Perpendicular magnetic tunnel junctions with multi-interface free layer

Pravin Khanal; Bowei Zhou; Magda Andrade; Yanliu Dang; Albert Davydov; Ali Habiboglu; Jonah Saidian; Adam Laurie; Jian-Ping Wang; Daniel B Gopman; Weigang Wang

doi:10.1063/5.0066782

Perpendicular magnetic tunnel junctions with multi-interface free layer

Materials Science 2022-01-12 v1

Authors: Pravin Khanal , Bowei Zhou , Magda Andrade , Yanliu Dang , Albert Davydov , Ali Habiboglu , Jonah Saidian , Adam Laurie , Jian-Ping Wang , Daniel B Gopman , Weigang Wang

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Abstract

Future generations of magnetic random access memory demand magnetic tunnel junctions that can provide simultaneously high magnetoresistance, strong retention, low switching energy and small cell size below 10nm. Here we study perpendicular magnetic tunnel junctions with composite free layers where multiple ferromagnet/nonmagnet interfaces can contribute to the thermal stability. Different nonmagnetic materials (MgO, Ta, Mo) have been employed as the coupling layers in these multi-interface free layers. The evolution of junction properties under different annealing conditions is investigated. A strong dependence of tunneling magnetoresistance on the thickness of the first CoFeB layer has been observed. In junctions where Mo and MgO are used as coupling layers, large tunneling magnetoresistance above 200% has been achieved after 400{\deg}C annealing.

Keywords

magnetic tunnel junctions magnetoresistance magnetocaloric effect

Cite

@article{arxiv.2201.03798,
  title  = {Perpendicular magnetic tunnel junctions with multi-interface free layer},
  author = {Pravin Khanal and Bowei Zhou and Magda Andrade and Yanliu Dang and Albert Davydov and Ali Habiboglu and Jonah Saidian and Adam Laurie and Jian-Ping Wang and Daniel B Gopman and Weigang Wang},
  journal= {arXiv preprint arXiv:2201.03798},
  year   = {2022}
}

Perpendicular magnetic tunnel junctions with multi-interface free layer

Abstract

Keywords

Cite

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