scholarly journals In situ electromagnet with active cooling for real-time magneto-optic Kerr effect spectroscopy

2021 ◽  
Vol 92 (2) ◽  
pp. 025105
Author(s):  
A. Brozyniak ◽  
G. Mendirek ◽  
M. Hohage ◽  
A. Navarro-Quezada ◽  
P. Zeppenfeld
Keyword(s):  
Real Time ◽  
Kerr Effect ◽  
Active Cooling ◽  
Magneto Optic

Misfit Strain Relief Beyond the Critical Thickness Using Curvature Measurements and in Situ Characterization of the Magneto-Optic Kerr Effect

1994 ◽  
Vol 356 ◽  
Author(s):  
H. E. Inglefield ◽  
G. Bochi ◽  
C. A. Ballentine ◽  
R. C. O’Handley ◽  
C. V. Thompson
Keyword(s):  
Film Thickness ◽  
Magnetic Anisotropy ◽  
Kerr Effect ◽  
Critical Thickness ◽  
Misfit Strain ◽  
Misfit Dislocations ◽  
Wafer Curvature ◽  
Curvature Measurements ◽  
Magneto Optic

AbstractEpitaxial misfit has been characterized in Ni/Cu/Si (100) as a function of Ni film thickness using wafer curvature measurements. This strain can be related to measurements of magnetic anisotropy made in the deposition system using the magneto-optic Kerr effect. Films were deposited using molecular beam epitaxy (MBE) with varying Ni epilayer thickness between 10 and 1000Å. The change in wafer curvature due to misfit strain was measured using optical interferometry and the strain was calculated using Stoney’s equation. Transmission electron microscopy was used to characterize misfit dislocations at the Ni/Cu interface. It has been determined that misfit strain can have a very strong effect on magnetic anisotropy, particularly in the regime between the critical thickness and complete misfit accommodation, where strain has been found to decrease significantly as a function of film thickness. A critical strain has been determined at which a transition in the direction of magnetization easy axis from perpendicular to the film to in the film plane occurs. This discovery allows the use of Kerr effect measurements to characterize misfit strain in situ.

Use of Magneto-Optic Kerr Effect Measurements to Study Strain and Misfit Accommodation in Thin Films of Ni/Cu (100)

1993 ◽  
Vol 308 ◽  
Author(s):  
H.E. Inglefield ◽  
C.A. Ballentine ◽  
G. Bochi ◽  
S.S. Bogomolov ◽  
R.C. O'Handley ◽  
...  
Keyword(s):  
Thin Films ◽  
Kerr Effect ◽  
Molecular Beam ◽  
Magnetic Thin Films ◽  
Fringe Analysis ◽  
High Resolution Tem ◽  
Kinetics Of ◽  
Misfit Accommodation ◽  
Magneto Optic

ABSTRACTWe have detected magnetic transitions in Ni/Cu (100) films as a function of Ni thickness through in situ measurements of the magneto-optic Kerr effect (MOKE). Crystalline quality was monitored using in situ RHEED and Auger electron spectroscopy. Films were deposited by molecular beam epitaxy on silicon wafers and cleaved sodium chloride with varying epitaxial Ni layer thicknesses between 10 and 200 A. High-resolution TEM images of these films indicate decreasing misfit dislocation spacing and decreasing strain as measured by moiré fringe analysis with increasing Ni thickness. These observations have been correlated with changes in magnetic anisotropy as measured by MOKE. MOKE, therefore, may provide a tool for in situ monitoring of the kinetics of misfit accommodation in magnetic thin films.

In Situ Rheed and Magneto-Optic Study of Ultrathin Cobalt Films on (111) Gold Substrate: Effect of a Metallic Overlayer

1993 ◽  
Vol 313 ◽  
Author(s):  
Ould-Mahfoud S ◽  
Megy R. ◽  
Bardou N. ◽  
Bartenlian B. ◽  
Beauvillain P. ◽  
...  
Keyword(s):  
Coercive Force ◽  
Magnetic Anisotropy ◽  
Kerr Effect ◽  
Effect Study ◽  
Ultrathin Film ◽  
Substrate Effect ◽  
Gold Substrate ◽  
Cobalt Films ◽  
Magneto Optic

ABSTRACTWe present a comparative in situ RHEED and Polar Magneto-optic Kerr Effect study of the first stages of the growth of a Au overlayer on top of a (111) Co ultrathin film. Drastic behaviours are evidenced on the RHEED diagram, Magnetic anisotropy and coercive force, around 1,5 ML of Au coverage.

scholarly journals MAGNETO-OPTIC PROPERTIES AND OXIDATION/REDUCTION OF ULTRATHIN MAGNETIC FILMS: FE FILMS ON Pt(111)

2017 ◽  
Vol 24 (1&2) ◽  
pp. 107-117
Author(s):  
T.-U. Nahm
Keyword(s):  
Photoelectron Spectroscopy ◽  
Kerr Effect ◽  
Magnetic Films ◽  
No Oxidation ◽  
X Ray ◽  
Post Annealing ◽  
Oxidation Reduction ◽  
Iron Oxide Films ◽  
Magneto Optic

We have investigated magneto-optic properties of ultrathin Fe films grown on Pt(111) surfaces by using the in situ surface magneto-optic Kerr effect (SMOKE) and X-ray photoelectron spectroscopy (XPS). SMOKE measurements show that the Fe layers are not ferromagnetic when the film is thinner than approximately 4.5 MLs (monolayers), but the in-plane magnetization is present for a 4.1 ML Fe film on Pt(111) annealed at 550 K. Upon post-annealing at 770 K, a 9.2 ML Fe film does not show any Kerr signal, while a 6.3 ML Fe film has the in-plane Kerr signal with increased coercivity. The oxidation and reduction of ultrathin Fe films have also been studied by using XPS. Upon an oxygen exposure of 300 Langmuir at a film temperature of 873 K, the Fe layers were mostly oxidized as Fe3O4. When the Fe films were exposed to the same amount of oxygen at room temperature, a partial oxidation as Fe3O4 was observed for a 3 ML Fe film, while there was no oxidation for a 2 ML Fe film. On heating the 873 K oxidized films, Fe3O4O was reduced to FeO, and even the decomposition was observed. Underlying reasons for these chemical changes of Fe and iron-oxide films are discussed.

In-situ X-ray diffraction studies and magneto-optic Kerr effect on RF sputtered thin films of BaTiO3 and Co, Nb co-doped BaTiO3

2016 ◽  
Vol 42 (3) ◽  
pp. 3882-3887 ◽  
Author(s):  
R. Siddheswaran ◽  
Pavol Šutta ◽  
Petr Novák ◽  
Marie Netrvalová ◽  
Aleš Hendrych ◽  
...  
Keyword(s):  
Thin Films ◽  
Kerr Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doped ◽  
Magneto Optic

scholarly journals MAGNETO-OPTIC CHARACTERIZATIONS OF SUPERLATTICES AND WEDGED SANDWICHES WITH OSCILLATORY INTERLAYER MAGNETIC COUPLING

1993 ◽  
Vol 07 (01n03) ◽  
pp. 414-418 ◽  
Author(s):  
S. D. BADER
Keyword(s):  
Kerr Effect ◽  
Magnetic Coupling ◽  
Long Period ◽  
Interlayer Magnetic Coupling ◽  
Magneto Optic

Three examples of magnetic coupling across metallic spacer layers are considered. Fe/Nb sputtered superlattices are observed to have as many as five antiferromagnetic oscillations, but a weak magnetoresistive anomaly. Epitaxial trilayers of Fe/Mo/Fe grown on Mo(100) and Co/Cu/Co grown on Cu(100) are observed to have short- and long-period oscillations, respectively. The trilayers are grown with wedged spacer layers and characterized in-situ by means of the magneto-optic Kerr effect.

scholarly journals Electrochemical cell for in situ magneto-optic Kerr effect measurements

2003 ◽  
Vol 74 (11) ◽  
pp. 4723-4727 ◽  
Author(s):  
Kristin M. Poduska ◽  
Sylvie Morin
Keyword(s):  
Kerr Effect ◽  
Electrochemical Cell ◽  
Magneto Optic

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

Flat Flexible Thin Milli-electrode Array for Real-time in situ Water Quality Monitoring in Distribution Systems

2017 ◽  
Vol 2017 (4) ◽  
pp. 5598-5617
Author(s):  
Zhiheng Xu ◽  
Wangchi Zhou ◽  
Qiuchen Dong ◽  
Yan Li ◽  
Dingyi Cai ◽  
...  
Keyword(s):  
Water Quality ◽  
Real Time ◽  
Distribution Systems ◽  
Electrode Array ◽  
Water Quality Monitoring ◽  
Quality Monitoring
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