On the temperature-dependent characteristics of perpendicular shape anisotropy-spin transfer torque-magnetic random access memories
AffiliationDepartment of Physics, University of Arizona
MetadataShow full item record
PublisherAmerican Institute of Physics Inc.
CitationZhang, W., Tong, Z., Xiong, Y., Wang, W., & Shao, Q. (2021). On the temperature-dependent characteristics of perpendicular shape anisotropy-spin transfer torque-magnetic random access memories. Journal of Applied Physics, 129(22).
JournalJournal of Applied Physics
RightsCopyright © 2021 Author(s). Published under an exclusive license by AIP Publishing.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractThe perpendicular shape anisotropy-spin transfer torque-magnetic random access memories (PSA-STT-MRAMs) take advantage of the nanopillar free-layer geometry for securing a good thermal stability factor from the shape anisotropy of the nanomagnet. Such a concept is particularly well-suited for small junctions down to a few nanometers. At such a volume size, the nanopillar can be effectively modeled as a Stoner-Wohlfarth particle, and the shape anisotropy scales with the spontaneous magnetization by ∼ M s 2. For almost all ferromagnets, M s is a strong function of temperature; therefore, the temperature-dependent shape anisotropy is an important factor to be considered in any modeling of the temperature-dependent performance of PSA-STT-MRAMs. In this work, we summarize and discuss various possible temperature-dependent contributions to the thermal stability factor and coercivity of the PSA-STT-MRAMs by modeling and comparing different temperature scaling and parameters. We reveal nontrivial corrections to the thermal stability factor by considering both temperature-dependent shape and interfacial anisotropies. The coercivity, blocking temperature, and electrical switching characteristics that resulted from incorporating such a temperature dependence are also discussed, in conjugation with the nanomagnet dimension and coherence volume. © 2021 Author(s).
Note12 month embargo; published online: 08 June 2021
VersionFinal published version