Abnormal spin-pumping effect at Pt/NiFe interface by an oxidation of ferromagnet |
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Authors: | Sang-Il Kim Min-Su SeoJung-Hye Seo Hyung Joong YunJouhahn Lee Yeon Suk Choi Seung-young Park |
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Institution: | Division of Materials Science, Korea Basic Science Institute, Daejeon 305-806, Republic of Korea |
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Abstract: | The Inverse Spin Hall Effect (ISHE) voltage induced by spin-pumping was measured in Pt/nonoxidized or oxidized NiFe] samples. The spectrum shape of the DC voltage signal was well-reproduced by simple Lorentzian functions, which were consistent with the prediction of ISHE in Pt/nonoxidized NiFe sample. On the other hand, the voltage signal from the Pt/oxidized NiFe was significantly decreased in accordance with abnormal ferromagnetic resonance (FMR) behavior. The origin of the ISHE voltage degradation was investigated by the FMR spectrum and X-ray photoelectron spectroscopy (XPS) analyses. The spin-pumping was suppressed by the oxidation of NiFe layer and deficient Pt/NiFe interface. The well-defined ferromagnet and clear interface with a normal spin mixing conductance were experimentally demonstrated to be reasonable spin-pumping. |
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Keywords: | Ferromagnetic resonance Inverse spin Hall effect X-ray photoelectron spectroscopy Spin pumping |
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