Element specific investigation of ultrathin Co2MnGa/GaAs heterostructures

Jill S. Claydon; Sameh Hassan; Christian Danvad Damsgaard; Jørn Bindslev Hansen; Claus Schelde Jacobsen; Yongbing B. Xu; Gerrit van der Laan

doi:10.1063/1.2712165

Element specific investigation of ultrathin Co2MnGa/GaAs heterostructures

Jill S. Claydon, Sameh Hassan, Christian Danvad Damsgaard, Jørn Bindslev Hansen, Claus Schelde Jacobsen, Yongbing B. Xu, Gerrit van der Laan

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Abstract

We have used x-ray magnetic circular dichroism to study the element specific magnetic properties of ultrathin films of the Heusler alloy Co2MnGa at room temperature. Nine films were grown by molecular beam epitaxy on GaAs substrates and engineered to vary in stoichiometry as Co1.86Mn0.99Ga1, Co1.95Mn0.98Ga1, and Co1.97Mn0.96Ga1, with thicknesses of 5.3, 7.6, and 9.7 nm, and were capped with Al to prevent oxidization. Sum rule analysis revealed magnetic moments significantly lower than the values predicted theoretically, especially in the case of the Mn total magnetic moment. The results do not support the hypothesis that a large magnetic moment is transferred from Co to Mn, and may suggest that diffusion and reacted layers at ultrathin thicknesses can effect the establishment of a full Heusler structure.

Original language	English
Journal	Journal of Applied Physics
Volume	101
Issue number	9
Pages (from-to)	09J506
ISSN	0021-8979
DOIs	https://doi.org/10.1063/1.2712165
Publication status	Published - 2007

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Copyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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title = "Element specific investigation of ultrathin Co2MnGa/GaAs heterostructures",

abstract = "We have used x-ray magnetic circular dichroism to study the element specific magnetic properties of ultrathin films of the Heusler alloy Co2MnGa at room temperature. Nine films were grown by molecular beam epitaxy on GaAs substrates and engineered to vary in stoichiometry as Co1.86Mn0.99Ga1, Co1.95Mn0.98Ga1, and Co1.97Mn0.96Ga1, with thicknesses of 5.3, 7.6, and 9.7 nm, and were capped with Al to prevent oxidization. Sum rule analysis revealed magnetic moments significantly lower than the values predicted theoretically, especially in the case of the Mn total magnetic moment. The results do not support the hypothesis that a large magnetic moment is transferred from Co to Mn, and may suggest that diffusion and reacted layers at ultrathin thicknesses can effect the establishment of a full Heusler structure.",

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note = "Copyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.",

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T1 - Element specific investigation of ultrathin Co2MnGa/GaAs heterostructures

AU - Claydon, Jill S.

AU - Hassan, Sameh

AU - Damsgaard, Christian Danvad

AU - Hansen, Jørn Bindslev

AU - Jacobsen, Claus Schelde

AU - Xu, Yongbing B.

AU - van der Laan, Gerrit

N1 - Copyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2007

Y1 - 2007

N2 - We have used x-ray magnetic circular dichroism to study the element specific magnetic properties of ultrathin films of the Heusler alloy Co2MnGa at room temperature. Nine films were grown by molecular beam epitaxy on GaAs substrates and engineered to vary in stoichiometry as Co1.86Mn0.99Ga1, Co1.95Mn0.98Ga1, and Co1.97Mn0.96Ga1, with thicknesses of 5.3, 7.6, and 9.7 nm, and were capped with Al to prevent oxidization. Sum rule analysis revealed magnetic moments significantly lower than the values predicted theoretically, especially in the case of the Mn total magnetic moment. The results do not support the hypothesis that a large magnetic moment is transferred from Co to Mn, and may suggest that diffusion and reacted layers at ultrathin thicknesses can effect the establishment of a full Heusler structure.

AB - We have used x-ray magnetic circular dichroism to study the element specific magnetic properties of ultrathin films of the Heusler alloy Co2MnGa at room temperature. Nine films were grown by molecular beam epitaxy on GaAs substrates and engineered to vary in stoichiometry as Co1.86Mn0.99Ga1, Co1.95Mn0.98Ga1, and Co1.97Mn0.96Ga1, with thicknesses of 5.3, 7.6, and 9.7 nm, and were capped with Al to prevent oxidization. Sum rule analysis revealed magnetic moments significantly lower than the values predicted theoretically, especially in the case of the Mn total magnetic moment. The results do not support the hypothesis that a large magnetic moment is transferred from Co to Mn, and may suggest that diffusion and reacted layers at ultrathin thicknesses can effect the establishment of a full Heusler structure.

U2 - 10.1063/1.2712165

DO - 10.1063/1.2712165

M3 - Journal article

SN - 0021-8979

VL - 101

SP - 09J506

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

ER -

Element specific investigation of ultrathin Co2MnGa/GaAs heterostructures

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