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

2020 ◽  
Vol 65 (4) ◽  
pp. 310
Author(s):  
V. Stashchuk ◽  
V. Stukalenko ◽  
S. Rozouvan ◽  
V. Lysiuk
Keyword(s):  
Experimental Data ◽  
Refractive Index ◽  
Kerr Effect ◽  
Theoretical Models ◽  
Optical Kerr Effect ◽  
Wide Spectral Range ◽  
Free Electrons ◽  
Methods Of Calculation ◽  
Magneto Optical Kerr Effect ◽  
Kerr Angle

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.

scholarly journals Magnetic interaction at the interface of epitaxial manganite film and (TbCo2/FeCo)n superlattice

2018 ◽  
Vol 185 ◽  
pp. 01007
Author(s):  
Alexander S. Grishin ◽  
Gennady A. Ovsyannikov ◽  
Alexey A. Klimov ◽  
Viktor V. Demidov ◽  
Karen Y. Constantinian ◽  
...  
Keyword(s):  
Thin Film ◽  
Experimental Data ◽  
Magnetization Reversal ◽  
Kerr Effect ◽  
Magnetic Interaction ◽  
Optical Kerr Effect ◽  
Manganite Film ◽  
Magnetic Heterostructures ◽  
Magneto Optical Kerr Effect

Hybrid magnetic heterostructures made of epitaxial manganite La0.7Sr0.3MnO3 thin film and intermetallic superlattice (TeCo2/FeCo)n were prepared on orthorhombic NdGaO3 substrates and characterized by means of magneto-optical Kerr effect and magnetoresistance. Experimental data show that magnetic interaction between La0.7Sr0.3MnO3 and (TeCo2 /FeCo)n is of the antiferromagnetic type. The features observed in magnetotransport characteristics are caused by the magnetization reversal at the interface between manganite thin film and intermetallic superlattice.

scholarly journals High-Refractive-Index Materials for Giant Enhancement of the Transverse Magneto-Optical Kerr Effect

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 952
Author(s):  
Edwin Moncada-Villa ◽  
J. Ricardo Mejía-Salazar
Keyword(s):  
Refractive Index ◽  
Data Storage ◽  
Kerr Effect ◽  
High Refractive Index ◽  
Dielectric Substrate ◽  
Optical Kerr Effect ◽  
Plasmonic Structures ◽  
Optical Effects ◽  
Magneto Optical Kerr Effect ◽  
High Level

The ability of plasmonic structures to confine and enhance light at nanometer length scales has been traditionally exploited to boost the magneto-optical effects in magneto-plasmonic structures. These platforms allows for light control via externally applied magnetic fields, which is of prime importance for sensing, data storage, optical-isolation, and telecommunications applications. However, applications are hindered by the high-level of ohmic losses associated to metallic and ferromagnetic components. Here, we use a lossless all-dielectric platform for giant enhancement of the magneto-optical effects. Our structure consists of a high-refractive index dielectric film on top of a magnetic dielectric substrate. We numerically demonstrate an extraordinarily enhanced transverse magneto-optical Kerr effect due to the Fabry–Perot resonances supported by the high-refractive index slab. Potential applications for sensing and biosensing are also illustrated in this work.

Full-Potential Study of the Magneto-Optical Kerr Effect for AuMnSb and AuMnSn

2013 ◽  
Vol 750-752 ◽  
pp. 941-945 ◽  
Author(s):  
Xue Fu Shang ◽  
Ya Wei Wang ◽  
Ming Qiu Tan
Keyword(s):  
Kerr Effect ◽  
Density Functional ◽  
Optical Kerr Effect ◽  
Full Potential ◽  
Functional Theory ◽  
Augmented Plane Wave ◽  
The Density Functional Theory ◽  
Magneto Optical Kerr Effect ◽  
Kerr Angle ◽  
Linearized Augmented Plane Wave

The magneto-optical Kerr effect (MOKE) for both Heusler type alloys (AuMnSb and AuMnSn) were studied using the full-potential linearized augmented plane-wave (FP-LAPW) method, based on the density functional theory implemented in the WIEN2k code. The differences with previous calculations on the Kerr spectra have been found explicitly. At proper Lorentzian such asδ= 0.4 eV, the calculated Kerr angle of AuMnSn reaches its maxima +0.3° near 0.6 eV and-0.5° at 5.2 eV, respectively while the MOKE spectra of AuMnSb exhibit less prominent Peaks (+0.5° at 0.3 eV, -1.9° at 0.9 eV, -1.0° at 2.4 eV and-2.0° at 5.3 eV). The results on the spectra in this work showed quite a lot differences with all previous all-electron calculations. It is concluded that the contribution from Sb (or Sn) site to the magneto-optical kerr effect is quite crucial in Heuslar alloys.

Magneto-optical properties of two-layer film systems based on Fe and Cr

2020 ◽  
Vol 34 (27) ◽  
pp. 2050251
Author(s):  
Oleksandr Bezdidko ◽  
Shkurdoda Yuriy ◽  
Olena Fedchenko ◽  
Iryna Cheshko ◽  
Serhiy Protsenko
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Spin Valve ◽  
Protective Layer ◽  
Optical Kerr Effect ◽  
Multilayer Systems ◽  
Magneto Optical Kerr Effect ◽  
Kerr Angle ◽  
Granular Alloys

The results of the investigation of two-layer Fe/Cr systems using the magneto-optical Kerr effect (MOKE) are presented in this paper. The samples were obtained by thermal evaporation in a vacuum with a thickness of individual layers from 2 nm to 50 nm. It was found that the presence of the Cr layer significantly affects the values of the coercivity and the Kerr angle. At a substrate temperature of 450 K, the value of the coercivity is almost half that of the same sample obtained at room temperature of the substrate. In addition, the influence of the order of deposition of layers, as well as the effect of a thin gold protective layer on the parameters measured by the Kerr method, is shown. These studies have shown that the MOKE can be used as an additional method for studying the composition of multilayer systems, granular alloys and spin-valve systems, using specific software methods.

Photo-Induced Magneto-Optical Kerr Effect in Europium Sulfide EuS

2020 ◽  
Vol 62 (9) ◽  
pp. 1619-1623
Author(s):  
P. A. Usachev ◽  
V. N. Katz ◽  
V. V. Pavlov
Keyword(s):  
Kerr Effect ◽  
Optical Kerr Effect ◽  
Europium Sulfide ◽  
Magneto Optical Kerr Effect
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