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A multilevel cell spin transfer switching process in a full-Heusler Co₂FeAl₀.₅Si₀.₅ alloy 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.Department of Mechanical EngineeringAuthor name used in this publication: Shi, S. Q

Simulation of multilevel cell spin transfer switching in a full-Heusler alloy spin-valve nanopillar