Estimation of physical parameters of magnetic nanoparticles

Interaction of physical fields in the acoustomagnetic effect

“…Henceforward, the index i will be omitted. THEORETICAL SUBSTANTIATION The mechanism of perturbation of magnetization in a magnetic field transverse to the sound wave is described in detail in [12,14]. According to the con ception of superparamagnetism of MF, the MF mag netization oscillation amplitude ΔM in relative units β ξ = ΔM/ΔM max can be represented as a function of the parameter ξ:…”

“…The estimated value of the magnetic moment and diameter of large and small nanoparticles of the MF, m * max , d max , m * min , and d min , were obtained by the method of acoustogranulometric analysis [12]. These values are conditional, because the MF contains par ticles of various sizes and their aggregates, which is dis regarded in the proposed model.…”

“…An experimental installation used earlier for solv ing similar problems [12] has been essentially modern ized. First and foremost, the modernization concerns the methods of input of sound oscillation to MF.…”

“…Analysis of the relative amplitude of the induced EMF as a func tion of the magnetic field strength, among other gran ulometric methods [11], is a promising method for studying the geometric and magnetic parameters of magnetic nanoparticles [12][13][14]. However, the physi cal nature of the AME and peculiarities of the interac tion of physical fields inherent in this effect remain ununderstood.…”

“…In addition, if the lateral surface of the sound beam is bounded, then, depending on the mutual ori entation of the wave vector and the magnetic field vec tor, a dynamic demagnetizing field specific to this case arises [2,12].…”