Giant magnetoresistance effect due to interface resonant tunneling in (111) oriented MTJs

Magnetic tunnel junctions (MTJs) have a structure in which an insulator is sandwiched between ferromagnetic materials and are used in various magnetic sensors and next-generation nonvolatile memories. Theoretical proposal of novel MTJs with better properties is one of our important research themes. Recently, we have studied (111) oriented MTJs [Figure (b)], which have a different structure from conventional (001) oriented MTJs [Figure (a)], and found that a very large magnetoresistance ratio can be obtained (Masuda et al., 2020; Masuda et al., 2021). We have also found that this giant magnetoresistance ratio is caused by a new mechanism called interfacial resonance tunneling. Further experimental and theoretical studies on such novel (111) oriented MTJs are expected in the future.

References

2021

Interfacial giant tunnel magnetoresistance and bulk-induced large perpendicular magnetic anisotropy in (111)-oriented junctions with fcc ferromagnetic alloys: A first-principles study

Keisuke Masuda, Hiroyoshi Itoh , Yoshiaki Sonobe , Hiroaki Sukegawa , Seiji Mitani , and Yoshio Miura

Phys. Rev. B, Feb 2021

DOI Bib

@article{Masuda2021-tg,
  title = {Interfacial giant tunnel magnetoresistance and bulk-induced
                 large perpendicular magnetic anisotropy in (111)-oriented
                 junctions with fcc ferromagnetic alloys: A first-principles
                 study},
  author = {Masuda, Keisuke and Itoh, Hiroyoshi and Sonobe, Yoshiaki and Sukegawa, Hiroaki and Mitani, Seiji and Miura, Yoshio},
  journal = {Phys. Rev. B},
  publisher = {American Physical Society,},
  volume = {103},
  number = {6},
  pages = {064427},
  month = feb,
  year = {2021},
  issn = {0163-1829},
  doi = {10.1103/PhysRevB.103.064427},
}

2020

Interface-driven giant tunnel magnetoresistance in (111)-oriented junctions

Keisuke Masuda, Hiroyoshi Itoh , and Yoshio Miura

Phys. Rev. B, Apr 2020

DOI Bib

@article{Masuda2020-vh,
  title = {Interface-driven giant tunnel magnetoresistance in
                 (111)-oriented junctions},
  author = {Masuda, Keisuke and Itoh, Hiroyoshi and Miura, Yoshio},
  journal = {Phys. Rev. B},
  publisher = {American Physical Society,},
  volume = {101},
  number = {14},
  pages = {144404},
  month = apr,
  year = {2020},
  issn = {0163-1829},
  doi = {10.1103/PhysRevB.101.144404},
}