# Thickness dependent spin to charge interconversion efficiency in polycrystalline BiSb layers deposited on Si substrate

https://mdr.nims.go.jp/datasets/c21d1362-ada3-4ccc-965b-484ba56d7f07

## File

- [Manuscript_02072025_JAP.pdf](https://mdr.nims.go.jp/filesets/4b248662-1483-4bd4-83fd-ea23c1ba99ff/download) ([Detail](https://mdr.nims.go.jp/filesets/4b248662-1483-4bd4-83fd-ea23c1ba99ff.md))
- [SUPPLEMENTARY MATERIAL.pdf](https://mdr.nims.go.jp/filesets/da547f43-2554-4cb5-aa8b-428f08f64ab1/download) ([Detail](https://mdr.nims.go.jp/filesets/da547f43-2554-4cb5-aa8b-428f08f64ab1.md))

## Id

c21d1362-ada3-4ccc-965b-484ba56d7f07

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-09-09T08:27:02.963802Z

## Updated at

2025-09-10T07:30:20.073300Z

## Published at

2025-09-10T07:19:36.040166Z

## Doi

https://doi.org/10.48505/nims.5745

## First published url

https://doi.org/10.1063/5.0280905

## Date published

2025-08-07

## Recorded date published

2025-8-7

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Thickness dependent spin to charge interconversion efficiency in polycrystalline
    BiSb layers deposited on Si substrate
  title_type: original
  lang: en

## Description

- description: The strong spin-orbit torque (SOT) generated by topological insulators
    (TIs) interfaced with ferromagnetic layers paves the path towards high-performance
    and low-power spintronic device applications. To date, large spin-to-charge or
    charge-to-spin conversion efficiency (ξ) of TIs is accomplished on high-quality
    epitaxially grown TI thin films on specifically oriented substrates. Moreover,
    the emergence of topological surface states (TSS) largely depends on the composition,
    which is hard to obtain on a large scale using sputtering growth. Here, we report
    a room-temperature ξ of BiSb/Py bilayer thin films with Titanium insertion (Ti)
    grown on Si substrates, which underlines the potential of BiSb for industrial
    applications and its adaptability to industrial-friendly processes. In this work,
    spin pumping and inverse spin Hall effect (ISHE) studies are performed on magnetron-sputtered
    BiSb(x)/Ti(x)/Py(10 nm) stacks by varying the thicknesses of BiSb and Ti insertion.
    The ξ has improved from 8 nm to 12 nm of BiSb in BiSb(x)/Ti(3 nm)/Py(10 nm) samples,
    and we found ξ of 3.71 in the BiSb(12 nm)/Ti(3 nm)/Py(10 nm) sample. This increasing
    trend in ξ with the thickness of BiSb is also consistently observed in spin-torque
    ferromagnetic resonance (ST-FMR) measurements. However, a decreasing trend in
    ξ was noted with the insertion layer thickness increased to 4 and 8 nm, underscoring
    the critical role of spacer layer thickness in determining ξ. Our results demonstrate
    the process involved in depositing a homogeneous BiSb layer directly on the Si
    substrate and the impact of the thickness of the insertion layer and BiSb on the
    ξ in topological material/ferromagnet bilayer systems. The relatively high ξ in
    TI grown on Si substrate paves the way for the development of low-power, high-speed
    CMOS-compatible novel spin-orbit torque devices.
  description_type: abstract
  lang: und

## Creator

- name: Talluri Manoj
  role: author
- name: Venkat Mattela
  role: author
- name: Akshay Kumar Salimath
  role: author
- name: Sanghamitra Debroy
  role: author
- name: Tarun Raju Kakinada
  role: author
  orcid: https://orcid.org/0009-0002-7136-2300
- name: M. S. Devapriya
  role: author
  orcid: https://orcid.org/0009-0004-2754-9383
- name: Arabinda Haldar
  role: author
  orcid: https://orcid.org/0000-0002-0490-9719
- name: Zhenchao Wen
  role: author
  orcid: https://orcid.org/0000-0001-7496-1339
- name: Hiroaki Sukegawa
  role: author
  orcid: https://orcid.org/0000-0002-4034-7848
- name: Seiji Mitani
  role: author
  orcid: https://orcid.org/0000-0002-1348-0774
- name: Chandrasekhar Murapaka
  role: author
  orcid: https://orcid.org/0000-0002-0283-7037

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: Spin-charge interconversion
  schema: not_defined
- subject: Polycrystalline BiSb
  schema: not_defined
- subject: Thickness dependence
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Applied Physics
  issn: '00218979'
  volume: '138'
  issue: '5'
  article_number: '053903'

## Conference



## Related item



## Funding

- identifier: AC2023-7
  funder_name: JICA Friendship

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 4b248662-1483-4bd4-83fd-ea23c1ba99ff
  filename: Manuscript_02072025_JAP.pdf
  content_type: application/pdf
  size: 2299514
  md5: 3e81119235e26d483f52bf8025791e3c
- id: da547f43-2554-4cb5-aa8b-428f08f64ab1
  filename: SUPPLEMENTARY MATERIAL.pdf
  content_type: application/pdf
  size: 1049671
  md5: 0b1e2fedddc309e955dd3558fb1fc9fd

## Thumbnail

fileset_id: 4b248662-1483-4bd4-83fd-ea23c1ba99ff
filename: Manuscript_02072025_JAP.pdf