TY - JOUR
T1 - Fast neutron tolerance of the perpendicular-anisotropy CoFeB-MgO magnetic tunnel junctions with junction diameters between 46 and 64nm
AU - Narita, Yuzuru
AU - Takahashi, Yutaka
AU - Harada, Masahide
AU - Oikawa, Kenichi
AU - Kobayashi, Daisuke
AU - Hirose, Kazuyuki
AU - Sato, Hideo
AU - Ikeda, Shoji
AU - Endoh, Tetsuo
AU - Ohno, Hideo
N1 - Publisher Copyright:
© 2017 The Japan Society of Applied Physics.
PY - 2017/8
Y1 - 2017/8
N2 - 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.
AB - 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.
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U2 - 10.7567/JJAP.56.0802B3
DO - 10.7567/JJAP.56.0802B3
M3 - Article
AN - SCOPUS:85026474502
VL - 56
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 8
M1 - 0802B3
ER -