Aerosol-generating article with multi-material susceptor

An aerosol-generating system, comprising:

• an electrically-operated aerosol-generating device comprising an inductor configured to produce a fluctuating electromagnetic field;
• and
• an aerosol-generating article
• comprising an aerosol-forming
• substrate;
• and
• a susceptor configured to heat the aerosol-forming substrate, the susceptor comprising a first susceptor material and a second susceptor material, the second susceptor material being different from the first susceptor material, the second susceptor material being plated, deposited, or welded onto the first material,
• wherein the first susceptor material has a first Curie temperature,
• wherein the second susceptor material has a second Curie temperature that is lower than 500° C.,
• wherein the second Curie temperature is lower than the first Curie temperature,
• wherein the first susceptor material is configured to heat the aerosol-forming substrate and the second susceptor material is configured to determine when the susceptor reaches a temperature corresponding to the second Curie temperature of the second susceptor material, and
• wherein, upon reaching the second Curie temperature, the second susceptor material reversibly changes from a ferromagnetic phase to a paramagnetic phase thereby causing a change in the apparent resistance of the susceptor,
• wherein the aerosol-generating article is configured to engage with the aerosol generating device such that the fluctuating magnetic field produced by the inductor induces a current in the susceptor, causing heating of the susceptor, and
• wherein the electrically-operated aerosol-generating device further comprises electronic circuitry configured to detect the Curie transition of the second susceptor material.

A method of using an aerosol-generating article comprising an aerosol forming substrate and a susceptor configured to heat the aerosol-forming substrate,

• the susceptor comprising a first susceptor material and a second susceptor material the second susceptor material being different from the first susceptor material, the second susceptor material being plated, deposited, or welded onto the first material,
• wherein the first susceptor material has a first Curie temperature,
• wherein the second susceptor material has a second Curie temperature that is lower than 500° C.,
• wherein the second Curie temperature is lower than the first Curie temperature,
• wherein the first susceptor material is configured to heat the aerosol-forming substrate and the second susceptor material is configured to determine when the susceptor reaches a temperature corresponding to the second Curie temperature of the second susceptor material, and
• wherein, upon reaching the second Curie temperature, the second susceptor material reversibly changes from a ferromagnetic phase to a paramagnetic phase thereby causing a chance in the apparent resistance of the susceptor, and
• the method comprising:
• positioning the aerosol-generating article relative to an electrically-operated aerosol generating device such that the susceptor of the aerosol-generating article is within a fluctuating electromagnetic field generated by the electrically-operated aerosol generating device, the fluctuating electromagnetic field causing heating of the susceptor;
• and
• monitoring at least one parameter of the electrically-operated aerosol-generating device to detect the Curie transition of the second susceptor material.