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

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

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.

Original languageEnglish
Article number013912
JournalJournal of Applied Physics
Volume110
Issue number1
DOIs
Publication statusPublished - 2011 Jul 1

Bibliographical 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.

ASJC Scopus subject areas

  • General Physics and Astronomy

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