Comparative Study of Spin Pumping in Epitaxial- and Polycrystalline-NiO/Ni80Fe20

Author:

Khan Kacho Imtiyaz Ali1,Gupta Pankhuri1,Agarwal Rekha1,Chowdhury Niru1,Muduli Pranaba Kishor1ORCID

Affiliation:

1. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

Abstract

We perform a comparative study of spin pumping in NiO/Ni[Formula: see text]Fe[Formula: see text] (Py) by altering the crystallinity of NiO. We simultaneously grow high-quality NiO/Py heterostructures on Si/SiO2 and Al2O3(0001) substrates. Although the growth on Si/SiO2 substrate produced polycrystalline NiO (Poly-NiO), the growth on Al2O3(0001) substrate produced epitaxial NiO (Epi-NiO). Our ferromagnetic resonance measurements reveal the presence of two-magnon scattering (TMS) in the measured linewidth for the Epi-NiO/Py system. By carefully considering the contribution of TMS, we found the effective spin mixing conductance, g[Formula: see text] to be comparable in both Poly-NiO/Py and Epi-NiO/Py, despite the different crystallinity of NiO. Our findings show that g[Formula: see text] of an optimized polycrystalline-NiO/Py system can reach the value for an epitaxial-NiO/Py system.

Funder

Ministry of Human Resource Development

Department of Electronics and Information Technology

Joint Advanced Technology Centre, IIT Delhi

Department of Science and Technology

UGC India

Science and Engineering Research Board

Publisher

World Scientific Pub Co Pte Ltd

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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