Abstract
The impact of orange peel coupling on spin current induced magnetization switching in a Co/Cu/Ni-Fe nanopillar device is investigated by solving the switching dynamics of magnetization of the free layer governed by the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation. The value of the critical current required to initiate the magnetization switching is calculated analytically by solving the LLGS equation and verified the same through numerical analysis. Results of numerical simulation of the LLGS equation using Runge-Kutta fourth order procedure shows that the presence of orange peel coupling between the spacer and the ferromagnetic layers reduces the switching time of the nanopillar device from 67 ps to 48 ps for an applied current density of 4 × 1012Am−2. Also, the presence of orange peel coupling reduces the critical current required to initiate switching, and in this case, from 1.65 × 1012Am−2 to 1.39 × 1012Am−2.
Highlights
Magnetization switching process in nanopillar devices has been a continuously growing topic of research in the recent years, because of its potential applications in ultra-high density recording media,[1] magnetic sensors,[2] magnetic memory devices,[3] read / write heads[3] etc
The impact of orange peel coupling on spin current induced magnetization switching in a Co/Cu/Ni-Fe nanopillar device is investigated by solving the switching dynamics of magnetization of the free layer governed by the Landau-Lifshitz-GilbertSlonczewski (LLGS) equation
Orange peel coupling depends on the thickness of the spacer layer and free layer, their individual effect on reducing the switching time is discussed in the forthcoming sections
Summary
Magnetization switching process in nanopillar devices has been a continuously growing topic of research in the recent years, because of its potential applications in ultra-high density recording media,[1] magnetic sensors,[2] magnetic memory devices,[3] read / write heads[3] etc. In the present paper, we investigate the impact of orange peel coupling on spin current induced magnetization switching in a Co/Cu/Ni-Fe nanopillar theoretically This is carried out by solving the magnetization switching dynamics of the free ferromagnetic layer governed by the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation both analytically and numerically.
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