Anomalous magnetotransport properties of epitaxial full Heusler alloys

M. S. Lund; J. W. Dong; J. Lu; X. Y. Dong; C. J. Palmstrøm; C. Leighton

doi:10.1063/1.1489081

Anomalous magnetotransport properties of epitaxial full Heusler alloys

M. S. Lund, J. W. Dong, J. Lu, X. Y. Dong, C. J. Palmstrøm, C. Leighton

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article

75 Scopus citations

Abstract

We report the magnetotransport properties of epitaxial films of the full Heusler alloys Ni₂MnGa, Ni₂MnGe, and Ni₂MnAl, grown by molecular beam epitaxy on (001) GaAs. The ferromagnetic alloys (Ni ₂MnGa,Ni₂MnGe) exhibit an anomalous temperature dependence of the resistivity and a negative magnetoresistance peaking near the Curie temperature due to spin disorder scattering. Considering the absolute values of the resistivity, the anomalous high temperature behavior and an upturn in the resistivity below 20 K, we suggest that these Heusler alloys rather than being conventional metals are in fact strongly disordered electronic systems.

Original language	English (US)
Pages (from-to)	4798-4800
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	25
DOIs	https://doi.org/10.1063/1.1489081
State	Published - Jun 24 2002

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Lund, M. S., Dong, J. W., Lu, J., Dong, X. Y., Palmstrøm, C. J., & Leighton, C. (2002). Anomalous magnetotransport properties of epitaxial full Heusler alloys. Applied Physics Letters, 80(25), 4798-4800. https://doi.org/10.1063/1.1489081

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abstract = "We report the magnetotransport properties of epitaxial films of the full Heusler alloys Ni2MnGa, Ni2MnGe, and Ni2MnAl, grown by molecular beam epitaxy on (001) GaAs. The ferromagnetic alloys (Ni 2MnGa,Ni2MnGe) exhibit an anomalous temperature dependence of the resistivity and a negative magnetoresistance peaking near the Curie temperature due to spin disorder scattering. Considering the absolute values of the resistivity, the anomalous high temperature behavior and an upturn in the resistivity below 20 K, we suggest that these Heusler alloys rather than being conventional metals are in fact strongly disordered electronic systems.",

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AU - Lund, M. S.

AU - Dong, J. W.

AU - Lu, J.

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AU - Palmstrøm, C. J.

AU - Leighton, C.

PY - 2002/6/24

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N2 - We report the magnetotransport properties of epitaxial films of the full Heusler alloys Ni2MnGa, Ni2MnGe, and Ni2MnAl, grown by molecular beam epitaxy on (001) GaAs. The ferromagnetic alloys (Ni 2MnGa,Ni2MnGe) exhibit an anomalous temperature dependence of the resistivity and a negative magnetoresistance peaking near the Curie temperature due to spin disorder scattering. Considering the absolute values of the resistivity, the anomalous high temperature behavior and an upturn in the resistivity below 20 K, we suggest that these Heusler alloys rather than being conventional metals are in fact strongly disordered electronic systems.

AB - We report the magnetotransport properties of epitaxial films of the full Heusler alloys Ni2MnGa, Ni2MnGe, and Ni2MnAl, grown by molecular beam epitaxy on (001) GaAs. The ferromagnetic alloys (Ni 2MnGa,Ni2MnGe) exhibit an anomalous temperature dependence of the resistivity and a negative magnetoresistance peaking near the Curie temperature due to spin disorder scattering. Considering the absolute values of the resistivity, the anomalous high temperature behavior and an upturn in the resistivity below 20 K, we suggest that these Heusler alloys rather than being conventional metals are in fact strongly disordered electronic systems.

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