Giovanni Finocchio

Affiliations=

• Department of Electronic Engineering, Industrial Chemistry and Engineering

University of Messina, C.da di Dio, I-98166, Messina, Italy

Title

Design of skyrmion racetrack memories based on micromagnetic simulations

Abstract

The racetrack memory [1] seems to be a promising candidate for the design of ultra-dense, low-cost and low-power storage technology in the light of the recent advances in term of materials, devices and performances, such as velocity [2,3]. Information can be coded in a magnetic region between two domain walls or, as predicted recently, in topological magnetic objects known as skyrmions. Here, we show the technological advantages and limitations of using Néel skyrmions manipulated by spin current generated via the spin-Hall effect as predicted by micromagnetic simulations by considering realistic experimental parameters [4]. Different scenarios will be discussed and a direct comparison between domain wall and skyrmion based racetrack memory will be presented in a context where the domain wall and skyrmion velocity are of the same order.

References

[1] S. S. P. Parkin, M. Hayashi, and L. Thomas, Science 320, 190 (2008). [2] S. Emori, U. Bauer, S.-M. Ahn, E. Martinez, and G. S. D. Beach, Nat. Mater. 12, 611 (2013). [3] S.-H. Yang, K.-S. Ryu, and S. Parkin, Nat. Nanotech. 10, 221 (2015). [4] R. Tomasello, E. Martinez, R. Zivieri, L. Torres, M. Carpentieri, and G. Finocchio, Sci. Rep. 4, 6784, (2014).