Abstract
Interfacial interaction induced perpendicular magnetic anisotropy (PMA) is one of the research hotspots of magnetic recording thin films. The PMA of Pd/Co2MnSi(CMS)/Pd multilayers can be improved by increasing the interfaces of heavy metal/ferromagnetic (HM/FM). In order to study the effect of adding HM/FM interface on the PMA of multilayers, a Pd layer was inserted into the CMS of Pd/CMS/Pd film to form Pd/CMS(t/2)/Pd/CMS(t/2)/Pd multilayer structure with quadruple Pd/CMS interface, and the [Pd/CMS(t/2)]N was inserted into the Pd/CMS(t/2)/Pd film to form Pd/CMS(t/2)[Pd/CMS(t/2)]N/Pd multilayer structure. The results showed that the PMA and MS of Pd/CMS(t/2)/Pd/CMS(t/2)/Pd multilayers were enhanced. The maximum Keff was 52.3% higher than that of the Pd/CMS(t)/Pd structure. The increase of MS can effectively reduce the switching current density of the magnetic tunnel junction, and then reduce the energy consumption of magnetic record writing. For the Pd/CMS(3.5)/[Pd(0.8)/CMS(3.5)]N/Pd multilayers, the PMA peaked at N = 1. With the increase of N, the PMA decreases and gradually changes from PMA to IMA. This indicates that the increase of more Pd/CMS interfaces does not increase the PMA further. In addition, when N = 3 and 4, the expression of Keff values is inconsistent with the corresponding hysteresis loops, and the exchange bias effect of in-plane hysteresis loops appears at N = 4 and N = 5.
Published Version
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