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Issue 14, 2017, Issue in Progress

Two magnon scattering and anti-damping behavior in a two-dimensional epitaxial TiN/Py(tPy)/β-Ta(tTa) system

Author affiliations

Abstract

The prime requirements for the spin transfer torque based ferromagnetic (FM)/nonmagnetic (NM) bilayer spin devices are (i) the absence of two-magnon scattering (TMS) noise, (ii) minimum energy dissipation and (iii) fast switching. To realize these objectives we have studied the thickness, Py (permalloy) thicknesses (tPy) and β-Ta thicknesses (tTa), dependent magnetization dynamics behaviour of the epitaxial Py (tPy = 3–20 nm)/β-Ta (tTa = 1.5–15 nm) system. The tPy dependence of TMS in epitaxial Py nano-layers (tPy = 3–20 nm) grown on a Si(400)/TiN(200) (8 nm) substrate is explored in terms of uniform and non-uniform magnetization precession regimes by employing ferromagnetic resonance field (Hr), line-width (ΔH), and Gilbert damping constant (α) behaviour. It is found that in Py, tPy < 10 nm, layers TMS is dominating due to non-uniform precession of the magnetization. However in Py, tPy ≥ 10 nm, layers the uniform magnetization precession dominates, therefore Py layers, tPy ≥ 10 nm, are almost free from TMS. Furthermore, a nearly TMS free 12 nm epitaxial Py(200) layer is capped with β-Ta (tTa = 1.5–15 nm) layers to explore the tTa dependent magnetization precession of epitaxial Py (12 nm) in terms of change in effective Gilbert damping constant (αeff). An anomalous decrease in αeff from 0.0087 at tTa = 0 to a minimum value of 0.0077 at tTa = 6 nm, and its subsequent increase for tTa > 6 nm are observed in the epitaxial Py (12 nm)/β-Ta(tTa) system. Therefore the Si(400)/TiN(200) (8 nm)/Py(200) (12 nm)/β-Ta(200) (6 nm) epitaxial system with nearly uniform magnetic precession and minimum effective Gilbert damping is suitable for low energy loss and ultrafast switching applications in spin transfer torque devices.

Graphical abstract: Two magnon scattering and anti-damping behavior in a two-dimensional epitaxial TiN/Py(tPy)/β-Ta(tTa) system

Supplementary files

Article information


Submitted
28 Oct 2016
Accepted
16 Jan 2017
First published
23 Jan 2017

This article is Open Access

RSC Adv., 2017,7, 8106-8117
Article type
Paper

Two magnon scattering and anti-damping behavior in a two-dimensional epitaxial TiN/Py(tPy)/β-Ta(tTa) system

N. Behera, A. Kumar, S. Chaudhary and D. K. Pandya, RSC Adv., 2017, 7, 8106 DOI: 10.1039/C6RA25980D

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