Abstract
We investigated an uncompensated (UC) layer in a magnetic trilayer CoFe/IrMn/NiFeusing soft x-ray resonant magnetic reflectivity. Under a carefully controlled magnetic field,we resolved two UC spins in the single antiferromagnetic (AFM) layer. We found thatthe unpinned spins formed at both sides within the 50 Å thick IrMn AFM layer:tUC1 = 17.8 Å forCoFe/IrMn(1) andtUC2 = 6.4 Å forIrMn(2)/NiFe. Moreover, we noted their different blocking temperatures, namelyTB = 500 K at the UC1 layer and 470 K at the UC2 layer. There might be no noticeable magneticinteraction of the pinned spins of the two separated UC layers. Our results verify thedistinct spatial separation of the two UC layers, despite the limited thickness of the singleAFM layer.
Published Version
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