期刊
APPLIED PHYSICS LETTERS
卷 110, 期 25, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4987140
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资金
- Austrian Federal Ministry of Science, Research and Economy
- National Foundation for Research, Technology and Development
- Austrian Science Fund (FWF) [F4112 SFB ViCoM, I2214-N20]
- Vienna Science and Technology Fund (WWTF) [MA14-044]
- Austrian Science Fund (FWF) [I2214] Funding Source: Austrian Science Fund (FWF)
One essential feature in magnetic random access memory cells is the spin torque efficiency, which describes the ratio of the critical switching current to the energy barrier. In this paper, it is reported that the spin torque efficiency can be improved by a factor of 3.2 by the use of a dual free layer device, which consists of one layer with perpendicular crystalline anisotropy and another layer with in-plane crystalline anisotropy. Detailed simulations solving the spin transport equations simultaneously with the micromagnetics equation were performed in order to understand the origin of the switching current reduction by a factor of 4 for the dual layer structure compared to a single layer structure. The main reason could be attributed to an increased spin accumulation within the free layer due to the dynamical tilting of the magnetization within the in-plane region of the dual free layer. Published by AIP Publishing.
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