Tilt-induced ferromagnetic ordering in anisotropic molecular monolayers

Mikhail Osipov, Gallani J.-L., D. Guillon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

It is shown that orientational ordering of anisotropic organic molecules with permanent magnetic dipoles in a tilted film should result in a macroscopic magnetisation in the plane of the film. The important requirement here is that the molecules are strongly biaxial, and the corresponding biaxial orientational
order parameter in the tilted phase is sufficiently large. The molecules should also be characterised by a reduced symmetry of the magnetic core compared with existing “single molecular magnets”. Possible symmetry groups of the molecular magnetic core, which allow for the existence of nonzero average magnetic moment, are discussed in detail. The tilt-induced ferromagnetic ordering of such molecules may be determined by nonmagnetic intermolecular interactions including, for example, quadrupole-quadrupole
electrostatic interaction or dispersion interaction between molecules of particular symmetry. Magnetic intermolecular interactions are not important here, and as a result the induced ferromagnetic state may be stable in any temperature range where the corresponding tilted film is stable. These general conclusions,
which form a theoretical foundation for the existence of novel fluid low-dimensional magnetic materials,are based on symmetry arguments and are supported by a simple mean-field molecular model. We also discuss how such induced ferromagnetic ordering may be observed in Langmuir-Blodgett films which seemto be the best candidates for preparing these magnetic materials.
LanguageEnglish
Pages213-221
Number of pages9
JournalEuropean Physical Journal E
Volume19
Early online date28 Feb 2006
DOIs
Publication statusPublished - 2006

Fingerprint

Molecular Models
Magnets
Monolayers
Molecules
Temperature
Magnetic cores
magnetic cores
Magnetic materials
molecules
symmetry
magnetic materials
interactions
Langmuir Blodgett films
Langmuir-Blodgett films
Magnetic moments
magnetic dipoles
Magnetization
magnets
magnetic moments
quadrupoles

Keywords

  • mathematics
  • statistics
  • anisotropic organic molecules
  • magnetisation

Cite this

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title = "Tilt-induced ferromagnetic ordering in anisotropic molecular monolayers",
abstract = "It is shown that orientational ordering of anisotropic organic molecules with permanent magnetic dipoles in a tilted film should result in a macroscopic magnetisation in the plane of the film. The important requirement here is that the molecules are strongly biaxial, and the corresponding biaxial orientationalorder parameter in the tilted phase is sufficiently large. The molecules should also be characterised by a reduced symmetry of the magnetic core compared with existing “single molecular magnets”. Possible symmetry groups of the molecular magnetic core, which allow for the existence of nonzero average magnetic moment, are discussed in detail. The tilt-induced ferromagnetic ordering of such molecules may be determined by nonmagnetic intermolecular interactions including, for example, quadrupole-quadrupoleelectrostatic interaction or dispersion interaction between molecules of particular symmetry. Magnetic intermolecular interactions are not important here, and as a result the induced ferromagnetic state may be stable in any temperature range where the corresponding tilted film is stable. These general conclusions,which form a theoretical foundation for the existence of novel fluid low-dimensional magnetic materials,are based on symmetry arguments and are supported by a simple mean-field molecular model. We also discuss how such induced ferromagnetic ordering may be observed in Langmuir-Blodgett films which seemto be the best candidates for preparing these magnetic materials.",
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Tilt-induced ferromagnetic ordering in anisotropic molecular monolayers. / Osipov, Mikhail; J.-L., Gallani; Guillon, D.

In: European Physical Journal E , Vol. 19, 2006, p. 213-221.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Tilt-induced ferromagnetic ordering in anisotropic molecular monolayers

AU - Osipov, Mikhail

AU - J.-L., Gallani

AU - Guillon, D.

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AB - It is shown that orientational ordering of anisotropic organic molecules with permanent magnetic dipoles in a tilted film should result in a macroscopic magnetisation in the plane of the film. The important requirement here is that the molecules are strongly biaxial, and the corresponding biaxial orientationalorder parameter in the tilted phase is sufficiently large. The molecules should also be characterised by a reduced symmetry of the magnetic core compared with existing “single molecular magnets”. Possible symmetry groups of the molecular magnetic core, which allow for the existence of nonzero average magnetic moment, are discussed in detail. The tilt-induced ferromagnetic ordering of such molecules may be determined by nonmagnetic intermolecular interactions including, for example, quadrupole-quadrupoleelectrostatic interaction or dispersion interaction between molecules of particular symmetry. Magnetic intermolecular interactions are not important here, and as a result the induced ferromagnetic state may be stable in any temperature range where the corresponding tilted film is stable. These general conclusions,which form a theoretical foundation for the existence of novel fluid low-dimensional magnetic materials,are based on symmetry arguments and are supported by a simple mean-field molecular model. We also discuss how such induced ferromagnetic ordering may be observed in Langmuir-Blodgett films which seemto be the best candidates for preparing these magnetic materials.

KW - mathematics

KW - statistics

KW - anisotropic organic molecules

KW - magnetisation

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