Optical properties and electronic structure of Co- and Fe-based compounds

Lysiuk, V. O.; Rozouvan, Stanislav; Staschuk, V. S.

doi:10.1364/josab.35.001628

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…Certainly, Hund's rule formalism should be applied for condensed matter problems as a qualitative approach. The crystal field originated from neighbouring atoms changes molecular orbitals depending on the crystal lattice symmetry [13], and we can talk about quantum number selection rules with some approximation, though in good comparison with experiments for (Co 41 Fe 39 B 20 ) x (SiO 2 ) 100-x amorphous alloy [11].…”

Section: Resultsmentioning

confidence: 91%

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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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Section: Resultsmentioning

confidence: 91%

“…Comparison of the calculated absorption spectra σ(hν) in Fe-Co-B supercell with experimental data testifies that the shapes of energy bands have to be considered also from the viewpoint of selection rules both for the orbital and spin quantum numbers. In this case, the modified Spicer ratio [11] can be written as:…”

Section: Theorymentioning

confidence: 99%

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

Lysiuk¹,

Rozouvan²,

Staschuk³

et al. 2020

SPQEO

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“…The DF of the CoFeB material measured in the mid-infrared (MIR) range in this work, also covers a lacking part in the literature of the spectrum of CoFeB data, which should complement already existing relevant reports of spectroscopy ellipsometry studies in the near infrared and ultraviolet-visible (uv-vis) spectrum of samples based on CoFeB [14][15][16][17], in which the DF was extracted from layers with different Co-Fe proportions and annealing temperature dependent states of crystallinity. CoFeB nanocomposites for magnetic applications have also been studied by optical means [18][19][20][21], including an IR vibrational study of low-dimensional magnetic CoFeB-based materials [22]. In particular, Kravets et al [19], extend their results for CoFe nanoparticles to the infrared where they detect an enlargement of magneto-optical Kerr rotation driven by the localized plasmon resonance of the composite.…”

Section: Introductionmentioning

confidence: 99%

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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Dielectric tensor circular anisotropy in Co- and Fe-based ferromagnetic alloys

2021

Funct.Mater.

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Optical properties and electronic structure of Co- and Fe-based compounds

Cited by 3 publications

References 24 publications

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

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

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

Dielectric tensor circular anisotropy in Co- and Fe-based ferromagnetic alloys

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