; Liu, Jiwen
; Ma, Yongchang] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Photoelect Mat & Devices, Tianjin 300191, Peoples R China
; [Wu, Zhonghua] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China
The structural and magnetic properties of NiFe/PtMn bilayers with a (Ni81Fe19)(100-x)Cr-x seed layer were investigated. It is found that the pinning field H, of NiFe/PtMn bilayers is very sensitive to the Cr content of the (Ni81Fe19)(100-x)Cr-x seed layer, which can effectively influence the grain size, L1(0) ordering phase transformation and the critical thickness of PtMn as well as the blocking temperature (T-b). When the Cr content is 40 at%, PtMn shows a large grain size, a small critical thickness and a high blocking temperature, but the degree of L1(0) ordering phase transformation is weak after annealing, which results in a low pinning field H, When the Cr content is below 34 at% or above 50 at%, PtMn has a small grain size, a large critical thickness and a low blocking temperature, but the degree of L1(0) ordering phase transformation is very good after annealing, resulting in a high pinning field H, These results indicate that (Ni81Fe19)(100-x)Cr-x can be a promising seed layer in spin valves based on Mn-alloyed antiferromagnets.