Magnetic properties of R/sub n+1/Co/sub 3n+5/B/sub 2n/ compounds with R=Y or Gd

摘要

Magnetic properties of (Gd/sub x/Y(1-x)/sub n+1/Co/sub 3n+5/B/sub 2n/ compounds with n=1, 2, 3 and n/spl rarr//spl infin/ were studied in the temperature range 4-800 K and external field up to 7 T. The compounds with x/spl ges/0.2 are ferrimagnetically ordered. The cobalt and gadolinium magnetizations at 4 K, compensate at x=0.43 (n=1), x=0.31 (n=2) and x=0.26 (n=3). Within a given series, the mean cobalt moments determined at 4 K are strongly dependent on the composition, while the effective cobalt moments deduced from the Curie constants in the paramagnetic phase are only a little composition dependent. The magnetic behaviour of cobalt in the studied system is analyzed.