A light-emitting element is provided having a layered structure composed of at least a light-emitting layer having a light-emitting region and a reflective layer for reflecting light emitted from the light-emitting region. The method includes the steps of receiving a service request from network device of a user, checking whether the user is registered or not, and if the user is not registered, generating a response message including a warn information and sending the response message to the network device of the user. Additional ferromagnetic and non-magnetic layers can be added, in an alternating fashion, to produce other laminated structures.