Coherent magnetization reversal of a cylindrical nanomagnet in shape-anisotropy magnetic tunnel junctions

Butsurin Jinnai, Junta Igarashi, Kyota Watanabe, Eli Christopher I. Enobio, Shunsuke Fukami, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

Abstract

A shape-anisotropy magnetic tunnel junction (MTJ) holds promise for its scaling into single-digit nanometers while possessing high data-retention capability. Understanding magnetization reversal mode is crucial to quantify the thermal stability factor Δfor data retention with high accuracy. Here, we study magnetization reversal mode in the shape-anisotropy MTJ with a 15-nm-thick CoFeB layer by evaluating Δfrom two different methods: switching probability and retention time measurements. We find that magnetization reversal coherently proceeds in the 15-nm-thick and X/1X-nm-diameter cylindrical nanomagnet in the shape-anisotropy MTJs, in contrast to the conventional interfacial-anisotropy MTJs with a smaller thickness and larger diameter. The coherent magnetization reversal of the shape-anisotropy MTJ is also confirmed by astroid curve measurements. This study provides insight into the development of ultrasmall and high-reliability MTJ devices.

Original languageEnglish
Article number082404
JournalApplied Physics Letters
Volume118
Issue number8
DOIs
Publication statusPublished - 2021 Feb 22

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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