A RESONANCE SPIN FLIPPING OF POLARIZED NEUTRONS STUDIED ON MAGNETIC CLUSTER STRUCTURES

Polarised neutron transmission T(+/-) studies are performed in applied external magnetic fields versus neutron wavelength on a Li-Ti-Zn ferr ite system exhibiting a magnetocrystalline cluster structure. Distinct maxima for transmission T(-), measured at negative polarisation P-, a re observed and interpreted as due to the resonance spin nipping of ne utrons. This resonance Spin flipping is noticed for the first time on a dynamic magnetic cluster system in which the external magnetic field produces a rotating magnetic induction [B](perpendicular to), perpend icular to the constant guiding magnetic induction [B](parallel to). Po larised neutrons passing through this system interact with a rotating magnetic induction [B](perpendicular to)(t) connected with the correla ted interaction of cluster oscillators. Based on the observed resonanc e maxima of neutron transmission T(-), the perpendicular [B](perpendic ular to) and parallel magnetic induction [B](parallel to), as well as the length of the periodicity of the [B], component ''seen'' by the ne utrons are determined. The values of [B](perpendicular to) and [B](par allel to) are in good agreement with those obtained previously by us i n neutron depolarisation experiments. Moreover, magnetic ''cluster wav es'', induced by the external magnetic field are observed. It is found that the generated ''cluster waves'' in a coupled cluster system prop agate with the velocity of upsilon(f) approximate to 344 m/s. The mean gyromagnetic ratio gamma(c) of magnetic clusters is also determined a s gamma(c) approximate to-2.18 x 10(5) rad/s mT or gamma(c) approximat e to-3.47 x 10(4) Hz/mT.