Dependence of sub-volume excitation on structural and material parameters in precessional regime of spin transfer torque magnetization reversal

Kenchi Ito, Satoshi Ohuchida, Tetsuo Endoh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We studied the structural and material parameter dependence of sub-volume excitation in a precessional regime of spin transfer torque (STT) magnetization reversal for CoFeB/MgO-based p-magnetic tunnel junctions (MTJs) using LLG micromagnetic simulation. The current density dependence of swiTChing and incubation time in STT magnetization reversal can be globally scaled by the macrospin theory regardless of sub-volume excitation. The transit time has the minimum value at the minimum MTJ diameter where the sub-volume is excited. This critical diameter increases with an increase in exchange stiffness. The mechanism that sub-volume excitation is related to current density is also discussed.

Original languageEnglish
Article number6971585
JournalIEEE Transactions on Magnetics
Volume50
Issue number11
DOIs
Publication statusPublished - 2014 Nov 1

Keywords

  • Magnetic tunnel junction (MTJ)
  • magnetization dynamics
  • micromagnetic simulation
  • spin transfer torque (STT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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