Nb-Ti filamant onion blossom superimposed on the Frank Shaw Building, the new home of the Applied Superconductivity Center

NHMFL > ASC > Image Gallery > MO Images

ArrowMagneto Optical Image Gallery

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2.1T a a
853X887
588KB JPG		 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.

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.

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.
2.1T b

b
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71KB JPG
2.1T c c
922X647
99KB JPG
2.2T 780X761
564 JPG		 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.
2.3aT a
478X613
46KB JPG
 MO images of YBCO [001] tilt bicrystals at 3 (a), 5 (b), and 7 (c) 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.
2.3bT b
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5KB JPG
2.3cT c
477X601
48KB JPG
3.1T 917X801
240KB JPG
 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.
3.11T 1723X1334
584KB JPG
 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.
3.20G 390X713
39KB JPG		 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.


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