Structure and Optical Properties of (Co41Fe39B20)x(SiO2)1–x Nanocomposites

Staschuk, V. S.; Kravets, V. G.; Lysiuk, V. O.; Polyanska, O.P.; Stukalenko, V. V.; Yampolsky, A

doi:10.15407/ujpe62.08.0666

Cited by 4 publications

(7 citation statements)

References 6 publications

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“…Pairs of curves calculated applying different signs in expressions (A-D) and which almost overlap are marked by two numbers each. Some curves are identical [in the case of positive numbers for 2 (1,2) and (11,12), respectively, A, B versions of expression (14) and C, D versions of expression (16)]; the others have the same values, but opposite signs [absolute values (7,8) and (11,12) of C, D, versions of expressions (15) and (16) respectively].…”

Section: Resultsmentioning

confidence: 99%

“…The low-and high-energy spectral limits of the measurements were predisposed by strong absorption bands due to nanocomposites with a high concentration of granules. The real 1 and imaginary 2 parts of diagonal components of the dielectric permittivity tensor˜= 1 − 2 for the model of semiinfinite isotropic medium in contact with air (with refractive index 1) can be determined by the relations [8,21]…”

Section: Methodsmentioning

confidence: 99%

“…For a visible spectral range outside of the strong absorption bands ≫ 0 , we can use (8) to estimate roughly the relation between the values of the diagonal and non-diagonal components of the dielectric tensor with regard for the magnitude of the magnetic field associated with a magnetization of 1 Tesla: / ≈ /( ) ≈ 0.0003. Spectral ellipsometry techniques have been frequently used to explore the electronic structure of highly absorptive ferromagnetic materials.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to obtain the dispersive curves of materials in a broad spectral interval, starting from vacuum ultraviolet wavelengths and ending at the wavelengths corresponding to the intraband transitions of electrons (in most cases, it is in near-infrared spectral region). The most informative dispersive curves from this point of view are the optical conductivity spectral dependences [8] 1 (ℎ ) = 4 0 (ℎ ) (ℎ ),…”

Section: Introductionmentioning

confidence: 99%

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Methods of Calculation of the Magneto-Optical Characteristics of Ferromagnetic Materials

Stashchuk¹,

Stukalenko²,

Rozouvan³

et al. 2020

Ukr. J. Phys.

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We have calculated the optical and magneto-optical properties of ferromagnetics in a wide spectral range hv = 1.24–5.15 eV, by applying theoretical models which were reported earlier in the literature. This allowed us to find a connection between the conductivity and the measured values of the complex Kerr angle Θ in order to establish the most proper technique for processing the experimental data. The behavior of the dispersion curves of diagonal and non-diagonal components of the tensor of optical conductivity depends on the choice of signs of the imaginary parts of a complex Kerr angle and a refractive index, which should be taken into account in the data analysis. The differences between dispersion dependences are insignificant in the region of energies higher than 4.5 eV. In this paper, the classical theory of free electrons in metals has been applied to give more details about the magneto-optical Kerr effect in ferromagnetic samples.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Methods of Calculation of the Magneto-Optical Characteristics of Ferromagnetic Materials

Stashchuk¹,

Stukalenko²,

Rozouvan³

et al. 2020

Ukr. J. Phys.

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“…It is also important to know the nanogranule structure, including their electronic and phase composition. Structural studies must include optical properties as an important component of electronic properties examination [3].…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical properties of nanocomposites (Co41Fe39B20)х(SiO2)100−х

Lysiuk¹,

Rozouvan²,

Staschuk³

et al. 2020

SPQEO

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Magneto-optics properties of (Co 41 Fe 39 B 20) x (SiO 2) 100−x alloys were studied applying both experimental spectral ellipsometry and quantum mechanical theory (incl. molecular calculus) approaches. Magneto-optics (MO) properties of the alloys were derived from the measured parameters of reflected elliptically polarized light. The experimental data were explained applying selection rules for the magnetic quantum number. Theoretical approach based on electron gas in a metal with angular momentum coupled to magnetic field demonstrated applicability of the magnetic quantum number and Hund's rule for ascertaining the MO alloys properties. In this modeling, the magneto-optics properties of ferromagnetic alloys can be explained being based on derivations for the magnetic quantum number selection rules. Hund's rule directly influences the dielectric tensor off-diagonal elements signs. The nonrelativistic Schrödinger equation for the Co 2 Fe 2 B alloy was numerically solved taking into account spins of Co and Fe atoms as well as orbital moments of wave functions in order to check the theoretical approach. As a result, the MO dispersion curves can be theoretically evaluated using the modified Spicer ratio that includes density of states functions with specific azimuthal and spin quantum numbers.

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Mid-infrared optical properties of non-magnetic-metal/CoFeB/MgO heterostructures

Flores-Camacho

Rana

Balderas‐Navarro

et al. 2023

J. Phys. D: Appl. Phys.

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We report on the optical characterization of non-magnetic metal/ferromagnetic (Co20Fe60B20)/MgOheterostructures and interfaces by using mid infrared spectroscopic ellipsometry at roomtemperature. We extracted for the mid-infrared range the dielectric function of Co20Fe60B20, thatis lacking in literature, from a multisample analysis.From the optical modeling of the heterostructures we detected and determined the dielectric tensor properties of a two-dimensionalelectron gas (2DEG) forming at the non-magnetic metal and the CoFeB interface.These properties comprise independent Drude parameters for the in-plane and out-of plane tensor components, with the latterhaving an epsilon-near-zero frequency within our working spectral range. A feature assigned to spin-orbit coupling (SOC) is identified.Furthermore, it is found that both, the interfacial properties, 2DEG Drude parameters and SOC strength,and the apparent dielectric function of the MgO layer depend on the type of the underlying nonmagnetic metal,namely, Pt, W, or Cu.The results reported here should be useful in tailoring novel phenomena in such types of heterostructures by assessing their optical response noninvasively, complementing existing characterization tools such as angle-resolved photoemission spectroscopy, and those related to electron/spin transport.

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Structure and Optical Properties of (Co41Fe39B20)x(SiO2)1–x Nanocomposites

Cited by 4 publications

References 6 publications

Methods of Calculation of the Magneto-Optical Characteristics of Ferromagnetic Materials

Methods of Calculation of the Magneto-Optical Characteristics of Ferromagnetic Materials

Magneto-optical properties of nanocomposites (Co41Fe39B20)х(SiO2)100−х

Mid-infrared optical properties of non-magnetic-metal/CoFeB/MgO heterostructures

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