Fig. 4
From: Magnetic origami creates high performance micro devices
Fabrication of electrostatic capacitors using axial static magnetic field assembly. a Capacitor fabrication steps and cross-section of planar layer stack. b Rolling process is initiated by wet release of the ferromagnetic-strained layer stack from the sacrificial layer starting at the opened windows. c During the strain-induced self-assembly, the capacitors are stabilized by an axially (perpendicular to desired rolling direction) applied magnetic field \(\vec H\) and the arising magnetostatic forces between the magnetized windings. The inset illustrates the final assembly state. d Optical microscopic image of the assembled capacitor. Scale bar is 200 μm. e Capacitance and phase angle as a function of frequency including areal capacitance density for planar and rolled state
