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Magneto Optical (MO) Image Gallery

Schematic

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in the absence of a field to 40 K 853x887
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Magneto-optical (MO) image of a 3.3 mm wide YBCO on RABiTS coated conductor.
A- Sample was cooled in the absence of a field to 40 K, and then a field of 60 mT was applied.
A close up of the granular nature of the magnetic field 300x297
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Magneto-optical (MO) image of a 3.3 mm wide YBCO on RABiTS coated conductor.
B- A close up of the granular nature of the magnetic field. The field penetrates preferentially along grain boundaries in the YBCO. These grain boundaries are replicated from the RABiTS substrate.
A flux profile across the image in a) at the location marked by the arrows 922x647
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Magneto-optical (MO) image of a 3.3 mm wide YBCO on RABiTS coated conductor.
C- A flux profile across the image in A at the location marked by the arrows. In red a profile for a perfectly uniform single crystal has been superimposed.
MO and light microscope (LM) images of a deformation textured coated conductor. 780x761
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MO and light microscope (LM) images of a deformation textured coated conductor.
A- MO image. Sample was cooled in the presence of a 60 mT field to 40 K, and then the field was removed.
B- LM image of the surface of the YBCO.
C- LM image of the surface of the underlying Ni substrate. YBCO and buffer layers have been removed.
D- Superposition of A and C showing that substrate grain boundaries directly effect current flow int he YBCO.
MO images of YBCO [001] tilt bicrystals at 3 degrees 478x613
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MO images of YBCO [001] tilt bicrystals at 3 degrees. The brightness of the grain boundary depends not only on the Jc of the grain boundary, but on the Jc of the intra-grain as well.
MO images of YBCO [001] tilt bicrystals at 5 degrees 79x100
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MO images of YBCO [001] tilt bicrystals at 5 degrees. The brightness of the grain boundary depends not only on the Jc of the grain boundary, but on the Jc of the intra-grain as well.
MO images of YBCO [001] tilt bicrystals at 7 degrees 477x610
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MO images of YBCO [001] tilt bicrystals at 7 degrees. The brightness of the grain boundary depends not only on the Jc of the grain boundary, but on the Jc of the intra-grain as well.
Schematic showing two possible imaging regimes 917x801
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Schematic showing two possible imaging regimes. A,B Zero field coolde (ZFC) regime. The sample is cooled below Tc in the absence of a magnetic field, and then a field is applied. c,d) Field cooled (FC) regime. The sample is cooled below Tc in the presence of a field, and then the field is removed.
MO images of YBCO on RABiTS 1723x1334
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MO images of YBCO on RABiTS. A laser scribed link can be seen in the images with dimensions of ~0.5 x 1 mm. a) MO image of the sample under an applied transport current of 1.0 A, equal to Ic. Notice only portion of the GBs are visible in the link;, highlighting the location of dissipation. b) A zero field cooled (ZFC) image of the link, showing more of the GBs in the link.
MO image of YBCO on a deformation textured substrate 390x713
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MO image of YBCO on a deformation textured substrate. A laser scribed link can be seen in the images with dimensions of ~0.4 x 1.1 mm. This image is an image of the self field of the link at an applied current of 2.4 A, equal to Ic.
MO images of the self field of YBCO on RABiTS 851x1293
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MO images of the self field of YBCO on RABiTS. A laser scribed link can be seen in the images with dimensions of ~0.5 x 1 mm.
A- MO image of the link at I = 0.5 Ic, well before the onset of dissipation.
MO images of the self field of YBCO on RABiTS 851x1293
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MO images of the self field of YBCO on RABiTS. A laser scribed link can be seen in the images with dimensions of ~0.5 x 1 mm.
B- I = Ic, and
MO images of the self field of YBCO on RABiTS 851x1293
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MO images of the self field of YBCO on RABiTS. A laser scribed link can be seen in the images with dimensions of ~0.5 x 1 mm.
C- I = 1.5 Ic, a highly dissipative state. The transition from A to C with increasing applied current is extremely gradual.
MO images of the self field of YBCO on RABiTSmagneto_scribed_link 2242x1905
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Yet another laser scribed link in a YBCO on RABiTS sample.. The link is ~300 ┬Ám wide. Images are shown for an increasing applied currents. Ic = 560 mA. The only difference between E and F is a rotation of the polarizer in the MO microscope, demonstrating that the colors are relative.
MO image of a credit card 640x480
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MO image of a credit card.
A-The indicator film is sitting on top of the magnet strip on the back of a credit card, underneath a microscope objective.
MO image of a credit card 640x480
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MO image of a credit card.
B-a MO image of the magnetic pattern on the back of a credit card, taken using the setup in A.
YBCO on single crystal LAO, cut into strips with a laser. 1080x1520
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YBCO on single crystal LAO, cut into strips with a laser.
Schematic of Mo image under an applied magnetic field. 394x237
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Schematic of Mo image under an applied magnetic field.
A- An applied field induces currents to flow in the sample.
Schematic of Mo image under an applied magnetic field. 394x237
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Schematic of Mo image under an applied magnetic field.
B-Sample with indictor film placed on top. The intensity (brightness) of the MO image reflects the magnitude of the local magnetic field. The indicator film produces an intensity map on the Bz component of the magnetic field in a plane just above the surface of the sample.
Schematic of Mo image under an applied magnetic field. 375x222
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Schematic of Mo image under an applied magnetic field.
C-a 3D plot of the Bz component of the magneti field imaged in B.
Schematic of MO imaging under an applied transport current 432x298
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Schematic of MO imaging under an applied transport current.
A-a An applied transport current (black arrows) in a superconducting sample (green) produces a magnetic field which wraps around the sample (purple arrows).
Schematic of MO imaging under an applied transport current 432x298
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Schematic of MO imaging under an applied transport current.
B-When the MO indicator film is placed on top of the sample, only the Bz component of the magnetic field is seen. Here the indicator film images the Bz component of the magnetic field in a plane just above the surface of the sample.
Schematic of MO imaging under an applied transport current 462x272
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Schematic of MO imaging under an applied transport current.
C-a 3D plot of the Bz component of the magnetic field in the plane of the indicator film in b). Not the different colors in the MO image correspond to different direction of magnetic field.
MO image of YBCO on a deformation textured substrate 1080x1520
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MO image of YBCO on a deformation textured substrate. The influence of the granular substrate can clearly be seen. For this image the sample was cooled to 77 K in the absence of a magnetic field, and then a field of 60 mT was applied.
Last modified on 17 June 2015