Observation of Microstructural Evolutions of Epitaxial Fe/MgO Layers Grown on InxGa1-xAs Substrates

Title
Observation of Microstructural Evolutions of Epitaxial Fe/MgO Layers Grown on InxGa1-xAs Substrates
Authors
김경호김형준안재평신일재장준연
Issue Date
2010-08
Publisher
IEEE NANO 2010 Joint Symposium with NANO KOREA
Abstract
The micostructural evolutions of epitaxial Fe/MgO layers on InxGa1-xAs substrates have been investigated with respect to indium content, x and the growth temperature of MgO interlayer. Keeping the in-plane epitaxial relationship of Fe[010]//MgO[1-10]//InxGa1-xAs[1-10] in the structures of all x values, the crystal structure and morphology of the Fe/MgO layers considerably change with the x value and the MgO growth temperature. 4nm thick MgO layers grow in two-dimensional layer regardless of the x value and the growth temperature in spite of relatively large lattice mismatch to the substrates. In clear contrast, the morphology of subsequent Fe alters from two-dimensional layer to three-dimensional islands with the x value. The higher x values give rise to the larger misfit strain within MgO layers, leading to the Fe island formation. The higher MgO growth temperatures accelerate the partial strain relaxation of the MgO layers, resulting in the suppression of the Fe island formation.
URI
http://pubs.kist.re.kr/handle/201004/37849
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