Spin-glass-like behavior caused by Mn-rich Mn(Ga)As nanoclusters in GaAs

C. H. Chang, T. M. Hong

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We simulate the indirect exchange interaction between Mn-rich Mn(Ga)As nanoclusters in GaAs by analytical means. In contrast to the conventional Ruderman-Kittel-Kasuya-Yosida (RKKY) formula, which considers the mediation by the carriers in the medium, we also include the contribution from those inside the clusters. Since the carrier concentration is higher in the clusters, this modification allows the RKKY oscillation to change its sign. Consequently, while the previous approach only favors ferromagnetism for this system, an antiferromagnetic coupling is in fact possible. Since the Mn-rich Mn(Ga)As nanoclusters are naturally formed and bound to have different sizes, their spin orientation is likely to be frustrated due to mixed preferences from different neighbors. We argue that this is likely the source of the spin-glass-like behavior that plagues this system. By tuning the size and narrowing its distribution, normal ferromagnetism can be restored with a Curie temperature higher than previously thought.

Original languageEnglish
Article number212106
JournalApplied Physics Letters
Issue number21
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Spin-glass-like behavior caused by Mn-rich Mn(Ga)As nanoclusters in GaAs'. Together they form a unique fingerprint.

Cite this