Significant reduction of critical currents in MRAM designs using dual free layer with perpendicular and in-plane anisotropy

Autor(en)

Dieter Süss, Christoph Vogler, Florian Bruckner, Hossein Sepehri-Amin, Claas Abert

Abstrakt

One essential feature in magnetic random access memory cells is the spin torque efficiency, which describes the ratio of the critical switching current to the energy barrier. In this paper, it is reported that the spin torque efficiency can be improved by a factor of 3.2 by the use of a dual free layer device, which consists of one layer with perpendicular crystalline anisotropy and another layer with in-plane crystalline anisotropy. Detailed simulations solving the spin transport equations simultaneously with the micromagnetics equation were performed in order to understand the origin of the switching current reduction by a factor of 4 for the dual layer structure compared to a single layer structure. The main reason could be attributed to an increased spin accumulation within the free layer due to the dynamical tilting of the magnetization within the in-plane region of the dual free layer.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

National Institute for Materials Science

Journal

Applied Physics Letters

Band

110

Anzahl der Seiten

5

ISSN

0003-6951

DOI

https://doi.org/10.1063/1.4987140

Publikationsdatum

2017

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/0e0651a7-8989-415e-b496-b1555de3fe26