Abstract
A surface relief grating with a period of 30 µm is embossed onto the surface of magnetoactive elastomer (MAE) samples in the presence of a moderate magnetic field of about 180 mT. The grating, which is represented as a set of parallel stripes with two different amplitude reflectivity coefficients, is detected via diffraction of a laser beam in the reflection configuration. Due to the magnetic-field-induced plasticity effect, the grating persists on the MAE surface for at least 90 h if the magnetic field remains present. When the magnetic field is removed, the diffraction efficiency vanishes in a few minutes. The described effect is much more pronounced in MAE samples with larger content of iron filler (80 wt%) than in the samples with lower content of iron filler (70 wt%). A simple theoretical model is proposed to describe the observed dependence of the diffraction efficiency on the applied magnetic field. Possible applications of MAEs as magnetically reconfigurable diffractive optical elements are discussed. It is proposed that the described experimental method can be used as a convenient tool for investigations of the dynamics of magnetically induced plasticity of MAEs on the micrometer scale.
Highlights
Surface properties play a vital role in many physical processes
It is shown that the field-induced shape memory effect in magnetoactive elastomer (MAE) works on the micrometer scale
It is not the relief which is transferred to the MAE surface, but the modulation of the surface roughness takes place
Summary
Surface properties play a vital role in many physical processes They govern interfacial phenomena, such as friction, adhesion and wettability. Other phenomena on MAE surfaces that were demonstrated to be regulable by a magnetic field are wettability [14,15,26,27,28], adhesive properties [29,30,31,32], friction [33,34,35,36,37,38], drop splashing [39] and surface optical properties [21]. It was demonstrated that the total optical reflectivity and the type of reflection (specular or diffuse) could be controlled by the magnetic field
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