Spin orbit torque (SOT) has attracted much attention as an energy efficient electrical method to switch the magnetization in single magnetic layer with both in-plane and perpendicular anisotropy. Here, we report SOT switching of synthetic antiferromagnetic and ferrimagnetic Co/Ir/Co trilayers, where the net magnetization and the interlayer coupling strength are highly controllable. A weak external field dependence of the SOT switching was observed due to the robust domain wall structure in the trilayer. The switching current density was observed to scale inversely with the net magnetization. For trilayers with the same net magnetization, switching current is independent of the layer order because switching in the thicker Co layer dominates. In both ferromagnetic and antiferromagetic regimes, the switching current reflects the interlayer coupling strength.
Bibliographical noteKAUST Repository Item: Exported on 2020-11-02
Acknowledged KAUST grant number(s): OSR2017-CRG6-3427.01
Acknowledgements: For their work at JHU, the authors acknowledge the support from the U.S. Department of Energy (DOE), Basic Energy Science Award No. DE-SC0009390, and KAUST (Grant No. OSR2017-CRG6-3427.01). Q.M. acknowledges discussion with Weiwei Lin.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.