Patent ID: 11921835
Assignee: CROCUS TECHNOLOGY SA
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. An authentication method using a magnetic logic unit (MLU) device comprising one or a plurality of MLU-based magnetic cells, each MLU cell comprising a first ferromagnetic layer having a first magnetization, a second ferromagnetic layer having a second magnetization, and a spacing layer between the first and second ferromagnetic layers; an input device configured for generating an input signal adapted for changing the orientation of the first magnetization relative to the second magnetization, in the plurality of MLU cells, and vary a resistance of the MLU device; a bit line configured for passing a sense signal adapted for measuring said resistance; and a processing unit; wherein the input signal comprises a read magnetic field having a magnitude that varies by increment steps; wherein the processing unit is configured for computing an electrical variation from the sense signal and outputting an electrical variation signature; wherein the outputted electrical variation signature corresponds to the sense of the different MLU cells switching at different magnitudes of the read magnetic field; wherein the outputted electrical variation signature corresponds to the sense of the different MLU cells switching at different magnitudes of the read magnetic field;
wherein the processing unit comprises a comparison circuit configured for comparing the electrical variation signature to a reference electrical variation signature computed for a reference MLU device and outputting an output signal comprising information on the match or non-match between the electrical variation signature and the reference electrical variation signature;
wherein said electrical variation comprises a noise spectral density; and wherein the processing unit comprises a noise spectrum analyzer configured for computing a noise spectral density signature; the method comprising:
providing an input signal for changing the orientation of the first magnetization relative to the second magnetization and vary a resistance of the MLU device, wherein the input signal comprises a read magnetic field;
providing a sense signal in the bit line for measuring said resistance;
varying a magnitude by increment steps of the read magnetic field;
computing an electrical variation from the sense signal; and outputting an electrical variation signature, the outputted electrical variation signature corresponding to the sense of the different MLU cells switching at different magnitudes of the read magnetic field.