# Spin and orbit torques in artificial alloy thin films and heterostructures

https://mdr.nims.go.jp/datasets/b8b48d24-1025-43fb-9cd3-39083caabba6

## File

- [MSJ2024 abstract-Wen-1.pdf](https://mdr.nims.go.jp/filesets/a7a78074-f7b7-4c21-a9a1-6d33426011a6/download) ([Detail](https://mdr.nims.go.jp/filesets/a7a78074-f7b7-4c21-a9a1-6d33426011a6.md))

## Id

b8b48d24-1025-43fb-9cd3-39083caabba6

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-28T06:39:50.114306Z

## Updated at

2024-12-03T07:31:01.419488Z

## Published at

2024-12-03T07:31:01.513884Z

## Doi

https://doi.org/10.48505/nims.5079

## First published url



## Date published



## Recorded date published



## Resource type

conference_presentation

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Spin and orbit torques in artificial alloy thin films and heterostructures
  title_type: original
  lang: en

## Description

- description: "In this talk, we present enhanced spin and orbital torque efficiencies
    in well-engineered artificial heterostructures and alloy thin films, including
    topological insulator BiSb/Ti/NiFe heterostructures and nonequilibrium RuMo alloy
    thin films. \r\n We investigated the effect of the Ti insertion layer on the torque
    efficiency of two series of samples, BiSb/NiFe and BiSb/Ti/NiFe, under as-deposited,
    room-temperature aging and annealing conditions. Samples with the Ti layer showed
    a multifold increase in torque efficiency compared to those without Ti insertion.
    Atomic resolution microstructural analysis clearly illustrates the interfacial
    chemistry where Ti effectively prevents the interdiffusion of Ni and Sb. This
    interfacial chemistry near Ti at the interface of BiSb/NiFe significantly enhances
    torque efficiency. On the other hand, epitaxial thin films of fully nonequilibrium
    hcp-Ru50Mo50(0001) nanoalloys were prepared as chemically disordered alloys with
    an expected negligible intrinsic SHE. Structural analysis confirmed epitaxial
    growth and atomic-scale alloying of the thin films. Unlike the modest torque efficiency
    (~0.4%) observed for Ru50Mo50/CoFeB, the torque efficiency for the Ru50Mo50/Ni
    bilayers reached approximately 30% with a long-range relaxation length. The observed
    large variation in torque efficiency with the ferromagnetic layer could be attributed
    to the OHE. Interestingly, a small torque efficiency was observed for Ru/Ni, indicating
    that the nonequilibrium Ru50Mo50 composition enhances the OHE. Furthermore, inserting
    a Ru layer between the Ru50Mo50 and Ni layers maintains and improves torque efficiency,
    indicating orbital transport through Ru. These results not only show the significance
    of artificially engineered heterostructures and nanoalloy thin films for potential
    applications in spin and orbital torque technologies., but also contribute to
    the understanding of the intricate relationships between nanostructures and spin-orbitronics. "
  description_type: abstract
  lang: eng

## Creator

- name: Zhenchao Wen
  role: author
  orcid: https://orcid.org/0000-0001-7496-1339
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Spintronics Group
- name: Tadakatsu Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Nanostructure
    Analysis Group
- name: Hiroaki Sukegawa
  role: author
  orcid: https://orcid.org/0000-0002-4034-7848
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials/Spintronics Group
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
  organization: National Institute for Materials Science
  department: Research Center for Magnetic and Spintronic Materials

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## Keyword

- subject: Spin-Orbit Torques
  schema: not_defined
- subject: Artificial alloy thin films
  schema: not_defined

## Rights

- description: "©公益社団法人 日本磁気学会 (The Magnetics Society of Japan)"
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-09-27
end_date: 2024-10-27

## Journal



## Conference

name: 第48回日本磁気学会学術講演会
start_date: 2024-09-24
end_date: 2024-09-27
identifier: https://www.magnetics.jp/kouenkai/2024/

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## Fileset

- id: a7a78074-f7b7-4c21-a9a1-6d33426011a6
  filename: MSJ2024 abstract-Wen-1.pdf
  content_type: application/pdf
  size: 284496
  md5: d92baaca812780ae143cec708ba3777d

## Thumbnail

fileset_id: a7a78074-f7b7-4c21-a9a1-6d33426011a6
filename: MSJ2024 abstract-Wen-1.pdf