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.

Large room-temperature magneto-optical Kerr effect in CuCr2Se4−xBrx (x = 0 and 0.3)

1991 ◽  
Vol 93 ◽  
pp. 207-210 ◽  
Author(s):  
H. Brändle ◽  
J. Schoenes ◽  
P. Wachter ◽  
F. Hulliger ◽  
W. Reim
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect

Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-optical Kerr effect using visible light

2007 ◽  
Vol 91 (5) ◽  
pp. 052507 ◽  
Author(s):  
Ken-ichi Aoshima ◽  
Nobuhiko Funabashi ◽  
Kenji Machida ◽  
Yasuyoshi Miyamoto ◽  
Norikazu Kawamura ◽  
...  
Keyword(s):  
Visible Light ◽  
Kerr Effect ◽  
Spin Valve ◽  
Spin Transfer ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect ◽  
Current Perpendicular To Plane

scholarly journals Room-temperature ultrafast carrier and spin dynamics in GaAs probed by the photoinduced magneto-optical Kerr effect

2001 ◽  
Vol 63 (23) ◽  
Author(s):  
A. V. Kimel ◽  
F. Bentivegna ◽  
V. N. Gridnev ◽  
V. V. Pavlov ◽  
R. V. Pisarev ◽  
...  
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Spin Dynamics ◽  
Optical Kerr Effect ◽  
Ultrafast Carrier ◽  
Magneto Optical Kerr Effect

Morphology and Curie Temperature Changes upon Annealing of Co/W(110)

1997 ◽  
Vol 475 ◽  
Author(s):  
A. Bauer ◽  
A. Mühlig ◽  
T. Günther ◽  
M. Farle ◽  
K. Baberschke ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Ultrathin Films ◽  
Kerr Effect ◽  
Room Temperature ◽  
The Other ◽  
Scanning Tunneling ◽  
Optical Kerr Effect ◽  
Tunneling Microscopy ◽  
Temperature Changes ◽  
Magneto Optical Kerr Effect

ABSTRACTAnnealing of CoAV(110) ultrathin films causes rather strong changes of film morphology and magnetic properties, which has been studied by scanning tunneling microscopy (STM) and alternating-current magneto-optical Kerr effect (ac-MOKE). Annealing above 500 K of room-temperature grown 2 monolayers (ML) thick Co/W(110) films leads to the formation of islands and a decrease of the Curie temperature 7C. At 4 ML, on the other hand, a network of interconnected islands is formed upon annealing, resulting in an enhanced TC. While the increase of TC at 4 ML is explained by an increase of the local film thickness, the anomalous TC behavior at 2 ML is assigned to the occurrence of superparamagnetism.

Large room‐temperature magneto‐optical Kerr effect in CuCr2Se4

1990 ◽  
Vol 56 (26) ◽  
pp. 2602-2603 ◽  
Author(s):  
H. Brändle ◽  
J. Schoenes ◽  
P. Wachter ◽  
F. Hulliger ◽  
W. Reim
Keyword(s):  
Kerr Effect ◽  
Room Temperature ◽  
Optical Kerr Effect ◽  
Magneto Optical Kerr Effect

scholarly journals Asymmetric Hysteresis Loops in Co Thin Films

2020 ◽  
Vol 5 (4) ◽  
pp. 71
Author(s):  
Andrea Ehrmann ◽  
Tomasz Blachowicz
Keyword(s):  
Exchange Bias ◽  
Kerr Effect ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Blocking Temperature ◽  
Optical Kerr Effect ◽  
Thin Film System ◽  
Magnetic Hysteresis Loops ◽  
Magneto Optical Kerr Effect

Asymmetric magnetic hysteresis loops are usually found in exchange bias (EB) systems, typically after field cooling a system below the Néel temperature of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric hysteresis loops may occur due to undetected minor loops or in systems with a rotational anisotropy. Here, we report on an exchange bias thin film system MgO(100)/Co/CoO, examined at room temperature, which is far above the blocking temperature, by the magneto-optical Kerr effect (MOKE). While the longitudinal hysteresis loops partly show steps which are well-known from diverse purely ferromagnetic systems, the transverse hysteresis loops exhibit clear asymmetries, similar to exchange biased systems at low temperatures, and unusual transverse magnetization values at saturation. Since minor loops and a rotational anisotropy can be excluded in this case, this asymmetry can possibly be a residue of the exchange bias coupling at lower temperatures.

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.

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.

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