Fast neutron tolerance of the perpendicular-anisotropy CoFeB-MgO magnetic tunnel junctions with junction diameters between 46 and 64nm

Yuzuru Narita, Yutaka Takahashi, Masahide Harada, Kenichi Oikawa, Daisuke Kobayashi, Kazuyuki Hirose, Hideo Sato, Shoji Ikeda, Tetsuo Endoh, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This work represents the first-ever investigation of the effects of fast neutron exposure on the perpendicular-anisotropy CoFeB-MgO magnetic tunnel junctions (p-MTJs) with practical junction diameters (D) between 46 and 64 nm. In this study, 461 p-MTJs, each with a tunnel magnetoresistance (TMR) ratio above 90%, were irradiated with fast neutrons at a total 1MeV equivalent fluence of 3.79 ' 1012cm%2, corresponding to 1.90 ' 1011 h irradiation with fast atmospheric neutrons (20cm%2 h%1), without applying a bias voltage. Following irradiation, there were no changes in the properties of these devices, such as their resistance versus magnetic field curves, resistance values in the parallel and anti-parallel states, or TMR ratios, regardless of the neutron fluence. On the basis of these data, the nuclear reactions that occur under the specific experimental neutron irradiation conditions employed in this work are discussed.

Original languageEnglish
Article number0802B3
JournalJapanese journal of applied physics
Volume56
Issue number8
DOIs
Publication statusPublished - 2017 Aug

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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