Microscopic Modeling of MgO Barrier Degradation Due to Interface Oxygen Frenkel Defects in Scaled MTJ Toward High-Density STT-MRAM
Spin-transfer torque magnetic random-access memory (STT-MRAM) is a promising candidate for high-density storage-class memories by using magnetic tunnel junctions (MTJs) with small diameters. However, it is reported that reducing the MTJ diameter can result in resistance drift and degradation of tunn...
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Published in | 2024 IEEE International Reliability Physics Symposium (IRPS) pp. P10.EM-1 - P10.EM-5 |
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Main Authors | , , , , , , , , , , , , |
Format | Conference Proceeding |
Language | English |
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IEEE
14.04.2024
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Abstract | Spin-transfer torque magnetic random-access memory (STT-MRAM) is a promising candidate for high-density storage-class memories by using magnetic tunnel junctions (MTJs) with small diameters. However, it is reported that reducing the MTJ diameter can result in resistance drift and degradation of tunnel magnetoresistance (TMR) ratios, which can lead to readout errors. In this study, we investigated the mechanism of the time-dependent degradation of MgO barrier and proposed a method to suppress it. Resistance drift and degradation of TMR ratio were experimentally observed in scaled MTJs under a voltage stress. The degradation can be explained by the current-induced generation of oxygen Frenkel defects at the Fe-MgO interface using microscopic calculations. The reduction of the initial oxygen vacancies in MgO can suppress degradation. Our findings elucidated on the improved reliability in high-density STT-MRAM for storage class memory applications. |
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AbstractList | Spin-transfer torque magnetic random-access memory (STT-MRAM) is a promising candidate for high-density storage-class memories by using magnetic tunnel junctions (MTJs) with small diameters. However, it is reported that reducing the MTJ diameter can result in resistance drift and degradation of tunnel magnetoresistance (TMR) ratios, which can lead to readout errors. In this study, we investigated the mechanism of the time-dependent degradation of MgO barrier and proposed a method to suppress it. Resistance drift and degradation of TMR ratio were experimentally observed in scaled MTJs under a voltage stress. The degradation can be explained by the current-induced generation of oxygen Frenkel defects at the Fe-MgO interface using microscopic calculations. The reduction of the initial oxygen vacancies in MgO can suppress degradation. Our findings elucidated on the improved reliability in high-density STT-MRAM for storage class memory applications. |
Author | Kanaya, Hiroyuki Toko, Masaru Itai, Shogo Watanabe, Daisuke Sugiyama, Hideyuki Koike, Takeo Oikawa, Soichi Takashima, Rina Lee, Young Min Ono, Soichiro Nakayama, Masahiko Nakamura, Kohji Koi, Katsuhiko |
Author_xml | – sequence: 1 givenname: Rina surname: Takashima fullname: Takashima, Rina email: rina1.takashima@kioxia.com organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 2 givenname: Takeo surname: Koike fullname: Koike, Takeo organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 3 givenname: Shogo surname: Itai fullname: Itai, Shogo organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 4 givenname: Hideyuki surname: Sugiyama fullname: Sugiyama, Hideyuki organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 5 givenname: Young Min surname: Lee fullname: Lee, Young Min organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 6 givenname: Masaru surname: Toko fullname: Toko, Masaru organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 7 givenname: Soichiro surname: Ono fullname: Ono, Soichiro organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 8 givenname: Daisuke surname: Watanabe fullname: Watanabe, Daisuke organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 9 givenname: Soichi surname: Oikawa fullname: Oikawa, Soichi organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 10 givenname: Katsuhiko surname: Koi fullname: Koi, Katsuhiko organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 11 givenname: Hiroyuki surname: Kanaya fullname: Kanaya, Hiroyuki organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 12 givenname: Masahiko surname: Nakayama fullname: Nakayama, Masahiko organization: Institute of Memory Technology R&D, Kioxia Corporation,Yokohama,Japan – sequence: 13 givenname: Kohji surname: Nakamura fullname: Nakamura, Kohji organization: Graduate School of Engineering, Mie University,Tsu,Japan |
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Snippet | Spin-transfer torque magnetic random-access memory (STT-MRAM) is a promising candidate for high-density storage-class memories by using magnetic tunnel... |
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SubjectTerms | Degradation Microscopy oxygen defects Reliability theory Resistance STT-MRAM time-dependent degradation Torque Tunneling magnetoresistance Voltage |
Title | Microscopic Modeling of MgO Barrier Degradation Due to Interface Oxygen Frenkel Defects in Scaled MTJ Toward High-Density STT-MRAM |
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