Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers

Jae Ho Chung; Young Sang Song; Taehee Yoo; Sun Jae Chung; Sanghoon Lee; B. J. Kirby; X. Liu; J. K. Furdyna

doi:10.1063/1.3609080

Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers

Jae Ho Chung, Young Sang Song, Taehee Yoo, Sun Jae Chung, Sanghoon Lee, B. J. Kirby, X. Liu, J. K. Furdyna

Department of Physics

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

14 Citations (Scopus)

Abstract

A robust long-range antiferromagnetic coupling between ferromagnetic Ga_0.97Mn_0.03As layers has previously been realized via insertion of nonmagnetic Be-doped GaAs spacers between the magnetic layers. In this paper we report the observation of weak antiferromagnetic coupling between Ga_0.97Mn_0.03As layers through undoped GaAs spacers with thicknesses as large as 25 monolayers. The field and the temperature dependences of the sample magnetization suggest that the interlayer coupling in these systems substantially deviates from typical ferromagnetic behavior. Polarized neutron reflectivity measurements reveal antiferromagnetic alignment between Ga_0.97Mn_0.03As layers when a weak field is applied perpendicular to the magnetic easy axis during cooling below T_C. The strength of the observed coupling between the magnetic layers is estimated to be weaker than 0.05 mT.

Original language	English
Article number	013912
Journal	Journal of Applied Physics
Volume	110
Issue number	1
DOIs	https://doi.org/10.1063/1.3609080
Publication status	Published - 2011 Jul 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3609080

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@article{2eaf8bae00a345cd9d80778d52d4695f,

title = "Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers",

abstract = "A robust long-range antiferromagnetic coupling between ferromagnetic Ga0.97Mn0.03As layers has previously been realized via insertion of nonmagnetic Be-doped GaAs spacers between the magnetic layers. In this paper we report the observation of weak antiferromagnetic coupling between Ga0.97Mn0.03As layers through undoped GaAs spacers with thicknesses as large as 25 monolayers. The field and the temperature dependences of the sample magnetization suggest that the interlayer coupling in these systems substantially deviates from typical ferromagnetic behavior. Polarized neutron reflectivity measurements reveal antiferromagnetic alignment between Ga0.97Mn0.03As layers when a weak field is applied perpendicular to the magnetic easy axis during cooling below TC. The strength of the observed coupling between the magnetic layers is estimated to be weaker than 0.05 mT.",

author = "Chung, {Jae Ho} and Song, {Young Sang} and Taehee Yoo and Chung, {Sun Jae} and Sanghoon Lee and Kirby, {B. J.} and X. Liu and Furdyna, {J. K.}",

note = "Funding Information: We are grateful to Julie Borchers for technical support during polarized neutron reflectivity measurements and helpful discussions. This work is supported by the Mid-Career Research Program (Grant Nos. 2010-0025880 and 2009-0085028), and the Nuclear R&D Program (Grnat No. 2010-0018369) through the NSF grant funded by the Ministry of Education, Science, and Technology. The work at Notre Dame was supported by the National Science Foundation Grant No. DMR 10-05851.",

year = "2011",

month = jul,

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doi = "10.1063/1.3609080",

language = "English",

volume = "110",

journal = "Journal of Applied Physics",

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T1 - Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers

AU - Chung, Jae Ho

AU - Song, Young Sang

AU - Yoo, Taehee

AU - Chung, Sun Jae

AU - Lee, Sanghoon

AU - Kirby, B. J.

AU - Liu, X.

AU - Furdyna, J. K.

N1 - Funding Information: We are grateful to Julie Borchers for technical support during polarized neutron reflectivity measurements and helpful discussions. This work is supported by the Mid-Career Research Program (Grant Nos. 2010-0025880 and 2009-0085028), and the Nuclear R&D Program (Grnat No. 2010-0018369) through the NSF grant funded by the Ministry of Education, Science, and Technology. The work at Notre Dame was supported by the National Science Foundation Grant No. DMR 10-05851.

PY - 2011/7/1

Y1 - 2011/7/1

N2 - A robust long-range antiferromagnetic coupling between ferromagnetic Ga0.97Mn0.03As layers has previously been realized via insertion of nonmagnetic Be-doped GaAs spacers between the magnetic layers. In this paper we report the observation of weak antiferromagnetic coupling between Ga0.97Mn0.03As layers through undoped GaAs spacers with thicknesses as large as 25 monolayers. The field and the temperature dependences of the sample magnetization suggest that the interlayer coupling in these systems substantially deviates from typical ferromagnetic behavior. Polarized neutron reflectivity measurements reveal antiferromagnetic alignment between Ga0.97Mn0.03As layers when a weak field is applied perpendicular to the magnetic easy axis during cooling below TC. The strength of the observed coupling between the magnetic layers is estimated to be weaker than 0.05 mT.

AB - A robust long-range antiferromagnetic coupling between ferromagnetic Ga0.97Mn0.03As layers has previously been realized via insertion of nonmagnetic Be-doped GaAs spacers between the magnetic layers. In this paper we report the observation of weak antiferromagnetic coupling between Ga0.97Mn0.03As layers through undoped GaAs spacers with thicknesses as large as 25 monolayers. The field and the temperature dependences of the sample magnetization suggest that the interlayer coupling in these systems substantially deviates from typical ferromagnetic behavior. Polarized neutron reflectivity measurements reveal antiferromagnetic alignment between Ga0.97Mn0.03As layers when a weak field is applied perpendicular to the magnetic easy axis during cooling below TC. The strength of the observed coupling between the magnetic layers is estimated to be weaker than 0.05 mT.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers

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