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Investigation of weak interlayer exchange coupling in GaMnAs/GaAs superlattices with insulating nonmagnetic spacers
Department of Physics, Korea University.
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2011 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 110, no 1Article in journal (Refereed) Published
Abstract [en]

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. © 2011 American Institute of Physics.

Place, publisher, year, edition, pages
2011. Vol. 110, no 1
Keyword [en]
Antiferromagnetic alignment, Antiferromagnetic coupling, Easy axis, Ferromagnetic behaviors, GaAs, Interlayer coupling, Interlayer exchange coupling, Magnetic layers, Nonmagnetic spacer, Nonmagnetics, Polarized neutron reflectivity, Temperature dependence, Antiferroelectricity, Antiferromagnetic materials, Antiferromagnetism, Ferromagnetic materials, Ferromagnetism, Gallium alloys, Gallium arsenide, Magnetic refrigeration, Manganese, Monolayers, Semiconducting gallium, Lanthanum compounds
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-105574DOI: 10.1063/1.3609080ISI: 000292776500084OAI: diva2:574473

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QC 20130507

Available from: 2012-12-05 Created: 2012-11-22 Last updated: 2013-05-07Bibliographically approved

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