A multilevel cell spin transfer switching process in a full-Heusler Co2FeAl0.5Si0.5alloy spin-valve nanopillar was investigated using micromagnetic simulations. An intermediate state of two-step spin transfer magnetization switching was reported due to the four-fold magnetocrystalline anisotropy; however, we discovered the intermediate state has two possible directions of -90° and +90°, which could not be detected in the experiments due to the same resistance of the -90° state and the +90° state. The domain structures were analyzed to determine the mechanism of domain wall motion and magnetization switching under a large current. Based on two intermediate states, we reported a multilevel bit spin transfer multi-step magnetization switching by changing the magnetic anisotropy in a full-Heusler alloy nanopillar.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)