# High entropy oxide epitaxial films with interface perpendicular magnetic anisotropy and tunnel magnetoresistance effect toward spintronic applications

https://mdr.nims.go.jp/datasets/94891a39-3524-441d-8cdd-5866a81d9d73

## File

- [1-s2.0-S1369702125002640-main.pdf](https://mdr.nims.go.jp/filesets/d6ca9c6e-8455-4ffc-aea5-c600961199e7/download) ([Detail](https://mdr.nims.go.jp/filesets/d6ca9c6e-8455-4ffc-aea5-c600961199e7.md))

## Id

94891a39-3524-441d-8cdd-5866a81d9d73

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-02T01:24:49.154523Z

## Updated at

2025-09-02T07:30:19.699729Z

## Published at

2025-09-02T03:25:00.388653Z

## Doi



## First published url

https://doi.org/10.1016/j.mattod.2025.06.025

## Date published

2025-07-05

## Recorded date published

2025-9

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: High entropy oxide epitaxial films with interface perpendicular magnetic
    anisotropy and tunnel magnetoresistance effect toward spintronic applications
  title_type: original
  lang: en

## Description

- description: In this study, we explored the HEO thin films with a rock-salt-like
    structure of LiTiMgAlGaO for perpendicular magnetic anisotropy (PMA), which is
    induced at an interface with the CoFeB ferromagnet. The atomically homogeneous
    cation distributions in the 10-20 nm thick LiTiMgAlGaO films were achieved by
    atomic sputtering lamination on a MgO(001) single crystal substrate. The films
    were grown with a highly (001)-oriented epitaxial growth and have an atomically
    flat surface with an average roughness of 0.07 nm. We observed perpendicular magnetization
    of CoFeB on the LiTiMgAlGaO layer after 250-350C post-annealing, revealing that
    introduction of significantly large PMA at HEO/ferromagnet interfaces. A large
    interface PMA energy of up to ~0.8 erg/cm2 at the interface was observed due to
    the achievement of structurally stable epitaxial layers with high crystallinity
    and sharp interfacial flatness of L5O and CFB interfaces. We also demonstrated
    that a tunnel magnetoresistance (TMR) ratio of up to 84% at room temperature in
    epitaxial Fe/L5O/Fe(001) magnetic tunnel junctions (MTJs) with ultrathin MgO insertions
    at the L5O interfaces, indicating that the spin-dependent coherent tunneling mechanism
    is also observed in HEO-based MTJs. In addition, the L5O barrier exhibits low
    barrier heights less than 1 eV due to the bandgap reduction caused by the five
    cations. Our results of the high interface PMA energy, the relatively large TMR
    ratio, and the low barrier height show that the HEO materials can be a promising
    material family of ultra-thin barriers of MTJs for the next generation of high-density
    spintronic devices such as ultra-high-density memory and spin artificial intelligence
    devices.
  description_type: abstract
  lang: und

## Creator

- name: Rombang Rizky Sihombing
  role: author
  orcid: https://orcid.org/0000-0002-8461-7352
- name: Thomas Scheike
  role: author
  orcid: https://orcid.org/0000-0002-9163-5524
- name: Jun Uzuhashi
  role: author
  orcid: https://orcid.org/0000-0003-2023-8158
- name: Hideyuki Yasufuku
  role: author
  orcid: https://orcid.org/0000-0001-5600-8958
- name: Tadakatsu Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
- name: Zhenchao Wen
  role: author
  orcid: https://orcid.org/0000-0001-7496-1339
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
- name: Hiroaki Sukegawa
  role: author
  orcid: https://orcid.org/0000-0002-4034-7848

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: High entropy oxides
  schema: not_defined
- subject: Epitaxial growth
  schema: not_defined
- subject: Spintronics
  schema: not_defined
- subject: Perpendicular magnetization
  schema: not_defined
- subject: Tunnel magnetoresistance
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Materials Today
  issn: '13697021'
  volume: '88'
  start_page: 12
  end_page: 23

## Conference



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## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Fileset

- id: d6ca9c6e-8455-4ffc-aea5-c600961199e7
  filename: 1-s2.0-S1369702125002640-main.pdf
  content_type: application/pdf
  size: 13376102
  md5: 38da36eb42121cb3c02a0f4313dbfd23

## Thumbnail

fileset_id: d6ca9c6e-8455-4ffc-aea5-c600961199e7
filename: 1-s2.0-S1369702125002640-main.pdf