VALUABLE DOCUMENT PROTECTED FROM FORGERY AND METHOD OF DETERMINING ITS AUTHENTICITY Russian patent published in 2017 - IPC B42D25/21 B42D25/369 D21H21/42 G07D7/04 

FIELD: physics.

SUBSTANCE: valuable document contains an identification mark based on the elements made of an amorphous ferromagnetic alloy. The elements are segments of microwires connected to each other, having the ability to emit electromagnetic pulses with a jump-like magnetization reversal under the influence of an external sinusoidal magnetic field. The intensity of the exciting magnetic field is chosen to be from 0.1 to 1000 A/m, and the frequency of this field is in the range of 0.1 to 100 KHz. The pulses emitted at the field magnetization have the options characteristic for the protective label of number: the number of pulses, the ratio of their intensities and phases measured relative to the zero-phase referred to the magnetic field, with the formation of a given code.

EFFECT: invention provides a high degree of protection of documents and reliability of determining their authenticity.

12 cl, 4 ex, 2 dwg