The distribution of blocking temperature in NiFe-Ru/sub x/Rh/sub y/Mn bilayers

We report the distribution profiles of blocking temperature (T/sub b/) in Ru/sub x/Rh/sub y/Mn-NiFe interfaces with comparisons of FeMn, NiMn, and PtMn. The distribution of T/sub b/ at the temperature around 120/spl sim/150/spl deg/C decreased with increasing Rh content. The FWHM of the distribution profile in Ru/sub 4/Rh/sub 14/Mn is one half of that in ordered phase NiMn and PtMn. The unblocked ratio at 125/spl deg/C decreases with increasing Rh content, and becomes a minimum in Ru/sub 4/Rh/sub 14/Mn, which is one half of FeMn.