Ferromagnetism of Mn/Ge multilayers grown by molecular beam epitaxy

J. J. Lee; J. E. Medvedeva; J. H. Song; Y. Cui; A. J. Freeman; J. B. Ketterson

doi:10.1007/S10948-005-0005-2

Ferromagnetism of Mn/Ge multilayers grown by molecular beam epitaxy

J. J. Lee^*, J. E. Medvedeva, J. H. Song, Y. Cui, A. J. Freeman, J. B. Ketterson

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We report on novel ferromagnetic Mn/Ge multilayers for spintronics applications investigated both experimentally and theoretically. Two Mn/Ge multilayers are grown on GaAs (001) substrates by molecular beam epitaxy. The period of each multilayer consists of an Mn layer of varying thickness (0.6 and 5 Å) and a 10 Å thick Ge spacer layer. From temperaturedependent magnetization and hysteresis loop measurements, the Mn (0.6 Å)/Ge (10 Å) multilayer showed very weak ferromagnetic ordering, which is persistent up to 260 K, whereas the Mn (5 Å)/Ge (10 Å) multilayer exhibited strong ferromagnetism up to 305 K. The coercive field of the Mn (5 Å)/Ge (10 Å) multilayer was 277 Oe at 200 K. Density functional electronic band structure calculations on a number of Mn/Ge (001) multilayers determined them to be ferromagnetic, and estimates of their critical temperatures are reported.

Original language	English (US)
Pages (from-to)	335-338
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	18
Issue number	3
DOIs	https://doi.org/10.1007/S10948-005-0005-2
State	Published - 2005

Funding

Research at Northwestern University was supported by the AFOSR Chalcopyrite MURI Grant # F49620-01-1-0428, DARPA Grant # N00014-02-1-0887, and NSF Grant # ECS-0224210; use was made of the facilities operated by the Northwestern Materials Research Center supported by the National Science Foundation.

Keywords

Ferromagnetism
MBE
Mn/Ge multilayers

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1007/S10948-005-0005-2

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title = "Ferromagnetism of Mn/Ge multilayers grown by molecular beam epitaxy",

abstract = "We report on novel ferromagnetic Mn/Ge multilayers for spintronics applications investigated both experimentally and theoretically. Two Mn/Ge multilayers are grown on GaAs (001) substrates by molecular beam epitaxy. The period of each multilayer consists of an Mn layer of varying thickness (0.6 and 5 {\AA}) and a 10 {\AA} thick Ge spacer layer. From temperaturedependent magnetization and hysteresis loop measurements, the Mn (0.6 {\AA})/Ge (10 {\AA}) multilayer showed very weak ferromagnetic ordering, which is persistent up to 260 K, whereas the Mn (5 {\AA})/Ge (10 {\AA}) multilayer exhibited strong ferromagnetism up to 305 K. The coercive field of the Mn (5 {\AA})/Ge (10 {\AA}) multilayer was 277 Oe at 200 K. Density functional electronic band structure calculations on a number of Mn/Ge (001) multilayers determined them to be ferromagnetic, and estimates of their critical temperatures are reported.",

keywords = "Ferromagnetism, MBE, Mn/Ge multilayers",

author = "Lee, {J. J.} and Medvedeva, {J. E.} and Song, {J. H.} and Y. Cui and Freeman, {A. J.} and Ketterson, {J. B.}",

note = "Funding Information: Research at Northwestern University was supported by the AFOSR Chalcopyrite MURI Grant # F49620-01-1-0428, DARPA Grant # N00014-02-1-0887, and NSF Grant # ECS-0224210; use was made of the facilities operated by the Northwestern Materials Research Center supported by the National Science Foundation.",

year = "2005",

doi = "10.1007/S10948-005-0005-2",

language = "English (US)",

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pages = "335--338",

journal = "Journal of Superconductivity and Novel Magnetism",

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AU - Lee, J. J.

AU - Medvedeva, J. E.

AU - Song, J. H.

AU - Cui, Y.

AU - Freeman, A. J.

AU - Ketterson, J. B.

N1 - Funding Information: Research at Northwestern University was supported by the AFOSR Chalcopyrite MURI Grant # F49620-01-1-0428, DARPA Grant # N00014-02-1-0887, and NSF Grant # ECS-0224210; use was made of the facilities operated by the Northwestern Materials Research Center supported by the National Science Foundation.

PY - 2005

Y1 - 2005

N2 - We report on novel ferromagnetic Mn/Ge multilayers for spintronics applications investigated both experimentally and theoretically. Two Mn/Ge multilayers are grown on GaAs (001) substrates by molecular beam epitaxy. The period of each multilayer consists of an Mn layer of varying thickness (0.6 and 5 Å) and a 10 Å thick Ge spacer layer. From temperaturedependent magnetization and hysteresis loop measurements, the Mn (0.6 Å)/Ge (10 Å) multilayer showed very weak ferromagnetic ordering, which is persistent up to 260 K, whereas the Mn (5 Å)/Ge (10 Å) multilayer exhibited strong ferromagnetism up to 305 K. The coercive field of the Mn (5 Å)/Ge (10 Å) multilayer was 277 Oe at 200 K. Density functional electronic band structure calculations on a number of Mn/Ge (001) multilayers determined them to be ferromagnetic, and estimates of their critical temperatures are reported.

AB - We report on novel ferromagnetic Mn/Ge multilayers for spintronics applications investigated both experimentally and theoretically. Two Mn/Ge multilayers are grown on GaAs (001) substrates by molecular beam epitaxy. The period of each multilayer consists of an Mn layer of varying thickness (0.6 and 5 Å) and a 10 Å thick Ge spacer layer. From temperaturedependent magnetization and hysteresis loop measurements, the Mn (0.6 Å)/Ge (10 Å) multilayer showed very weak ferromagnetic ordering, which is persistent up to 260 K, whereas the Mn (5 Å)/Ge (10 Å) multilayer exhibited strong ferromagnetism up to 305 K. The coercive field of the Mn (5 Å)/Ge (10 Å) multilayer was 277 Oe at 200 K. Density functional electronic band structure calculations on a number of Mn/Ge (001) multilayers determined them to be ferromagnetic, and estimates of their critical temperatures are reported.

KW - Ferromagnetism

KW - MBE

KW - Mn/Ge multilayers

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Ferromagnetism of Mn/Ge multilayers grown by molecular beam epitaxy

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