Abstract
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, CoI, and CoII. For 119Sn and 111Cd probes at Gd sites, the saturation magnetic hyperfine fields are very different with values of Bhf1 = 57.0(1) T and Bhf1= 20.7(1) T, respectively. For 119Sn and 111Cd atoms localized at CoI and CoII sites the magnetic hyperfine fields are practically identical and, in saturation, reach the values of Bhf2 = 11.6(1) T and Bhf2 = 11.1(2) T, and Bhf3 = 14.8(1) T and Bhf3 = 14.4(2) T, respectively.
Highlights
Compounds of the series RECo5 have a great potential for practical applications as permanent magnets with colossal coercivity.[1]
We report results of a comparative study of the magnetic hyperfine fields for non-magnetic 119Sn and 111Cd probes in the GdCo5 compound measured, respectively, by Mössbauer spectroscopy (MS) and perturbed angular correlation (PAC) spectroscopy
One piece was re-melted with 0.5 at.% of tin enriched by the 119Sn isotope to form the sample intended for Mössbauer measurements. 111In carrier-free as 111InCl3 solution was deposited on another part of the sample which was re-melted in the arc furnace to prepare the sample for PAC spectroscopy measurements with 111Cd
Summary
Compounds of the series RECo5 (where RE is a rare-earth metal) have a great potential for practical applications as permanent magnets with colossal coercivity.[1]. The RECo5 compounds are ferromagnetically ordered for the light RE metals (RE and Co magnetic moments are aligned), and present ferrimagnetic ordering for the heavy RE (RE and Co moments are unaligned). These compounds have high magnetic ordering temperatures reaching 1000 K due to intensive Co-Co magnetic exchange interaction. Neutron diffraction study[2,3,4] and Mössbauer investigation using RE isotopes and 57Fe impurity nuclei[5,6] allow to investigate the dependence of the magnetic moments of RE and Co sublattices of RECo5 compounds with the increase of temperature or pressure
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