TY - JOUR
T1 - Efficient domain wall motion in asymmetric magnetic tunnel junctions with vertical current flow
AU - Liu, S.
AU - de Sousa, D. J.P.
AU - Sammon, M.
AU - Wang, J. P.
AU - Low, Tony
N1 - Publisher Copyright:
© 2021
PY - 2022/5/1
Y1 - 2022/5/1
N2 - In this paper, we study the domain wall motion induced by vertical current flow in asymmetric magnetic tunnel junctions. The domain wall motion in the free layer is mainly dictated by the current-induced field-like torque acting on it. We show that as we increase the MTJ asymmetry, by considering dissimilar ferromagnetic contacts, a linear-in-voltage field-like torque behavior is accompanied by an enhancement in the domain wall displacement efficiency and a higher degree of bidirectional propagation. Our analysis is based on a combination of a quantum transport model and magnetization dynamics as described by the Landau–Lifshitz–Gilbert equation, along with comparison to the intrinsic characteristics of a benchmark in-plane current injection domain wall device.
AB - In this paper, we study the domain wall motion induced by vertical current flow in asymmetric magnetic tunnel junctions. The domain wall motion in the free layer is mainly dictated by the current-induced field-like torque acting on it. We show that as we increase the MTJ asymmetry, by considering dissimilar ferromagnetic contacts, a linear-in-voltage field-like torque behavior is accompanied by an enhancement in the domain wall displacement efficiency and a higher degree of bidirectional propagation. Our analysis is based on a combination of a quantum transport model and magnetization dynamics as described by the Landau–Lifshitz–Gilbert equation, along with comparison to the intrinsic characteristics of a benchmark in-plane current injection domain wall device.
KW - Domain wall
KW - Magnetic tunnel junctions
KW - Spin transfer torque
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U2 - 10.1016/j.jmmm.2021.168949
DO - 10.1016/j.jmmm.2021.168949
M3 - Article
AN - SCOPUS:85123029368
SN - 0304-8853
VL - 549
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
M1 - 168949
ER -