Room temperature ferromagnetism of Ge/MnAs digital alloys

J. J. Lee; M. Y. Kim; Y. Cui; J. H. Song; A. J. Freeman; J. B. Ketterson

doi:10.1007/s10948-005-2153-9

Room temperature ferromagnetism of Ge/MnAs digital alloys

J. J. Lee^*, M. Y. Kim, Y. Cui, J. H. Song, A. J. Freeman, J. B. Ketterson

^*Corresponding author for this work

Physics and Astronomy

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

Abstract

The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge₇/(Mn _0.5As_0.5)₁ superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 μ_B) which induces only very small magnetic moments on its neighboring As or Ge atoms.

Original language	English (US)
Pages (from-to)	75-78
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	18
Issue number	1
DOIs	https://doi.org/10.1007/s10948-005-2153-9
State	Published - 2005

Keywords

Carie temperature
Ferromagnetism
Ge/MnAs digital alloys

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1007/s10948-005-2153-9

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title = "Room temperature ferromagnetism of Ge/MnAs digital alloys",

abstract = "The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge7/(Mn 0.5As0.5)1 superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 μB) which induces only very small magnetic moments on its neighboring As or Ge atoms.",

keywords = "Carie temperature, Ferromagnetism, Ge/MnAs digital alloys",

author = "Lee, {J. J.} and Kim, {M. Y.} and Y. Cui and Song, {J. H.} 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/s10948-005-2153-9",

language = "English (US)",

volume = "18",

pages = "75--78",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

publisher = "Springer New York",

number = "1",

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TY - JOUR

T1 - Room temperature ferromagnetism of Ge/MnAs digital alloys

AU - Lee, J. J.

AU - Kim, M. Y.

AU - Cui, Y.

AU - Song, J. H.

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 - The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge7/(Mn 0.5As0.5)1 superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 μB) which induces only very small magnetic moments on its neighboring As or Ge atoms.

AB - The magnetic properties of Ge/MnAs digital alloys on GaAs (001) substrates, grown by molecular beam epitaxy, were investigated using a Quantum Design SQUID magnetometer. The Ge (1 nm)/MnAs (0.15 nm) digital alloy showed ferromagnetism up to 334 K with a coercive field of 576 Oe at room temperature, as determined from temperature-dependent magnetization and hysteresis loop measurements. The ferromagnetic and antiferromagnetic phases of a Ge7/(Mn 0.5As0.5)1 superlattice, investigated using the full-potential linearized augmented plane wave (FLAPW) method yielded a ferromagnetic ground state with a high spin magnetic moment of Mn (3.45 μB) which induces only very small magnetic moments on its neighboring As or Ge atoms.

KW - Carie temperature

KW - Ferromagnetism

KW - Ge/MnAs digital alloys

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JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

IS - 1

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Room temperature ferromagnetism of Ge/MnAs digital alloys

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Keywords

ASJC Scopus subject areas

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