A heartbeat detection device includes a pair of electrode units, a transmitting unit and a receiving unit. For example, one embodiment is directed toward a method of fabricating a memory cell on a workpiece having a substrate, a plurality of active areas in the substrate, and a dielectric layer over the active areas. A method for producing the Fe-based foams includes the in situ decomposition of a hydride in a molten Fe-based alloy. A pair of leg assemblies are pivotably mounted to the mounting surfaces of the pivot body so that each leg assembly may be pivoted about an axis that is generally normal to the mounting surface and such that each leg assembly can be adjustably positioned in one of at least two positions.