We propose a new in situ microfabrication method using focused electron/ion beam processing to study the influence of crystal orientation on magnetotransport properties. Previous studies obtained microcrystals extracted from bulk single crystals with the out-of-plane crystallographic axis <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43579_2025_719_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">$\overrightarrow{c}$</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mi>c</mi> <mo stretchy="false">→</mo> </mover> </math></EquationSource> </InlineEquation> perpendicular to the applied magnetic field <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43579_2025_719_Article_IEq2.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">$\overrightarrow{B}$</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mi>B</mi> <mo stretchy="false">→</mo> </mover> </math></EquationSource> </InlineEquation> and parallel to the current flow. The new method orients <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43579_2025_719_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">$\overrightarrow{c}$</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mi>c</mi> <mo stretchy="false">→</mo> </mover> </math></EquationSource> </InlineEquation> parallel to <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43579_2025_719_Article_IEq2.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">$\overrightarrow{B}$</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mi>B</mi> <mo stretchy="false">→</mo> </mover> </math></EquationSource> </InlineEquation> and perpendicular to the current. Magnetotransport measurements at 2 K on Bi2Se3 samples fabricated using both methods reveal differences in zero-field resistivity and charge carrier mobility, demonstrating the impact of the crystal orientation in which the microcrystal is extracted on the electrical transport properties. Graphical Abstract

Method for extraction of microcrystals based on focused electron/ion beam processing and their magnetotransport characterization

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2025年5月2日

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Amaia Sáenz-Hernández,
Soraya Sangiao,
Geetha Balakrishnan,
José María De Teresa

摘要

We propose a new in situ microfabrication method using focused electron/ion beam processing to study the influence of crystal orientation on magnetotransport properties. Previous studies obtained microcrystals extracted from bulk single crystals with the out-of-plane crystallographic axis $\overrightarrow{c}$ $\vec{c}$ perpendicular to the applied magnetic field $\overrightarrow{B}$ $\vec{B}$ and parallel to the current flow. The new method orients $\overrightarrow{c}$ $\vec{c}$ parallel to $\overrightarrow{B}$ $\vec{B}$ and perpendicular to the current. Magnetotransport measurements at 2 K on Bi₂Se₃ samples fabricated using both methods reveal differences in zero-field resistivity and charge carrier mobility, demonstrating the impact of the crystal orientation in which the microcrystal is extracted on the electrical transport properties.

Graphical Abstract