Hyperfine Fields in Rhodium-Based Ferromagnetic Heusler Alloys

Hyperfine fields at all the three sites in ferromagnetic Heusler alloys Rh 2 MnSn, Rh 2 FeSn and Rh 2 CoSn have been measured by spin echo method. The field at Sn site is negative (-26 kOe) in Rh 2 MnSn while it is positive (+55 kOe) in Rh 2 FeSn.