Magnetic anisotropy of GaAs/Fe/Au core-shell nanowires grown by MBE

Tivakornsasithorn, Kritsanu; Pimpinella, R. E.; Nguyen, Vu A.T.; Liu, X.; Dobrowolska, Małgorzata; Furdyna, J. K.

doi:10.1116/1.3678203

Cited by 10 publications

(10 citation statements)

References 15 publications

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“…[2][3][4] Device concepts based on the spin rather than the charge of the electron have been introduced in the field of spintronics. Among these concepts, nanowires that combine a semiconductor and a ferromagnet in a core-shell geometry have gained a lot of interest since 2009 when they were presented for the first time [5][6][7][8][9][10]. Because of the cylindrical shape of the ferromagnet, such core-shell nanowires could allow for a magnetization along the wire and thus perpendicular to the substrate surface.…”

Section: Introductionmentioning

confidence: 99%

Real structure of lattice matched GaAs–Fe3Si core–shell nanowires

Jenichen

Hilse

Herfort

et al. 2015

Journal of Crystal Growth

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GaAs nanowires and GaAs-Fe 3 Si core-shell nanowire structures were grown by molecular-beam epitaxy on oxidized Si(111) substrates and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Ga droplets were formed on the oxide surface, and the semiconducting GaAs nanowires grew epitaxially via the vapor-liquid-solid mechanism as singlecrystals from holes in the oxide film. We observed two stages of growth of the GaAs nanowires, first the regular growth and second the residual growth after the Ga supply was finished. The magnetic Fe 3 Si shells were deposited in an As-free chamber. They completely cover the GaAs cores although they consist of small grains. High-resolution TEM micrographs depict the differently oriented grains in the Fe 3 Si shells. Selected area diffraction of electrons and XRD gave further evidence that the shells are textured and not single crystals. Facetting of the shells was observed, which lead to thickness inhomogeneities of the shells.

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Section: Introductionmentioning

confidence: 99%

Real structure of lattice matched GaAs–Fe3Si core–shell nanowires

Jenichen

Hilse

Herfort

et al. 2015

Journal of Crystal Growth

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“…Thus, the insight of ensemble measurements on the Nws themselves that were reported recently by using superconducting quantum interference device magnetometry (SQUID), small angle neutron scattering and ferromagnetic resonance techniques are quite equivocal. [1][2][3][4][5][6][7] Single Nw magnetic investigation on the other hand gives precise information about only the selected structure (one Nw shell) but thus it reflects only the information obtained from one single event of measurement (from one Nw). To draw conclusions from such measurements over all other Nws is hence quite limited.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] To fabricate SFCSNws, commonly first semiconductor Nws are fabricated by epitaxial methods such as molecular beam epitaxy or metal oxide chemical vapor deposition and are in a second growth step coated with the ferromagnetic material. Thereby the magnetic material does not necessarily stick to the Nw shells exclusively.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of GaAs-Fe3Si core-shell nanowires—A comparison of ensemble and single nanowire investigation

2017

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On the basis of semiconductor-ferromagnet GaAs-Fe3Si core-shell nanowires (Nws) we compare the facilities of magnetic Nw ensemble measurements by superconducting quantum interference device magnetometry versus investigations on single Nws by magnetic force microscopy and computational micromagnetic modeling. Where a careful analysis of ensemble measurements backed up by transmission electron microscopy gave no insights on the properties of the Nw shells, single Nw investigation turned out to be absolutely essential.

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“…[1][2][3][4][5][6][7][8] The cylindrical shape of the ferromagnet in such core/shell NWs causes a magnetization along the wire axis, i.e. perpendicular to the substrate surface.…”

Section: Introductionmentioning

confidence: 99%

Diffraction at GaAs/Fe3Si core/shell nanowires: The formation of nanofacets

et al. 2016

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GaAs/Fe 3 Si core/shell nanowire structures were fabricated by molecular-beam epitaxy on oxidized Si(111) substrates and investigated by synchrotron x-ray diffraction. The surfaces of the Fe 3 Si shells exhibit nanofacets. These facets consist of well pronounced Fe 3 Si{111} planes. Density functional theory reveals that the Si-terminated Fe 3 Si{111} surface has the lowest energy in agreement with the experimental findings. We can analyze the x-ray diffuse scattering and diffraction of the ensemble of nanowires avoiding the signal of the substrate and poly-crystalline films located between the wires. Fe 3 Si nanofacets cause streaks in the x-ray reciprocal space map rotated by an azimuthal angle of 30 • compared with those of bare GaAs nanowires. In the corresponding TEM micrograph the facets are revealed only if the incident electron beam is oriented along [110] in accordance with the x-ray results. Additional maxima in the x-ray scans indicate the onset of chemical reactions between Fe 3 Si shells and GaAs cores occurring at increased growth temperatures.

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Magnetic anisotropy of GaAs/Fe/Au core-shell nanowires grown by MBE

Cited by 10 publications

References 15 publications

Real structure of lattice matched GaAs–Fe3Si core–shell nanowires

Real structure of lattice matched GaAs–Fe3Si core–shell nanowires

Magnetic properties of GaAs-Fe3Si core-shell nanowires—A comparison of ensemble and single nanowire investigation

Diffraction at GaAs/Fe3Si core/shell nanowires: The formation of nanofacets

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