Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers

P Priyanka; N H Makani; R Banerjee; I Sarkar

doi:10.1088/1361-6528/aca983

Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers

Nanotechnology. 2022 Dec 23;34(10). doi: 10.1088/1361-6528/aca983.

Authors

P Priyanka¹, N H Makani², R Banerjee², I Sarkar¹

Affiliations

¹ Institute of Nano Science and Technology, Sector 81, Sahibzada Ajit Singh Nagar, Punjab 140306, India.
² Department of Physics, Indian Institute of Technology Gandhinagar, Palaj 382355, India.

PMID: 36562510
DOI: 10.1088/1361-6528/aca983

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.

Keywords: heterostructures; magnetic damping; spin mixing conductance; spin pumping; spintronics.