Polymorphism and anomalies of a magnetic anisotropy of ferromagnetic metals

The theory of 3d-metals' polymorphism (for Co as an example) is formulated within the framework of the one-fermion representation for band 4s- (h) and 3d- (f) electrons and within the framework of the representation of many-electron operator spinors for covalent bonds and their fluctuations (CBF). The concurrence of band branches, E-c(k) (e = h, f), and CBF, E-CBF(k), marks out the soft mode with minimum E-CBF(k(0)) = E-0. Maxima of E-c(k) and DOS peaks appear near the Fermi surface (k(0)-->k(F)). Polymorphic deformation u(s)(T) decreases E-0(u(s)) and destabilizes the f.c.c.-->h.c.p. transition (near the temperature T congruent to T-0) creates the uniaxial magnetic anistropy with a constant K-1(T) similar to lambda (2)u(s). The CBF soft mode gives the strong linear dependence K-1(T), the contribution to the heat capacity C(v)similar toT, and an anomaly of resistance near T-0. The expressions for u(s)(T) and elastic modulus' defects are obtained. The theoretical results interpret the experimental data.