The present invention provides metallic films containing a Group IVB or VB metal, silicon and optionally nitrogen by utilizing atomic layer deposition. At least one MI element detects an external magnetic field and outputs a sense signal. More preferably, a gel layer supported by a hydrophilic porous membrane 2 is coated with hydrophilic porous membranes 3 and 4. The record metadata may include a storage location of record data corresponding to the communication session, and the record data may include a recording of the communication session.