Free-standing GaMnAs nanomachined sheets for van der pauw magnetotransport measurements

Jae Hyun Lee; Seondo Park; Chanuk Yang; Hyung Kook Choi; Myung Rae Cho; Sung Un Cho; Yun Daniel Park

doi:10.3390/mi7120223

Free-standing GaMnAs nanomachined sheets for van der pauw magnetotransport measurements

Jae Hyun Lee
, Seondo Park
, Chanuk Yang
, Hyung Kook Choi
, Myung Rae Cho
, Sung Un Cho
, Yun Daniel Park^*

^*Corresponding author for this work

Department of Physics

Seoul National University

Research output: Contribution to journal › Journal article › peer-review

2 Scopus citations

Abstract

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 T_C ~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.

Original language	English
Article number	223
Journal	Micromachines
Volume	7
Issue number	12
DOIs	https://doi.org/10.3390/mi7120223
State	Published - 2016

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure

Keywords

Free-standing structure
Magnetic anisotropy
Magnetotranport

Quacquarelli Symonds(QS) Subject Topics

Engineering - Mechanical
Computer Science & Information Systems
Engineering - Electrical & Electronic
Engineering - Petroleum

Access to Document

10.3390/mi7120223

Cite this

@article{b013f7a44c0a411faf8110e79cbc2196,

title = "Free-standing GaMnAs nanomachined sheets for van der pauw magnetotransport measurements",

abstract = "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 \textasciitilde{}6\% Mn) microsheets (with TC \textasciitilde{}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.",

keywords = "Free-standing structure, Magnetic anisotropy, Magnetotranport",

author = "Lee, \{Jae Hyun\} and Seondo Park and Chanuk Yang and Choi, \{Hyung Kook\} and Cho, \{Myung Rae\} and Cho, \{Sung Un\} and Park, \{Yun Daniel\}",

note = "Publisher Copyright: {\textcopyright} 2016 by the authors.",

year = "2016",

doi = "10.3390/mi7120223",

language = "English",

volume = "7",

journal = "Micromachines",

issn = "2072-666X",

number = "12",

}

TY - JOUR

T1 - Free-standing GaMnAs nanomachined sheets for van der pauw magnetotransport measurements

AU - Lee, Jae Hyun

AU - Park, Seondo

AU - Yang, Chanuk

AU - Choi, Hyung Kook

AU - Cho, Myung Rae

AU - Cho, Sung Un

AU - Park, Yun Daniel

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Free-standing structure

KW - Magnetic anisotropy

KW - Magnetotranport

UR - https://www.scopus.com/pages/publications/85007289734

U2 - 10.3390/mi7120223

DO - 10.3390/mi7120223

M3 - Journal article

AN - SCOPUS:85007289734

SN - 2072-666X

VL - 7

JO - Micromachines

JF - Micromachines

IS - 12

M1 - 223

ER -

Free-standing GaMnAs nanomachined sheets for van der pauw magnetotransport measurements

Abstract

UN SDGs

Keywords

Quacquarelli Symonds(QS) Subject Topics

Access to Document

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