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Structural phase transformations in annealed Pt/Mn/Fe trilayers
I O Kruhlov1, O V Shamis1, N Y Schmidt2
1Metal Physics Department, National Technical University of Ukraine, 'Igor Sikorsky Kyiv Polytechnic Institute', Prospect Peremogy 37, 03056 Kyiv, Ukraine.
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Thermally-activated phase transitions in Pt/Mn/Fe thin films were investigated by a combination of x-ray diffraction, transmission electron microscopy, secondary neutral mass spectrometry depth profiling, atomic force microscopy, and magnetic properties measurements. Post-annealing was carried out in vacuum to different temperatures up to 620 °C. Initially, at temperatures between 280 °C-450 °C first L10-MnPt is formed at the Mn/Pt interface followed by the most likely formation of metastable bcc Fe3Pt, which gets transformed by further annealing to fcc Fe3Pt and eventually to chemically ordered L12-Fe3Pt. The final product after annealing at 620 °C consists of two interesting phases, which are relevant for spintronic applications, antiferromagnetic L10-MnPt with addition of Fe and ferromagnetic L12-Fe3Pt, consistent with the initial element composition.
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