Disclosed are a thin strip of an amorphous alloy having excellent workability, a nanocrystalline soft magnetic alloy which can stably provide good magnetic properties, and a magnetic core using the nanocrystalline soft magnetic alloy. Telecommunications devices in accordance with one embodiment of the present invention incorporate RF transceivers which are configured to read associated RF transponders in order to automatically dial desired telephone numbers without the need for a manual user interface. For partial cross-linking of the polymer substances having aldehyde groups such as glucose or evolving aldehydes such as hexamethylenetetramine or their mixtures are used.