Noncollinear magnetic configurations and substrate-mediated interactions in Mn trimers on the GaN (000$$\bar{1}$$) surface
Abstract
Collinear and noncollinear calculations based on density functional theory are carried out to elucidate the magnetic ordering of Mn trimers on a GaN ($$000\bar{1}$$) substrate. These trimers had previously been observed in $$3a \times 3a$$ surface reconstructions through Mn deposition onto the N-polar face of wurtzite GaN($$000\bar{1}$$). In this work, we start off by studying the effect of spin orbit coupling for the case of monomers and dimers of Mn atoms on top of a GaN surface. Based on an effective spin Hamiltonian, we estimate the magnetic anisotropy energy (MAE) for those cases and found that it is four orders of magnitude weaker than the exchange magnetic coupling between Mn adatoms. In the Mn trimer case, the magnetic ground state has the Mn spins in-plane with the GaN surface in which the relative spin orientation within each trimer is noncollinear due to the competition between the two antiferromagnetic interactions that affect each Mn spin in the trimer, which leads to the found energy minimum with 120 degree angles between the spins. By exploring the nature and fundamental mechanisms for the magnetic interaction among the Mn trimers, we find that the surface states of the substrate play a key role, involving a Ruderman-Kittel-Kasuya-Yosida (RKKY)-type interaction. We report on an electron-mediated long-distance exchange coupling between localized magnetic moments on a GaN($$000\bar{1}$$) surface.
- Authors:
-
[1];
[1];
[2];
[1]
- National Atomic Energy Commission (CNEA), Buenos Aires (Argentina)
- Ohio Univ., Athens, OH (United States)
- Publication Date:
- Research Org.:
- Ohio Univ., Athens, OH (United States)
- Sponsoring Org.:
- National Scientific and Technical Research Council (CONICET); Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1849702
- Grant/Contract Number:
- FG02-06ER46317
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 9; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics
Citation Formats
Hunt, Diego, Barral, María Andrea, Smith, Arthur R., and Ferrari, Valeria. Noncollinear magnetic configurations and substrate-mediated interactions in Mn trimers on the GaN (000$\bar{1}$) surface. United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.094418.
Hunt, Diego, Barral, María Andrea, Smith, Arthur R., & Ferrari, Valeria. Noncollinear magnetic configurations and substrate-mediated interactions in Mn trimers on the GaN (000$\bar{1}$) surface. United States. https://doi.org/10.1103/physrevb.103.094418
Hunt, Diego, Barral, María Andrea, Smith, Arthur R., and Ferrari, Valeria. Fri .
"Noncollinear magnetic configurations and substrate-mediated interactions in Mn trimers on the GaN (000$\bar{1}$) surface". United States. https://doi.org/10.1103/physrevb.103.094418. https://www.osti.gov/servlets/purl/1849702.
@article{osti_1849702,
title = {Noncollinear magnetic configurations and substrate-mediated interactions in Mn trimers on the GaN (000$\bar{1}$) surface},
author = {Hunt, Diego and Barral, María Andrea and Smith, Arthur R. and Ferrari, Valeria},
abstractNote = {Collinear and noncollinear calculations based on density functional theory are carried out to elucidate the magnetic ordering of Mn trimers on a GaN ($000\bar{1}$) substrate. These trimers had previously been observed in $3a \times 3a$ surface reconstructions through Mn deposition onto the N-polar face of wurtzite GaN($000\bar{1}$). In this work, we start off by studying the effect of spin orbit coupling for the case of monomers and dimers of Mn atoms on top of a GaN surface. Based on an effective spin Hamiltonian, we estimate the magnetic anisotropy energy (MAE) for those cases and found that it is four orders of magnitude weaker than the exchange magnetic coupling between Mn adatoms. In the Mn trimer case, the magnetic ground state has the Mn spins in-plane with the GaN surface in which the relative spin orientation within each trimer is noncollinear due to the competition between the two antiferromagnetic interactions that affect each Mn spin in the trimer, which leads to the found energy minimum with 120 degree angles between the spins. By exploring the nature and fundamental mechanisms for the magnetic interaction among the Mn trimers, we find that the surface states of the substrate play a key role, involving a Ruderman-Kittel-Kasuya-Yosida (RKKY)-type interaction. We report on an electron-mediated long-distance exchange coupling between localized magnetic moments on a GaN($000\bar{1}$) surface.},
doi = {10.1103/physrevb.103.094418},
journal = {Physical Review. B},
number = 9,
volume = 103,
place = {United States},
year = {Fri Mar 12 00:00:00 EST 2021},
month = {Fri Mar 12 00:00:00 EST 2021}
}
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