Correlation between GMR and nonlinear magneto-optical Kerr effect in granular films

Мурзина, Т. В.; Misuryaev, T.V.; Nikulin, A. A.; Aktsipetrov, O.A.; Güdde, J.

doi:10.1016/s0304-8853(02)01074-0

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…It was found that during the vacuum sublimation the radial-oriented appeared microcrystallized morphology with slightly agglomerated spheroids . The microcrystalline X-ray diffractograms of all of the considered samples are given in Figure .…”

Section: Experimental Measurementsmentioning

confidence: 99%

“…Varying the film thickness was an opportunity to vary the microcrystalline sizes as well as the interface thickness. It is also important that the thin nanoconfined states may be crucial for manifestation of the interesting optical and nonlinear optical properties 1 Typical AFM pictures for two investigated materials; p -therphenyl at the top and p -sexiphenyl at the bottom. …”

Section: Introductionmentioning

confidence: 99%

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Origin of the Photoinduced Optical Second Harmonic Generation Arising in N-Phenyl Microcrystalline Films

2006

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Photoinduced second-order nonlinear optical effects, particularly optical second harmonic generation (SHG) of N-phenyls with different numbers of aromatic rings deposited on glass substrates were studied. As a fundamental beam, a 5-ps pulsed Nd:YAG laser was used. Quantum chemical time-dependent density functional theory (TDDFT) simulations of the nonlinear optical properties were performed. The first-order hyperpolarizabilities of isolated molecules were calculated, under the influence of a polarized pumping beam, to evaluate the role played by the nanointerfaces separating the microcrystallites and the amorphous environment. Consideration was performed within a framework of steady-state Langevin order parameters for amorphous-like films. A strong dependence of the photoinduced SHG versus the number of aromatic rings determining the degree of film crystallinity was shown. A comparison of experimental data and theoretically evaluated results shows that for the photoinduced first-order nonlinear optical effect the dominant contribution is an amorphous-like structural component, unlike the transport properties, where the crucial role is played by the nanointerface region. This may reflect a specific feature of the multiphoton processes in such types of nanointerfaces because of nanoconfined effects.

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Section: Experimental Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Origin of the Photoinduced Optical Second Harmonic Generation Arising in N-Phenyl Microcrystalline Films

2006

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“…The pattern of the field dependences measured at low concentrations (in particular, the absence of hysteresis and of saturation in a field of 15 kOe) is typical of an ensemble of superparamagnetic particles. Magnetization curves of a superparamagnet are described, similar to the case of a paramagnetic material, by the Langevin function [11] with the magnetic moment of a paramagnetic atom replaced by the magnetic moment of a grain given as a single-domain ferromagnetic particle: (6) where µ is the magnetic moment of the grain, H is the magnetic field strength, and T is the temperature.…”

Section: Dielectric Functionsmentioning

confidence: 99%

“…Among them the magnetoresistance effect [1], inverse or positive magnetoresistance [2], spin-dependent electron tunneling, high dielectric losses in the microwave range [3], the anomalous Hall effect [4], and the large magnetorefractive effect [5] should be mentioned. A number of papers aimed at revealing and investigating possible correlations between the magnetic properties, magnetotransport, and linear and nonlinear optical and magnetooptical properties of granular nanostructures have appeared [5][6][7]. Particular attention centers presently on the behavior of nanostructures near the percolation threshold, because in this region the most pronounced changes in their characteristics are observed.…”

Section: Introductionmentioning

confidence: 99%

Optical and magnetooptical properties of CoFeB/SiO2 and CoFeZr/Al2O3 granular magnetic nanostructures

et al. 2004

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-The optical and magnetooptical properties of the new granular nanocomposites (CoFeB)/(SiO 2 ) and (CoFeZr)/(Al 2 O 3 ), which are grains of amorphous ferromagnetic alloys embedded in dielectric matrices, have been studied. The dependence of the optical, magnetooptical, and magnetic properties of the nanocomposites on their qualitative and quantitative composition, as well as on the conditions of their preparation, was investigated. Spectra of the dielectric functions ε = ε 1 -i ε 2 were obtained by the ellipsometric method in the range 0.6-5.4 eV. Above 4.2 eV, the absorption coefficient of the (CoFeB)/(SiO 2 ) composites was found to be close to zero for all magnetic-grain concentrations. The polar Kerr effect measured at a photon energy of 1.96 eV in dc magnetic fields of up to 15 kOe reaches values as high as 0.25 ° -0.3 ° for these nanocomposites and depends only weakly on the conditions of preparation. On the other hand, the (CoFeZr)/(Al 2 O 3 ) nanostructures reveal a considerable difference in the concentration dependences of the Kerr effect between samples prepared in a dc magnetic field and in zero field.

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“…On this front, the combination of magnetic metals with noble metals, such as gold or silver, offers a suitable platform to experimentally explore correlations between composition, magnetotransport, and nonlinear magnetooptical properties with an eye towards applications exploiting such correlated properties, particularly in constrained geometries. To this end, Skumryev et al [1] prepared a class of nanoparticle-matrix materials exhibiting novel exchange bias properties, while Murzina et al [2] have reported on nonlinear magnetooptical properties of AuCo planar structures on Si and granular AgCo films [3]. The Au-Co system offers an opportunity to experimentally study correlated nonlinear magnetooptical and magnetotransport properties of a nanocomposite thin film.…”

Section: Introductionmentioning

confidence: 99%

Experimental Correlation between Nonlinear Optical and Magnetotransport Properties Observed in Au-Co Thin Films

Yang

Kryutyanskiy

Kolmychek

et al. 2016

Journal of Nanomaterials

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Magnetic materials where at least one dimension is in the nanometer scale typically exhibit different magnetic, magnetotransport, and magnetooptical properties compared to bulk materials. Composite magnetic thin films where the matrix composition, magnetic cluster size, and overall composite film thickness can be experimentally tailored via adequate processing or growth parameters offer a viable nanoscale platform to investigate possible correlations between nonlinear magnetooptical and magnetotransport properties, since both types of properties are sensitive to the local magnetization landscape. It has been shown that the local magnetization contrast affects the nonlinear magnetooptical properties as well as the magnetotransport properties in magnetic-metal/nonmagnetic metal multilayers; thus, nanocomposite films showcase another path to investigate possible correlations between these distinct properties which may prove useful for sensing applications.

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Correlation between GMR and nonlinear magneto-optical Kerr effect in granular films

Cited by 7 publications

References 16 publications

Origin of the Photoinduced Optical Second Harmonic Generation Arising in N-Phenyl Microcrystalline Films

Origin of the Photoinduced Optical Second Harmonic Generation Arising in N-Phenyl Microcrystalline Films

Optical and magnetooptical properties of CoFeB/SiO2 and CoFeZr/Al2O3 granular magnetic nanostructures

Experimental Correlation between Nonlinear Optical and Magnetotransport Properties Observed in Au-Co Thin Films

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