Patent ID: 7898251

Claim:
A method for the individualized characterization of magnetic elements based on ferromagnetic resonance, wherein each of the magnetic elements exhibits properties of ferromagnetic resonance and each of the magnetic elements has a resonance frequency, the method comprising: applying in a given area a low-frequency electromagnetic field, wherein the low frequency is between 50-800 Hz; simultaneously applying in the given area an electromagnetic wave of a high frequency, between 0.5-20 GHz equal to the resonance frequency of a magnetic element; inserting the magnetic element in the given area in order for the magnetic element to absorb the high-frequency electromagnetic wave with a frequency that is the same as that of the low-frequency electromagnetic field, so the high frequency electromagnetic wave is modulated with a frequency equal to the frequency of the low-frequency electromagnetic field; receiving a unique and individual modulated wave characteristic of each magnetic element; and assigning the unique and individual modulated wave characteristic to each magnetic element, wherein the assignment of the unique and individual modulated wave characteristic to each magnetic element includes modifying a modulated wave by using a low frequency hysteresis loop which characterizes the respective magnetic element.