Micro-electro-mechanical systems (MEMS) are mechanical devices, which exhibit also electrical properties. The simplest and first commercialized MEMS¹ was the accelerometer, which takes advantage of the inertial principle to sense acceleration. The inertial mass displacement is transduced to an electrical signal by detecting the change of capacitance between the moving mass and a fixed electrode. Several types of MEMS devices are now commercially available² (gyroscopes, micromirrors, pressure sensors, microphones, real-time clocks, etc.), while several other are being developed (magnetometers³, energy-harvesters⁴, MEMS for photonics⁵, etc.). MEMS have also been widely used to modulate the magnetic signal in magnetoresistive sensors⁶. Integrating MEMS with magnetic elements can enable new applications (magnonics and more generally spintronics) and strengthen existing ones (micromirrors, microspeakers, etc.).