Dynamic behavior of magnetic hybrid films of polyvinyl butyral/iron oxide nanoparticles (PVB/Fe2O3) for their control as microactuators

Polymeric magnetic hybrid materials (PMHM) are a motivating research topic for microactuator technologies, as flexible magnetic devices or contactless manipulation, useful for many applications. However, the control of these microactuators remains a challenge due to the severe performances required and the nonlinear dynamics that typify them. This study performs an exhaustive experimental characterization of the nonlinear dynamics of a PMHM-film as a cantilever actuator. The PMHM-film consists of polyvinyl butyral (PVB) with iron oxide (Fe2O3) nanoparticles synthesized in-situ, at two different nominal concentrations of FeCl2. 4H(2)O. This work presents the synthesis of the PMHM-films (PVB/Fe2O3), their magnetic and morphological characterization, and the dynamic characterization at constant and sine magnetic fields. Magnetic characterization showed a superparamagnetic-like behavior of the material at room temperature, in accordance with previous works. A damped-like behavior is exposed with a maximum displacement of 0.99 mm when a constant magnetic field of 0.96 kOe is applied. In the sine magnetic field test, a nonlinear response and rate-dependent behavior when the frequency is increased were observed. Future work will consider the physical model of the dynamic behavior of the (PVB/Fe2O3) films and a control system to reduce the hysteresis nonlinearities.