Nonlinear magneto-optical diffraction from periodic domain structures in magnetic films

Lyubchanskii, I.L.; Rasing, T.H.M.

doi:10.1063/1.123700

Cited by 23 publications

(12 citation statements)

References 24 publications

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“…[18][19][20][21][22][23][24][25][26][27][28] In these studies, the periodic structures that contribute to the nonlinear effect in diffraction can either be crystalline structures, 18,19 or be the ones induced by the physical effects such as magnetic field 20,21 and acoustic field. 22,23 In most cases, nonlinear optical materials such as thin coating 24 and nanoparticles 25 are used for making the periodic structures.…”

Section: A Nonlinear Effect In Diffractionmentioning

confidence: 99%

Experimental observation of acoustic sub-harmonic diffraction by a grating

Liu

Declercq

2014

Journal of Applied Physics

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A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies.This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating. V C 2014 AIP Publishing LLC.

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Section: A Nonlinear Effect In Diffractionmentioning

confidence: 99%

Experimental observation of acoustic sub-harmonic diffraction by a grating

Liu

Declercq

2014

Journal of Applied Physics

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“…9. If this period is comparable with the wavelength of the second harmonic radiation one should expect the appearance of nonlinear diffraction from such a regular dislocation array, similar to the nonlinear diffraction from periodic structures of ferroelectric 17 or magnetic 18 domains.…”

Section: ͑9͒mentioning

confidence: 99%

Second-harmonic generation from realistic film–substrate interfaces: The effects of strain

Lyubchanskii

Rasing

Jeong

et al. 2000

Applied Physics Letters

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The optical second-harmonic generation from a thin crystalline film on a substrate is theoretically investigated for both s and p polarized incident light. The contributions of lattice misfit strain as well as of misfit dislocation strain to the second-order nonlinear optical susceptibility are described using a nonlinear photoelastic tensor and can be separated by a polarization analysis of the scattered light at the second harmonic frequency. For the s(ω)→s(2ω) and p(ω)→s(2ω) scattering geometries, the nonlinear optical signal will be determined by dislocation strain only, whereas for the s(ω)→p(2ω) and p(ω)→p(2ω) geometries both lattice misfit strain and misfit dislocation strain will contribute.

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“…For an ordered array of magnetic dots, for example a square dot lattice, it is possible to observe an effect of nonlinear diffraction similar to the phenomena in one-dimensional periodic domain structures as studied in Ref. [17]. A detailed analysis of the conditions to observe the last effect will be published elsewhere.…”

mentioning

confidence: 97%

“…Nonlinear optical methods are even more effective than their linear counterparts to investigate magnetic materials, because the nonlinear magneto-optical response is more sensitive for magnetic inhomogeneities, interfaces and superstructures [14]. Magnetization-induced optical second harmonic generation (MSHG) is a very powerful method for the investigation of uniform [14] and non-uniform magnetic structures like magnetic domains and magnetic domain walls [15,16] as well as ordered magnetic structures [17,18]. A polarization analysis of the MSHG signal allows to determine the different components of the magnetization in a magnetic dot.…”

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Second Harmonic Light Scattering by Magnetic Dots

Lyubchanskii

Guslienko

Rasing

2002

phys. stat. sol. (a)

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Subject classification: 75.75.+a; 78.20.LsThe second harmonic light scattering by uniformly and non-uniformly magnetized magnetic dots is theoretically investigated for both s-and p-polarized incident light. It is shown that the contribution of "in plane" and "out of plane" magnetization components of dots can be separated by a polarization analysis of the scattered light at the second harmonic frequency.During the last few years artificial magnetic superstructures of sub-micron sizes were produced using X-ray and electron lithography (see, for example, the review paper [1]). The physical properties of such systems of magnetic particles, or magnetic dots, are intensively investigated because patterned structures are promising for applications as information storage devices [2]. In soft magnetic materials like permalloy (Ni-Fe) there are different possibilities for in-dot magnetization distributions, for example single-domain state or curling state [3]. Usually the isolated cylindrical dots are in a single-domain state ("flower" or nearly uniform state) when the dot radius R < R c (L), where R c (L) is the critical radius and L is the dot thickness [4]. As was shown in Ref.[3], for R > R c (L) a magnetic vortex is formed inside a dot. The vortex states in cylindrical dots were observed in supermalloy (Ni-Fe-Mo) via measurements of hysteresis loops [5] and also for polycrystalline Co [6] as well as in Ni-Fe [7] via magnetic force microscopy. In the case of a two-dimensional ordered dot array, for example, a square magnetic lattice, for typical inter-dot distances the magnetic interaction between the vortex dots is negligibly small and it is possible to consider a magnetic dot in a lattice as an independent particle [8].An effective physical tool for the investigation of regular magnetic dots is magnetooptics [9-13]. Nonlinear optical methods are even more effective than their linear counterparts to investigate magnetic materials, because the nonlinear magneto-optical response is more sensitive for magnetic inhomogeneities, interfaces and superstructures [14]. Magnetization-induced optical second harmonic generation (MSHG) is a very powerful method for the investigation of uniform [14] and non-uniform magnetic structures like magnetic domains and magnetic domain walls [15,16] as well as ordered magnetic structures [17,18]. A polarization analysis of the MSHG signal allows to determine the different components of the magnetization in a magnetic dot. Recent publications devoted to measurements of MSHG in Ni 81 Fe 19 films showed a sufficient nonlinear optical response for excitation with a Ti:sapphire laser with a fundamental wavelength l 0 = 809 nm [19,20].

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Nonlinear magneto-optical diffraction from periodic domain structures in magnetic films

Abstract: Please be advised that this information was generated on 2018-05-12 and may be subject to change.

Cited by 23 publications

References 24 publications

Experimental observation of acoustic sub-harmonic diffraction by a grating

Experimental observation of acoustic sub-harmonic diffraction by a grating

Second-harmonic generation from realistic film–substrate interfaces: The effects of strain

Second Harmonic Light Scattering by Magnetic Dots

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