Method of analysing a magnetic material, this method comprising: a) excitation of the magnetic material simultaneously with: a low-frequency excitation magnetic field (H L) of periods T L, the period T L comprising at least first and second period fractions such that the average of the instantaneous value of the low-frequency magnetic field over the first period fraction is different from the average of its instantaneous value over the second period fraction, each period fraction having a duration of at least 100 nanoseconds and a high-frequency excitation magnetic field (H H), the variation of the instantaneous value of which over the course of time is periodic with a frequency f H, the frequency f H of the high-frequency excitation magnetic field being at least twice the frequency f L of the low-frequency magnetic field, wherein the method also comprises: b) the construction of a signature S of the magnetic material formed from at least two points S P, this construction including obtaining the value of each point S p by measuring, over each period fraction, the amplitude and possibly the phase of a harmonic of the magnetic field induced in the magnetic material, said amplitude and phase being obtained in response to the excitation during this period fraction, the harmonic having a frequency nf H, where n is a non-zero positive integer; and c) the identification and/or the determination (80; 90) of the mass of the magnetic material from several points of the constructed signature S, comprising the multiplication (52, 68) of several points of the signature S with, respectively, each corresponding point of a reference signature S ref i measured under the same conditions on a reference mass of the same magnetic material; and - the calculation of the mass of the magnetic material as a function of the result of this multiplication. a) excitation of the magnetic material simultaneously with: a low-frequency excitation magnetic field (H L) of periods T L, the period T L comprising at least first and second period fractions such that the average of the instantaneous value of the low-frequency magnetic field over the first period fraction is different from the average of its instantaneous value over the second period fraction, each period fraction having a duration of at least 100 nanoseconds and a high-frequency excitation magnetic field (H H), the variation of the instantaneous value of which over the course of time is periodic with a frequency f H, the frequency f H of the high-frequency excitation magnetic field being at least twice the frequency f L of the low-frequency magnetic field, wherein the method also comprises: a low-frequency excitation magnetic field (H L) of periods T L, the period T L comprising at least first and second period fractions such that the average of the instantaneous value of the low-frequency magnetic field over the first period fraction is different from the average of its instantaneous value over the second period fraction, each period fraction having a duration of at least 100 nanoseconds and a high-frequency excitation magnetic field (H H), the variation of the instantaneous value of which over the course of time is periodic with a frequency f H, the frequency f H of the high-frequency excitation magnetic field being at least twice the frequency f L of the low-frequency magnetic field, b) the construction of a signature S of the magnetic material formed from at least two points S P, this construction including obtaining the value of each point S p by measuring, over each period fraction, the amplitude and possibly the phase of a harmonic of the magnetic field induced in the magnetic material, said amplitude and phase being obtained in response to the excitation during this period fraction, the harmonic having a frequency nf H, where n is a non-zero positive integer; and c) the identification and/or the determination (80; 90) of the mass of the magnetic material from several points of the constructed signature S, comprising the multiplication (52, 68) of several points of the signature S with, respectively, each corresponding point of a reference signature S ref i measured under the same conditions on a reference mass of the same magnetic material; and - the calculation of the mass of the magnetic material as a function of the result of this multiplication. - the calculation of the mass of the magnetic material as a function of the result of this multiplication.