room temperature; t m denotes the demagnetization time, which is in AFM compounds typically a few ps [25]; and t d is the diffusion time constant, which lies in the ns regime. For the sake of simplicity of our model, we do not take into account the imaginary component of the nonlinear refractive index.…”

Section: Modeling the Shg Response To Optical Excitation Of A Spatmentioning

confidence: 99%

Coherent acoustic perturbation of second-harmonic generation in NiO

Huber¹,

Ferrer²,

Kubacka³

et al. 2015

Phys. Rev. B

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We investigate the structural and magnetic origins of the unusual ultrafast second-harmonic-generation (SHG) response of femtosecond-laser-excited nickel oxide (NiO) previously attributed to oscillatory reorientation dynamics of the magnetic structure induced by d-d excitations. Using time resolved x-ray diffraction from the ( ) magnetic planes, we show that changes in the magnitude of the magnetic structure factor following ultrafast optical excitation are limited to F m / F m = 1.5% in the first 30 ps. An extended investigation of the ultrafast SHG response reveals a strong dependence on wavelength as well as characteristic echoes, both of which give evidence for an acoustic origin of the dynamics. We therefore propose an alternative mechanism for the SHG response based on perturbations of the nonlinear susceptibility via optically induced strain in a spatially confined medium. In this model, the two observed oscillation periods can be understood as the times required for an acoustic strain wave to traverse one coherence length of the SHG process in either the collinear or anticollinear geometries.

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“…8) and Cr 2 O 3 . 45 A fast (over a time scale of 300 fs) and strong suppression of the magnetic order under the action of a femtosecond laser pulse has been found recently in copper oxide CuO. 46 Whereas the mechanisms of these effects is not as clear as for transition metals, their existence for different compounds is undoubtful.…”

Section: A Spin Quenchingmentioning

confidence: 99%

Longitudinal magnetization reversal in ferromagnets with Heisenberg exchange and strong single-ion anisotropy

et al. 2013

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We analyze theoretically the novel pathway of ultrafast spin dynamics for ferromagnets with high enough single-ion anisotropy. This longitudinal spin dynamics includes the coupled oscillations of the modulus of the magnetization together with the quadrupolar spin variables, which are expressed through quantum expectation values of operators bilinear on the spin components. Even for a simple single-element ferromagnet, such dynamics can lead to a magnetization reversal under the action of an ultrashort laser pulse.

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Time-resolved demagnetization in by phase-sensitive second harmonic generation

Cited by 4 publications

References 13 publications

Probing Ferroelectrics Using Optical Second Harmonic Generation

Probing Ferroelectrics Using Optical Second Harmonic Generation

Coherent acoustic perturbation of second-harmonic generation in NiO

Longitudinal magnetization reversal in ferromagnets with Heisenberg exchange and strong single-ion anisotropy

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