Effect of 3d- and 4d-Transition Impurities on Magnetic Anisotropy of Hexagonal Cobalt

Abstract

The temperature where the uniaxial anisotropy constant K_u1 vanishes, was measured for hexagonal cobalt alloys containing a small amount (below 2 at%) of 3d or 4d impurities by means of NMR. The temperatures for 1.0 at% alloys were found to be 518±2 (Ti), 542±2 (V), 569±1 (Cr), 525±2 (Mn), 475±1 (Fe), 533±1 (Ni), 520±1 (Cu), 524±3 (Nb), 560±2 (Mo), 519±1 (Ru), 510±2 (Rh), and 506±2 K (Pd). The temperature where K_u1=−2K_u2 was also measured.