Mapping the magnetic hyperfine field in GdCo5

The magnetic hyperfine field (Bhf ) in ferrimagnetic GdCo5 compound has been investigated as a function of temperature by Mössbauer effect (ME) spectroscopy and perturbed angular correlation (PAC) spectroscopy using 119Sn and 111Cd probe nuclei, respectively. Results show that the non-magnetic probe atoms 119Sn and 111Cd substitute all three non-equivalent positions in GdCo5: Gd, Co I , and Co II . For 119Sn and 111Cd probes at Gd sites, the saturation magnetic hyperfine fields are very different with values of B hf1 = 57.0(1) T and B hf1= 20.7(1) T, respectively. For 119Sn and 111Cd atoms localized at Co I and Co II sites the magnetic hyperfine fields are practically identical and, in saturation, reach the values of B hf2 = 11.6(1) T and B hf2 = 11.1(2) T, and B hf3 = 14.8(1) T and B hf3 = 14.4(2) T, respectively.