Kerr rotation enhancement and correlation between perpendicular anisotropy and Kerr effect in PtCu(Al,Ag)/Co multilayers

1996 ◽  
Vol 80 (7) ◽  
pp. 3957-3961 ◽  
Author(s):  
Y. J. Wang ◽  
Z. H. Guo ◽  
D. K. Zhu ◽  
C. H. Shang
Keyword(s):  
Kerr Effect ◽  
Perpendicular Anisotropy ◽  
Kerr Rotation

scholarly journals Design and Modelling of a Novel Integrated Photonic Device for Nano-Scale Magnetic Memory Reading

2020 ◽  
Vol 10 (22) ◽  
pp. 8267
Author(s):  
Figen Ece Demirer ◽  
Chris van den Bomen ◽  
Reinoud Lavrijsen ◽  
Jos J. G. M. van der Tol ◽  
Bert Koopmans
Keyword(s):  
Kerr Effect ◽  
Signal To Noise Ratio ◽  
Magnetic Memory ◽  
Polarization Converter ◽  
Magnetization Direction ◽  
Kerr Rotation ◽  
Photonic Device ◽  
Guided Mode ◽  
All Optical ◽  
Current Design

Design and simulations of an integrated photonic device that can optically detect the magnetization direction of its ultra-thin (∼12 nm) metal cladding, thus ‘reading’ the stored magnetic memory, are presented. The device is an unbalanced Mach Zehnder Interferometer (MZI) based on InP Membrane on Silicon (IMOS) platform. The MZI consists of a ferromagnetic thin-film cladding and a delay line in one branch, and a polarization converter in the other. It quantitatively measures the non-reciprocal phase shift caused by the Magneto-Optic Kerr Effect in the guided mode which depends on the memory bit’s magnetization direction. The current design is an analytical tool for research exploration of all-optical magnetic memory reading. It has been shown that the device is able to read a nanoscale memory bit (400 × 50 × 12 nm) by using a Kerr rotation as small as 0.2∘, in the presence of a noise ∼10 dB in terms of signal-to-noise ratio. The device is shown to tolerate performance reductions that can arise during the fabrication.

Magneto-Optical Kerr Effect in Multiferroic Nanostructures

2006 ◽  
Vol 966 ◽  
Author(s):  
Matthew T. Corbo ◽  
Florian Straub ◽  
Haimei Zheng ◽  
Maria de la Paz Cruz ◽  
Yuri Suzuki
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Kerr Effect ◽  
Optical Signal ◽  
Optical Kerr Effect ◽  
Kerr Rotation ◽  
Film Composition ◽  
Magnetization Measurements ◽  
Magneto Optical Kerr Effect ◽  
Good Agreement

ABSTRACTWe report the study of the magneto-optical properties of composite multiferroic thin films composed of CoFe2O4 nanopillars embedded in a BiFeO3 matrix. The magneto-optical Kerr rotation and Kerr ellipticity in these films have been measured and are in good agreement with magnetization measurements. The Kerr signal has been studied as a function of film composition and nanopillar diameter confirming that the magneto-optical signal is due solely to the CoFe2O4 nanopillars.

Ab Initio Study of Electronic and Magneto-Optical Properties of InSb:Mn and InAs:Mn

2012 ◽  
Vol 190 ◽  
pp. 113-116
Author(s):  
E.T. Kulatov ◽  
A. Titov ◽  
Y.A. Uspenskii
Keyword(s):  
Optical Properties ◽  
Ground State ◽  
Kerr Effect ◽  
Energy Difference ◽  
State Distribution ◽  
Kerr Rotation ◽  
Polar Kerr Effect ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra ◽  
Good Agreement

Energy difference between the ferromagnetic and antiferromagnetic collinear orderings has been calculated for the uniform and dimer Mn-pair geometries in order to find the ground state distribution of the Mn atoms in InSb (As) hosts. We find the preference of the dimer ferromagnetic configuration of Mn dopants and an importance of optimizing the atomic site positions. The frequency-dependent optical and magneto-optical properties, namely the reflectivity, the electron energy loss spectra, on-and off-diagonal conductivity tensor and the polar Kerr effect, are calculated for comparison with available experimental data. Our calculated MO resonance in In1-xMnxSb (x=1.56%) are found to be in good agreement with corresponding experimental MO spectra. The origin of the large Kerr rotation is discussed.

Morphology and Magneto-optical Properties of Amorphous AlN Films Doped with Nickel

2011 ◽  
Vol 1290 ◽  
Author(s):  
W. M. Jadwisienczak ◽  
H. Tanaka ◽  
G. Chen ◽  
M. Kordesch ◽  
A. Khan
Keyword(s):  
Optical Properties ◽  
Kerr Effect ◽  
Fold Increase ◽  
Nano Particles ◽  
Ferromagnetic Behavior ◽  
Kerr Rotation ◽  
X Ray Scattering ◽  
Ni Content ◽  
Transmission Electron ◽  
Deposited Film

ABSTRACTStructural and magneto-optical properties of Ni-doped amorphous AlN layers (a-AlN) deposited by radio frequency (rf) sputtering on Silicon (001) substrates were investigated. The as-grown material exhibits weak ferromagnetic behavior as evidenced by the magneto-optic Kerr effect (MOKE) measurement with Kerr rotation less than 100 μrad at room temperature regardless of the Ni fraction. The samples with a Ni concentration below 10 at.% show a weak but monotonically increasing MOKE signal with post-growth annealing temperature. A hundred-fold increase in the Kerr rotation value was observed for samples with Ni content exceeding 20 at.% after thermal annealing at 450°C in nitrogen; and the Kerr rotation value abruptly decreases above that temperature. The morphology of as-grown and annealed a-AlN:Ni films were characterized by small angle x-ray scattering and transmission electron microscopy. It was found that the as-deposited film contains nano-particles of different sizes with average diameters less than 30 nm. The size distribution of nano-particles in the thermally annealed a-AlN:Ni was studied as a function of annealing time and temperature. The results correlate well with those obtained from the MOKE measurements.

Magneto-Optical Spectroscopy of RE/TM Alloys and TM/CO Multilayers

1991 ◽  
Vol 232 ◽  
Author(s):  
D. Weller ◽  
W. Rcim
Keyword(s):  
Transition Metal ◽  
Optical Spectroscopy ◽  
Kerr Effect ◽  
Near Infrared ◽  
Magnetic Transition ◽  
Metallic Multilayers ◽  
Kerr Rotation ◽  
X Ray ◽  
Order Of Magnitude ◽  
Magneto Optic

ABSTRACTThis paper reviews on magneto-optical spectroscopy of alloys, metallic multilayers and interference enhancement structures for magneto-optic (MO) recording. Mainly rare earth transition metal (RE-TM) alloys and Co/transition metal (Co/X) multilayers will be discussed. The read out performance in MO write/read tests is given by tile reflectivity and Kerr rotation strongly depends on the wavelength. While the magneto-optical transitions in the near infrared (IR:≈820nm) are dominated by tile 3d magnetic transition metals Fe and Co, the properties in the ultraviolet (UV: <400nm) can be dominated by either rare earths like Nd or Pr in RE-TM alloys or by exchange polarized Pt or Pd in Co/X multilayers and their respective alloys.In an attempt to correlate the magneto-optic Kerr effect to electronic properties we have systematically investigated alloys and multilayers with x-ray photoemission (XPS) and polar magneto-optical Kerr spectroscopy (0.5–5.3eV range). It is found that electronic 4f levels in Nd or Pr contribute to the Kerr elffct via Γ→, d transitions in the order of 0.3°. Exchange polarized Pd and Pt in Co/X multilayers give rise to a room temperature Kerr rotation in the same order of magnitude via excitations of the 4d and 5d bands, respectively. These effects clearly depend on film compositions and thickness ratios.,

Unusual Behavior in The Magnetic Anisotropy of Ultra-Thin Co Sandwiches: The Role of Au Underlayers.

1995 ◽  
Vol 384 ◽  
Author(s):  
Christian Marlière ◽  
Brad N. Engel ◽  
Charles M. Falco
Keyword(s):  
Magnetic Anisotropy ◽  
Coercive Field ◽  
Kerr Effect ◽  
Atomic Layer ◽  
Perpendicular Anisotropy ◽  
Unusual Behavior ◽  
Sharp Minimum ◽  
Polar Kerr Effect

ABSTRACTWe have used in situ polar Kerr effect measurements to study the magnetic anisotropy of X/Co/Y sandwich structures grown by MBE on Cu(111) buffers, where X and Y are variable thicknesses of Au. For fixed values of Y and in the case of an underlayer wedge, e.g. variable X value, we have found a sharp minimum in both coercive field and perpendicular anisotropy at ≈1 atomic layer of the Au underlayer. This anisotropy behavior is opposite to that of an Au overlayer deposited on a Co film, i.e. variable Y and fixed X.

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