Heavy metal deposition temperature tuned spin pumping efficiency control in permalloy/tantalum bilayers. (5th March 2023)

• Record Type: Journal Article
• Authors: Priyanka, P; Makani, N H; Banerjee, R; Sarkar, I
• Is Part Of: Nanotechnology. Volume 34:Number 10(2023)
• Publication Date: 2023-03-05
• Subjects: spin pumping -- heterostructures -- spintronics -- spin mixing conductance -- magnetic damping; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aca983
• Languages: English
• ISSNs: 0957-4484

Abstract

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 ×10 18 m −2 is obtained with α -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.