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In this paper the results of magnetic properties study for a series samples of R(Co 0.88 Fe 0.12 ) 2  type intermetallic compounds with a heavy rare-earth elements (R = Gd, Tb, Dy, Ho,  Er)  are presented. Such materials having a plateau-like temperature dependences of magnetic entropy change in the temperature range lower Curie point are considered as a promising functional materials for magnetic refrigerators. Their phase composition was controlled by X-ray diffraction analysis with a help of Bruker D8 Advance diffractometer. Magnetic field magnetization dependences –  M(H)  were measured using a SQUID magnetometer (MPMS-XL-7, Quantum Design) within the temperature range of 5 – 600 K in magnetic fields up to 5600 kA/m. The crystal lattice parameter –  a , Curie temperature –  T C , coercivity –  H c and residual magnetization –  M r values are analyzed as a functions of R-element atomic number. For compounds with Tb, Dy, Ho and Er the second picks on the high field susceptibility temperature dependences –  χ hf ( T ) were found in the temperature range lower their  T C .

Magnetic properties of R(Co0.88Fe0.12)2 quasi-binary compounds