High Field Magnetization of RMn2

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Abstract
The high field magnetization of RMn 2 , where R stands for a rare-earth element, has been measured at 4.2 K by using pulsed magnetic fields up to about 300 kOe.The magnetizations of YMn 2 , PrMn 2 , NdMn 2 and SmMn 2 increase almost linearly with increasing magnetic field. The magnetization curves of GdMn 2 , TbMn 2 , DyMn 2 , HoMn 2 and BrMn 2 show a trend of saturation at high fields. The saturation magnetic moments per formula unit were estimated as 6.2 µ B , 9.5 µ B , 10.0 µ B , 10.3 µ B , 10.1 µ B , and 8.9 µ B for GdMn 2 , TbMn 2 , DyMn 2 , HoMn 2 (C15), HoMn 2 (C14) and ErMn 2 , respectively. These values are in agreement with the R 3+ moments except for GdMn 2 . The analysis on GdMn 2 excludes particularly a simple ferrimagnetic coupling between Gd and Mn moments.