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  • Title: Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers.
    Author: Priyanka P, Makani NH, Banerjee R, Sarkar I.
    Journal: Nanotechnology; 2022 Dec 23; 34(10):. PubMed ID: 36562510.
    Abstract:
    Spin pumping is a key property for spintronic application that can be realized in heavy metal/ferromagnet bilayers. Here we demonstrate the possibility of improving spin pumping in permalloy (Py)/tantalum (Ta) bilayers through control of Ta heavy metal deposition temperature. Through a combination of structural and ferromagnetic resonance based magnetization dynamics study, we reveal the role of Ta deposition temperature in improving spin mixing conductance which is a key parameter for spin pumping across the Py/Ta interface. The results show that by depositing Ta above room temperature, a high spin mixing conductance of 7.7 ×1018m-2is obtained withα-Ta layer. The results present an understanding of the correlation between heavy metal deposition temperature and interface structure improvement and consequent control of spin pumping in Py/Ta bilayers.
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