On the temperature-dependent characteristics of perpendicular shape anisotropy-spin transfer torque-magnetic random access memories

Wei Zhang, Zihan Tong, Yuzan Xiong, Weigang Wang, Qiming Shao

Research output: Contribution to journalArticlepeer-review

Abstract

The 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.

Original languageEnglish (US)
Article number223903
JournalJournal of Applied Physics
Volume129
Issue number22
DOIs
StatePublished - Jun 14 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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