Giant Keplerate molecule Fe30 - the first octopole magnet

Details Giant Keplerate molecule Fe30 - the first octopole magnet Giant Keplerate molecule Fe30 - the first octopole magnet

2003-09-11

arxiv.org/abs/cond-mat/0309282v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 9 figures

Scientific paper

10.1209/epl/i2003-10059-5

The multipole expansion technique is applied to one of the largest magnetic molecules, Fe30. The molecule's dipole, toroid and quadrupole magnetic moments are equal to zero (in the absence of magnetic field) so the multipole expansion starts from the octopole moment. Probably the Fe30 molecule is the most symmetrical magnetic body synthesized so far. The magnetization process is considered theoretically in different geometries. Some components of the octopole moment experience a jump while the magnetization rises linearly up to its saturation value. An elementary octopole moment consisting of four magnetic dipoles is proposed as a hint for designing of an experiment for measurement of octopole magnetic moment components.

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