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

https://mdr.nims.go.jp/datasets/0bfb2625-a374-43b1-bdb6-45b5218d0e91

## File

- [PhysRevB.103.064427.pdf](https://mdr.nims.go.jp/filesets/7acacb86-c208-4d18-8178-fdd034dedacd/download) ([Detail](https://mdr.nims.go.jp/filesets/7acacb86-c208-4d18-8178-fdd034dedacd.md))

## Id

0bfb2625-a374-43b1-bdb6-45b5218d0e91

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-04-10T01:19:27.449347Z

## Updated at

2024-04-11T07:30:23.396770Z

## Published at

2024-04-11T07:30:23.466205Z

## Doi



## First published url

https://doi.org/10.1103/physrevb.103.064427

## Date published

2021-02-22

## Recorded date published

2021-2

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

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

## Description

- description: We study the tunnel magnetoresistance (TMR) effect and magnetocrystalline
    anisotropy in a series of magnetic tunnel junctions (MTJs) with L11-ordered fcc
    ferromagnetic alloys and MgO barrier along the [111] direction. Considering the
    (111)-oriented MTJs with different L11alloys, we calculate their TMR ratios and
    magnetocrystalline anisotropies on the basis of the first-principles calculations.
    The analysis shows that the MTJs with Co-based alloys (CoNi, CoPt, and CoPd) have
    high TMR ratios over 2000%. These MTJs have energetically favored Co-O interfaces
    where interfacial antibonding between Co d and O p states is formed around the
    Fermi level.  We find that the resonant tunneling of the antibonding states, called
    the interface resonant tunneling, is the origin of the obtained high TMR ratios.
    Such a mechanism is similar to that found in our recent work on the simple Co/MgO/Co(111)
    MTJ [K. Masuda et al., Phys. Rev. B 101, 144404 (2020)]. In contrast, different
    systems have different spin channels where the interface resonant tunneling occurs;
    for example, the tunneling mainly occurs in the majority-spin channel in the CoNi-based
    MTJ while it occurs in the minority-spin channel in the CoPt-based MTJ. This means
    that even though the mechanism is similar, different spin channels contribute
    dominantly to the high TMR ratio in different systems. Such a difference is attributed
    to the different exchange splittings in the particular Co d states contributing
    to the tunneling though the antibonding with O p states.  Our calculation of the
    magnetocrystalline anisotropy shows that many L11 alloys have large perpendicular
    magnetic anisotropy (PMA). In particular, CoPt has the largest value of anisotropy
    energy Ku≈10 MJ/m3.  We further conduct a perturbation analysis of the PMA with
    respect to the spin-orbit interaction and reveal that the large PMA in CoPt and
    CoNi mainly originates from spin-conserving perturbation processes around the
    Fermi level.
  description_type: abstract
  lang: und

## Creator

- name: Keisuke Masuda
  role: author
  orcid: https://orcid.org/0000-0002-6884-6390
  organization: National Institute for Materials Science
- name: Hiroyoshi Itoh
  role: author
- name: Yoshiaki Sonobe
  role: author
- name: Hiroaki Sukegawa
  role: author
  orcid: https://orcid.org/0000-0002-4034-7848
  organization: National Institute for Materials Science
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
  organization: National Institute for Materials Science
- name: Yoshio Miura
  role: author
  orcid: https://orcid.org/0000-0002-5605-5452
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Tunnel magnetoresistance
  schema: not_defined
- subject: Magnetic anisotropy
  schema: not_defined
- subject: Magnetic tunnel junction
  schema: not_defined
- subject: Spintronics
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review B
  issn: 1550235X
  volume: '103'
  issue: '6'
  article_number: '064427'

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## Related item



## Funding

- identifier: JP16H06332
  funder_name: Japan Society for the Promotion of Science
- identifier: JP17H06152
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20H02190
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20K14782
  funder_name: Japan Society for the Promotion of Science

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## Fileset

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  filename: PhysRevB.103.064427.pdf
  content_type: application/pdf
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  md5: c0abbf9dfaeb52524909aeee9e1dbaac

## Thumbnail

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filename: PhysRevB.103.064427.pdf