Problem of the production, investigation, and use of a microwire with
an amorphous vein structure are discussed. It is determined that the m
agnetic properties of microwires depend heavily on the domain structur
e. It is established that a domain-free structure, which is characteri
zed by a high coercive force, is also possible in a microwire. The phe
nomenon of natural ferromagnetic resonance (NFMR) in an amorphous micr
owire in the range of superhigh frequencies is investigated experiment
ally. The significance of an internal field of anisotropy, which gives
rise to NFMR is examined. Theoretical relationships describe experime
ntal data on NFMR well.