Tilt-induced ferromagnetic ordering in anisotropic molecular monolayers

The European Physical Journal. E, Soft Matter
M A OsipovD Guillon

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 b...Continue Reading

References

Dec 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·M A OsipovA Sprick
Oct 5, 2001·Journal of the American Chemical Society·J F NierengartenD Guillon
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·M A Osipov, D Guillon
Jan 28, 2003·Angewandte Chemie·Dante Gatteschi, Roberta Sessoli
Apr 17, 2003·Angewandte Chemie·Andrea CorniaHerre S J Van der Zant
Nov 3, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·J-L GallaniS Nakatsuji
Dec 17, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M D Ossowska-ChruścielS Zalewski
Jan 26, 2005·Angewandte Chemie·Massimiliano CavalliniFabio Biscarini

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