The effect of noncollinear antiferromagnetic layer on a ferromagnetic thin film with perpendicular magnetic anisotropy

Li-Zai Tsai^1,2*, Bo-Chien Huang^1,2, Yen-Fu Liu¹, Danru Qu¹, Jun-Zhi Liang³, S. F. Lee¹

¹Institute of Physics, Academia Sinica, Taipei, Taiwan
²Physics, National Taiwan University, taipei, Taiwan
³Physics, Fu Jen Catholic University, New Taipei City, Taiwan

* Presenter:Li-Zai Tsai, email:link21215@gmail.com

We performed electrical transport and magnetic measurements to investigate the effect of noncollinear antiferromagnetic layer on a ferromagnetic thin film with perpendicular magnetic anisotropy. We first tuned the thickness of Co in Pd/Co/Pd trilayer to find out whether the surface anisotropy would dominate and change the direction of the magnetic moment from in-plane to out-of-plane by measuring the hysteresis loop and the anomalous Hall effect. Perpendicular magnetic anisotropy (PMA) was found when Co thickness is less than 0.9 nm. We then fabricated IrMn/Pd/Co/Pd multilayer samples to see the change in the coercivity and the variation in damping parameter in the spin pumping effect. Our results show the complexities and diversities of noncollinear antiferromagnet.

Keywords: antiferromagnetic, Perpendicular magnetic anisotropy thin film