  The theory on the magnetic field energy absorption by metal nanoparticles of
a nonspherical shape irradiated with ultrashort laser pulses of different
duration is developed. The effect of both the particle surface and the particle
shape on the absorbed energy is studied. For the particles having an oblate or
prolate spheroidal shape, the dependence of this energy on the orientation of
the magnetic field upon a particle, the degree of its deviation from a
spherical shape, a pulse duration, and the carrier frequency of the laser ray
are found. A significant increase in the absorption is established when an
electron mean free path coincides with the size of the particle. The Drude and
kinetic approaches are used and the results are compared with each other.
