Computational assessment of possible origins of the back-hopping effect in magnetic tunnel junctions

Autor(en)

Peter Flauger, Claas Abert, Dieter Suess

Abstrakt

In this work we employ macrospin simulations of the magnetization dynamics obtained from the Landau-Lifshitz-Gilbert equation coupled to angular momentum transport yielded by the nonequilibrium Green's function formalism to investigate two possible origins of the back-hopping effect in magnetic tunnel junctions with one layer of a synthetic antiferromagnet as reference layer. One possible origin discussed in this work is an additional sign reversal of the dampinglike (parallel) torque component as a function of the applied voltage. The other is the destabilization and switching of the reference layer by the spin-transfer torque. We find that this destabilization gives rise to a dynamic behavior manifesting in a back-and-forth switching of the free layer, while the sign reversal of the dampinglike torque results in a second hysteresis loop.

Organisation(en)

Forschungsplattform MMM Mathematics-Magnetism-Materials, Physik Funktioneller Materialien

Journal

Physical Review B

Band

108

Anzahl der Seiten

10

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.108.014430

Publikationsdatum

07-2023

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus, 103018 Materialphysik, 103043 Computational Physics

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/285f931a-0a34-410c-b6c4-a3fcff9f4c70