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Vibration energy harvesting presents a relevant solution for powering small electronic devices. However,
the frequency bandwidth and recovered energy remain significant challenges for potential applications
on a larger scale [1]. The electromechanical coupling in energy harvesters is a crucial aspect that en-
sures an effective energy conversion process [2]. The classical approach commonly used in the literature
simplifies electromagnetic coupling to a linear model, often referred to as electrical damping. However,
due to the inherent nature of magnetic flux density, this coupling is nonlinear. Incorrect application of
the electromechanical coupling model may lead to significant errors [3]. In this paper, we demonstrate
that electromechanical coupling is inherently nonlinear and can be easily modified and optimized. We
focused on shaping electromechanical coupling through various configurations of an oscillating magnet
constructed from stacks of magnets and separators. Initially, electromechanical coupling was determined
using the finite element method and subsequently validated experimentally. Finally, the developed elec-
tromechanical coupling models were implemented into a magnetomechanical energy harvester system.
