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Open AccessFeature PaperArticle

Free-Standing GaMnAs Nanomachined Sheets for van der Pauw Magnetotransport Measurements

Department of Physics & Astronomy and Institute of Applied Physics, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
Department of Physics, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Korea
Author to whom correspondence should be addressed.
Academic Editors: Taejoon Kouh and Nam-Trung Nguyen
Micromachines 2016, 7(12), 223;
Received: 24 October 2016 / Revised: 29 November 2016 / Accepted: 5 December 2016 / Published: 9 December 2016
(This article belongs to the Special Issue Mechanical Systems Approaching Nanoscales and Beyond)
We report on the realization of free-standing GaMnAs epilayer sheets using nanomachining techniques. By optimizing the growth conditions of the sacrificial Al0.75Ga0.25As layer, free-standing metallic GaMnAs (with ~6% Mn) microsheets (with TC ~85 K) with integrated electrical probes are realized for magnetotransport measurements in the van der Pauw geometry. GaMnAs epilayer needs to be physically isolated to avoid buckling effects stemming from the release of lattice mismatch strain during the removal of the AlGaAs sacrificial layer. From finite element analysis, symmetrically placed and serpentine-shaped electrical leads induce minimal thermal stress at low temperatures. From magnetotransport measurements, changes in magnetic anisotropy are readily observed. View Full-Text
Keywords: free-standing structure; magnetotranport; magnetic anisotropy free-standing structure; magnetotranport; magnetic anisotropy
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MDPI and ACS Style

Lee, J.-H.; Park, S.; Yang, C.; Choi, H.K.; Cho, M.R.; Cho, S.U.; Park, Y.D. Free-Standing GaMnAs Nanomachined Sheets for van der Pauw Magnetotransport Measurements. Micromachines 2016, 7, 223.

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