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Title of Journal: Appl Phys A

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Abbravation: Applied Physics A

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Springer Berlin Heidelberg

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DOI

10.1007/bf02562589

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ISSN

1432-0630

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Initial stages in the growth of 111faceted CoCr

Authors: U Lüders F Sánchez J Fontcuberta
Publish Date: 2004/06/01
Volume: 79, Issue: 1, Pages: 93-97
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Abstract

The epitaxial growth of ferrimagnetic CoCr2O4 films on MgAl2O4001 results in selforganized 111faceted pyramids and hut clusters having base dimensions that can reach above a micron in size This paper reports the morphology and structural characterization of the initial stages of film growth Three distinctive stages are identified as the growth proceeds in the initial stage the surface is homogeneous in the second one nanometric strained pyramids appear and in the third one there are relaxed pyramids and hut clusters that continue growing up to a micronic size The islands maintain the 111faceted surfaces and the spatial order along 〈110〉 directions during the process We discuss the mechanisms that are the origin of first the coherent pyramids and later the spectacular growth of part of the islands Besides illustrating the formation process of the final structures the results presented here demonstrate that arrays of strained 111faceted CoCr2O4 pyramids with nanometric dimensions can be fabricated

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