Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 3, Pages 207-212Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.08.103
Keywords
Single-molecule magnet; Mn(12)-acetate; Azobenzene; Organic/inorganic hybrid material; Polymer
Funding
- Opto-Science and Technology
- Japan and Mizuho Foundation
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In order to examine the effects of polymer matrix substituting crystalline solvents and photoisomerization of azobenzene in photo-modulation of AC susceptibility discovered recently, we have compared various quantum magnetic properties of new organic/inorganic hybrid materials composed of Mn(12)-acetate (a typical single-molecule magnet, [Mn(12)(CH(3)COO)(16)(H(2)O)(4)O(12)]center dot 2CH(3)COOH center dot 4H(2)O) containing or not containing azobenzene casted into polymethylmethacrylate ( PMMA) films on Polyvinylalchol (PVA) films. The M-H hysteresis loops below blocking temperature for both materials exhibited distinct differences of the dM/dH vs. H plots, which suggested azobenzene as well as crystalline solvents resulted in tuning of magnetic properties. Moreover, the AC susceptibility at 0.1-1000 Hz frequencies provided activation energy U(eff) = 87 K from Arrhenius law for both materials, albeit Cole-Cole plots indicated perturbation of quantum magnetization for both hybrid materials in polymer matrix. (C) 2008 Elsevier B.V. All rights reserved.
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