Abstract
The structural and magnetic properties of NiFe/PtMn bilayers with a (Ni81Fe19)100−xCrx seed layer were investigated. It is found that the pinning field Hex of NiFe/PtMn bilayers is very sensitive to the Cr content of the (Ni81Fe19)100−xCrx seed layer, which can effectively influence the grain size, L10 ordering phase transformation and the critical thickness of PtMn as well as the blocking temperature (Tb). 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 L10 ordering phase transformation is weak after annealing, which results in a low pinning field Hex. 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 L10 ordering phase transformation is very good after annealing, resulting in a high pinning field Hex. These results indicate that (Ni81Fe19)100−xCrx can be a promising seed layer in spin valves based on Mn-alloyed antiferromagnets.
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