Magnetic ordering in an organic polymer

A. Rajca, J. Wongsriratanakul, S. Rajca

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Abstract

We describe preparation and magnetic properties of an organic π-conjugated polymer with very large magnetic moment and magnetic order at low temperatures. The polymer is designed with a large density of cross-links and alternating connectivity of radical modules with unequal spin quantum numbers (S), macrocyclic S = Z and, cross-linking S = 1/2 modules, which permits large net S values for either ferromagnetic or antiferromagnetic exchange couplings between the modules. In the highly cross-linked polymer, an effective magnetic moment corresponding to an average S of about 5000 and slow reorientation of the magnetization by a small magnetic field (less than or equal to 1 oersted) below a temperature of about 10 kelvin are found. Qualitatively, this magnetic behavior is comparable to that of insulating spin glasses and blocked superparamagnets.

Original languageEnglish (US)
Pages (from-to)1503-1505
Number of pages3
JournalScience
Volume294
Issue number5546
DOIs
StatePublished - Nov 16 2001

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