MAGNETIC-FLUID OSCILLATOR - OBSERVATION OF NONLINEAR PERIOD DOUBLING

被引:26
|
作者
BACRI, JC
DORTONA, U
SALIN, D
机构
[1] Laboratoire de Acoustique et Optique de la Matière Condensèe, Univerité Pierre et Marie Curie, 75252 Paris CEDEX 05, Tour 13
关键词
D O I
10.1103/PhysRevLett.67.50
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The peak pattern of a magnetic fluid, in both a vertical dc and an additional vertical ac magnetic field, behaves as an oscillator. Using the ac-dc field ratio as a control parameter, we study the dynamics of this oscillator. For low values, the peaks oscillate at the ac field frequency, whereas for a large enough value the oscillation is subharmonic (period doubling). The phase diagram is interpreted in terms of a bounded parametric resonance driven by the nonlinearity of the oscillator. In 2D this transition occurs with symmetry breaking from a triangular to a square pattern.
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页码:50 / 53
页数:4
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