# Reversal of Spin‐Torque Polarity with Inverting Current Vorticity in Composition‐Graded Layer at the Ti/W Interface

https://mdr.nims.go.jp/datasets/1ec0015f-1fb6-42bd-9ac0-3fed21dc8a74

## File

- [Reversal of Spin-torque Polarity with Inverting Current Vorticity in Composition-graded Layer at the Ti-W Interface.pdf](https://mdr.nims.go.jp/filesets/70e53ff1-b58c-423a-8cdd-0635d909e547/download) ([Detail](https://mdr.nims.go.jp/filesets/70e53ff1-b58c-423a-8cdd-0635d909e547.md))

## Id

1ec0015f-1fb6-42bd-9ac0-3fed21dc8a74

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-05-15T06:30:49.029935Z

## Updated at

2025-05-16T03:30:14.781688Z

## Published at

2025-05-16T03:19:03.155539Z

## Doi

https://doi.org/10.48505/nims.5479

## First published url

https://doi.org/10.1002/aelm.202400797

## Date published

2025-04-08

## Recorded date published

2025-5

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Reversal of Spin‐Torque Polarity with Inverting Current Vorticity in Composition‐Graded
    Layer at the Ti/W Interface
  title_type: original
  lang: en

## Description

- description: While compositional gradient-induced spin-current generation is explored,
    its microscopic mechanisms remain poorly understood. Here, the contribution of
    polarity of compositional gradient on spin-current generation is explored. A nanoscale
    compositional gradient, formed by in situ atomic diffusion of ultrathin Ti and
    W layers, is introduced between 10-nm-thick W and Ti layers. Spin-torque ferromagnetic
    resonance in ferromagnetic Ni95Cu5 deposited on this gradient reveals that a moderate
    compositional gradient suppresses negative spin torque from the spin Hall effect
    in W. In contrast, reversing the Ti/W stacking order, which inverts the gradient,
    suppresses positive spin torque from the orbital Hall effect in Ti. These findings
    suggest that the sign of spin torque is governed by the polarity of compositional
    gradient, providing a novel strategy for efficient spin-torque generation without
    relying on materials with strong spin or orbital Hall effect.
  description_type: abstract
  lang: und

## Creator

- name: Hayato Nakayama
  role: author
  orcid: https://orcid.org/0009-0006-0510-2454
- name: Taisuke Horaguchi
  role: author
  orcid: https://orcid.org/0009-0000-7435-6075
- name: Jun Uzuhashi
  role: author
  orcid: https://orcid.org/0000-0003-2023-8158
- name: Cong He
  role: author
  orcid: https://orcid.org/0000-0002-7548-9344
- name: Hiroaki Sukegawa
  role: author
  orcid: https://orcid.org/0000-0002-4034-7848
- name: Tadakatsu Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
- name: Kazuto Yamanoi
  role: author
  orcid: https://orcid.org/0000-0001-5356-0712
- name: Yukio Nozaki
  role: author
  orcid: https://orcid.org/0000-0002-7262-0124

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: spintronics
  schema: not_defined
- subject: spin vorticity coupling
  schema: not_defined
- subject: spin torque
  schema: not_defined
- subject: compositional gradient
  schema: not_defined
- subject: transmission electron microscopy
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Advanced Electronic Materials
  issn: 2199160X

## Conference



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## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 70e53ff1-b58c-423a-8cdd-0635d909e547
  filename: Reversal of Spin-torque Polarity with Inverting Current Vorticity in Composition-graded
    Layer at the Ti-W Interface.pdf
  content_type: application/pdf
  size: 1828750
  md5: b2582fce0d028d154a3fbdbe325209eb

## Thumbnail

fileset_id: 70e53ff1-b58c-423a-8cdd-0635d909e547
filename: Reversal of Spin-torque Polarity with Inverting Current Vorticity in Composition-graded
  Layer at the Ti-W Interface.pdf