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Nanostructure of giant magnetoresistive oxide film $Nd_{2/3}Sr_{1/3}MnO_3$ by scanning tunneling microscopy

Ramaswamy, Geetha and Raychaudhuri, AK (1996) Nanostructure of giant magnetoresistive oxide film $Nd_{2/3}Sr_{1/3}MnO_3$ by scanning tunneling microscopy. In: Journal of Applied Physics, 80 (8). pp. 4519-4522.

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Scanning tunneling microscopy was used to study the surface nanostructure of the epitaxial film $Nd_{2/3}Sr_{1/3}MnO_3$ that shows giant magnetoresistance. The surface morphology of the film consists of a number of overlapping platelets of about 30–35 \AA diameter that grow at an angle of 35°–45° to the surface normal. The peak to peak height of the platelets are multiples of the c-axis lattice parameter of 7.85 \AA showing that the growth of the platelets takes place by the layer by layer addition of one formula unit. The mean surface roughness is about 10 \AA. In the range of a few microns the film exhibits no defects or dislocations. The film is unstable in ambient atmosphere and tends to get covered by an adsorbate layer. Tip-surface interactions cause the adsorbate to be dislodged exposing the surface nanostructure. The degradation of the film in real time when imaged in air was recorded. The adsorbates increase the surface roughness of the film.

Item Type: Journal Article
Publication: Journal of Applied Physics
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Feb 2007
Last Modified: 19 Sep 2010 04:34
URI: http://eprints.iisc.ac.in/id/eprint/9406

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