SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC AND SUPERCONDUCTING NANO ARRAYS D. Kumar, North Carolina A

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SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC
AND SUPERCONDUCTING NANO ARRAYSD. Kumar, North
Carolina A T State University, DMR-0403480
By maneuvering the misfit strain between
nanoparticles and the surrounding thin film
matrix, self-assembled ordered structures of
nanomagnetic particles in nonmagnetic thin film
matrices and nanodimensional impurity defects
-acting as pinning centers- in a high temperature
superconducting YBa2Cu3O7-x thin film matrix have
been achieved using a pulsed laser deposition
technique, shown schematically in adjacent
figure. The abilities to create an ordered array
of magnetic nanoparticles in thin film matrix and
to embed coherent array of non-reactive
nanoparticles in superconducting thin film matrix
are expected to result in the fabrication of new
devices in the area of magnetic recording,
biomedicine, and the development of
second-generation coated conductor films for
power applications.
(a) 3-D self-assembled Ni-nanoparticles in Al2O3
thin film matrix. (b) STEM-image of a single
Ni-nanoparticle obtained using the STEM at ORNL
with highest resolution in the world.
(a) Cross-section high-resolution STEM-image of
YBCO film embedded with Y2O3 nanoparticles
(indicated by arrows) are clearly discernible,
with average size and separation of 5 nm and 10
nm, respectively (b) High resolution STEM image
of one Y2O3 nanoparticle showing its coherent
growth in the YBCO matrix.
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SCIENCE AND TECHNOLOGY OF SELF-ASSEMBLED MAGNETIC
AND SUPERCONDUCTING NANO ARRAYSD. Kumar, North
Carolina A T State University, DMR-0403480
Broader Impact New Course Development The
course (MEEN 660 New Methods in Thin Film
Synthesis) was taken by eight MS and four senior
undergraduate students. The course is planned to
be inducted in permanent course-curricula of
Mech. Eng. Dept. at NCAT. Infrastructure
development A physical property measurement
system has been purchased which is used by
several faculty and students members at NCAT
enhancing their research and educational standard
significantly. Salient Publications (total
exceeds 15) J. Mater. Res. (Invited, 2005), Meta.
Mate.Trans. 36A, 277-294 (2005), J. Appl. Phys.
97 (2005), J. Nanosci. Nanotechno. 4, 726 (2004),
Supercond. Sci. Tech. (submitted) Invited
presentation (more than 10) Kumar (2 MRS TMS),
Hebard (2 APS MRS)), Pennycook (1 MRS),
Narayan (4 MRS, TMS Campbell Lecture), Gapud
(1MRS) International dissemination of
results NIRT-PI was the lead organizer of a
symposium on Magnetic nanoparticles and
nanowires during MRS 2005 Spring Meeting in San
Francisco that had 15 invited oral
presentations, 50 contributed oral presentations,
and 30 poster presentations from within and
outside USA.