Method of making magnetic recordings which cannot be altered without it being noticed

摘要: The invention relates to a method of recording magnetic signals on media containing an exchange-anisoptropic material at temperature lower than, equal or higher than the Neel this material. After has been made, medium is heated to, temperature, then cooled down below and following which it provided with indicator betrays re-heating. suitable for space-saving and, same time, authentic storage all data images are be preserved without risk falsification.