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Effect of disorder on the linear and nonlinear magnetic susceptibilities of two manganeseporphyrin-based magnets

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5 Author(s)
Girƫu, M.A. ; Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106 ; Wynn, C.M. ; Sugiura, K.-I. ; Miller, Joel S.
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We analyze the effects of disorder on the magnetic properties of two manganeseporphyrins, [MnTPP][TCNE]∙x(o-DCB) and [MnTPP][TCNE]∙y(o-Xy) and (TPP=meso-tetraphenylporphyrinato, TCNE=tetracyanoethylene, o-Xy=o-xylene, o-DCB=o-dichlorobenzene, x≤3, y≤1). We present data for the in- and out-of-phase ac susceptibility and obtain the distribution of relaxation times using Cole–Cole analysis. The frequency dependence of the linear susceptibility suggests cluster glasslike behavior. The peak in the second harmonic of the ac susceptibility indicates the presence of a spontaneous magnetic moment. We propose that the unusual magnetic properties of these compounds reflect one-dimensional ferrimagnetic clusters interacting weakly through dipole-dipole interactions to form three-dimensional domains. © 1997 American Institute of Physics.

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Journal of Applied Physics  (Volume:81 ,  Issue: 8 )