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Stabilizing spin systems via symmetrically tailored RKKY interactions.

Jan Hermenau¹, Sascha Brinker^2,3, Marco Marciani^4,5

¹Department of Physics, Hamburg University, 20355, Hamburg, Germany.

Nature Communications

|June 14, 2019

Summary

Arrays of atomic spins show that Dzyaloshinskii-Moriya interaction destabilizes spin trimers. Highly symmetric structures enhance spin stability and lifetime in spintronic arrays.

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Area of Science:

Quantum physics
Materials science
Spintronics

Background:

Single atomic spins on substrates are key for spintronics and quantum computing.
Magnetic stability of these spins is enhanced by coupling into arrays.
Environmental symmetry increases single-atom spin stability, but coupling symmetry effects are unclear.

Purpose of the Study:

Investigate the role of magnetic coupling symmetry in atomic spin arrays.
Analyze Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction effects, including Dzyaloshinskii-Moriya (DM) and symmetric anisotropic exchange.
Determine how coupling symmetry impacts spin stability and lifetime.

Main Methods:

Theoretical study of coupled atomic spin arrays.
Analysis of RKKY interaction, DM interaction, and symmetric anisotropic exchange.
Focus on trimer structures and their interaction with nearby atoms.

Main Results:

A trimer's spin stability can be remotely detected by a neighboring atom.
DM interaction destabilizes the trimer spin state.
Additional nearby atoms induce non-local transverse anisotropy, further destabilizing the trimer.
Highly symmetric configurations quench this transverse anisotropy.

Conclusions:

Symmetry of magnetic couplings is crucial for spin stability in atomic arrays.
DM interaction and symmetric anisotropic exchange can destabilize spin states.
Achieving high symmetry in spin array structures significantly enhances spin lifetime and stability for spintronic applications.