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Hexagonal ferromagnetic MnAs nanocluster formation on GaInAs/InP (111)B layers by metal-organic vapor phase epitaxy

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2 Author(s)
Hara, S. ; Research Center for Integrated Quantum Electronics (RCIQE), Hokkaido University, North 14 West 9, Sapporo 060-0814, Japan and Graduate School of Information Science and Technology, Hokkaido University, North 13 West 8, Sapporo 060-8628, Japan ; Fukui, Takashi

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The authors report the self-assembly of hexagonal MnAs nanoclusters on GaInAs (111)B surfaces by metal-organic vapor phase epitaxy. The ferromagnetic behavior of the nanoclusters dominates the magnetic response of the samples when magnetic fields are applied in a direction parallel to the wafer plane. For the magnetic fields applied in a direction perpendicular to the plane, diamagnetic characteristics are dominant. The results indicate that the c axis of the nanoclusters is perpendicular to the plane, and that their a axis is in plane. They are consistent with the results of crystallographic analysis, where the nanoclusters’ c axis is shown to be along a GaInAs [-1-1-1] direction.

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Applied Physics Letters  (Volume:89 ,  Issue: 11 )