Magnetic Moment Measurements in Single-Crystal Dy, Ho, Er, and Gd in dc Fields up to 170 kG

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Abstract
Magnetic‐moment measurements are presented for single‐crystal1 Dy, Ho, Er and Gd with applied fields up to 170 kG. These results, obtained for various crystallographic orientations with a low frequency VSM developed for use in the NML dc solenoids, extend and augment a number of earlier measurements, including the recent pulsed field data of Flippen.2 The magnetic data are complex as is expected from the known magnetic structures at low fields. Briefly, at 4.2°K and with B0 ‖ C we find: (a) Dy‐M increases slowly up to 170 kG; (b) Ho‐M increases rapidly up to 12 kG, then more slowly, and there is a further rapid increase (transition) at about 130 kG; (c) Er‐M increases rapidly up to 30 kG then approaches saturation more slowly; (d) Gd‐M increases rapidly up to 25 kG and then is almost constant. For B0⊥C we find: (a) Dy‐M increases rapidly at low fields and approaches saturation at high fields; (b) Ho‐M increases rapidly at low fields and approaches saturation at high fields; (c) Er—broad transitions occur at about 16 and 120 kG; (d) Gd—the results are similar to those for B0 ‖ C. Except for Gd, the magnetic moments generally show an appreciable increase up to our maximum fields. Magnetic‐moment measurements have also been completed for these materials at 77°K. The results will be published elsewhere.

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