Quasiantiferromagnetic 120° Néel state in two-dimensional clusters of dipole-quadrupole-interacting particles on a hexagonal lattice

Mikuszeit, Nikolai; Baraban, Larysa; Vedmedenko, Elena Y.; Erbe, Artur; Leiderer, Paul; Wiesendanger, Roland

Quasiantiferromagnetic 120° Néel state in two-dimensional clusters of dipole-quadrupole-interacting particles on a hexagonal lattice

Dateien

paper_377_PhysRev_mikuszeit2009.pdfGröße: 3.98 MBDownloads: 361

Datum

2009

Autor:innen

Mikuszeit, Nikolai

Baraban, Larysa

Vedmedenko, Elena Y.

Erbe, Artur

Leiderer, Paul

Wiesendanger, Roland

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik
Zukunftskolleg

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review B. 2009, 80, 14402. Available under: doi: 10.1103/PhysRevB.80.014402

Zusammenfassung

The magnetostatic interactions of colloidal particles, capped with radially magnetized Co/Pt multilayers, are modeled. Motivated by experiment the particles are arranged in microscopic two-dimensional clusters on a hexagonal lattice and are free to rotate. The thermodynamically stable states of clusters containing up to 108 particles are calculated theoretically by means of Monte Carlo simulations in the framework of multipole expansion. It is shown analytically that radially magnetized hemispheres have higher-order multipole moments beyond the dipole. Depending on geometrical details also even order moments appear. The even order moments break the inversion symmetry of the magnetic potential of a single particle. For a specific mixing ratio of dipole and quadrupole moments, the experimentally observed antiferromagnetic 120° Néel state in the clusters is found.

Fachgebiet (DDC)

530 Physik

Schlagwörter

two-dimensional clusters, multipole simulation

Zitieren

ISO 690

MIKUSZEIT, Nikolai, Larysa BARABAN, Elena Y. VEDMEDENKO, Artur ERBE, Paul LEIDERER, Roland WIESENDANGER, 2009. Quasiantiferromagnetic 120° Néel state in two-dimensional clusters of dipole-quadrupole-interacting particles on a hexagonal lattice. In: Physical Review B. 2009, 80, 14402. Available under: doi: 10.1103/PhysRevB.80.014402

BibTex

@article{Mikuszeit2009Quasi-5343,
  year={2009},
  doi={10.1103/PhysRevB.80.014402},
  title={Quasiantiferromagnetic 120° Néel state in two-dimensional clusters of dipole-quadrupole-interacting particles on a hexagonal lattice},
  volume={80},
  journal={Physical Review B},
  author={Mikuszeit, Nikolai and Baraban, Larysa and Vedmedenko, Elena Y. and Erbe, Artur and Leiderer, Paul and Wiesendanger, Roland},
  note={Article Number: 14402}
}

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