# Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

https://mdr.nims.go.jp/datasets/4c25b79e-2757-48ce-b58b-76dc3767e351

## File

- [AHE reader MDR.pdf](https://mdr.nims.go.jp/filesets/568f4f25-4708-4836-a64d-d1064b7f1b7c/download) ([Detail](https://mdr.nims.go.jp/filesets/568f4f25-4708-4836-a64d-d1064b7f1b7c.md))
- [Supplementary_material_AHEreader.pdf](https://mdr.nims.go.jp/filesets/2bb8cfe8-a9c0-425e-b375-a913b75fed9c/download) ([Detail](https://mdr.nims.go.jp/filesets/2bb8cfe8-a9c0-425e-b375-a913b75fed9c.md))

## Id

4c25b79e-2757-48ce-b58b-76dc3767e351

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-02-22T12:17:07.669454Z

## Updated at

2024-02-26T03:30:23.948683Z

## Published at

2024-02-26T03:30:24.029418Z

## Doi

https://doi.org/10.48505/nims.4408

## First published url

https://doi.org/10.1063/5.0191974

## Date published

2024-02-12

## Recorded date published

2024-2-12

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Perspective on nanoscale magnetic sensors using giant anomalous Hall effect
    in topological magnetic materials for read head application in magnetic recording
  title_type: original
  lang: en

## Description

- description: 'Recent advances in the study of materials with topological electronic
    band structures have revealed magnetic materials exhibiting giant anomalous Hall
    effects (AHE). The giant AHE has not only attracted the research interest in its
    mechanism but also opened up the possibility of practical application in magnetic
    sensors. In this article, we describe simulation-based investigations of AHE magnetic
    sensors for the applications to read head sensors (readers) of hard disk drives.
    With the shrinking of magnetic recording patterns, the reader technology, which
    currently uses multilayer-based tunnel magnetoresistance (TMR) devices, is associated
    with fundamental challenges, such as insufficient spatial resolution and signal-to-noise
    ratio (SNR) in sensors with dimensions below 20 nm. The structure of an AHE-based
    device composed of a single ferromagnetic material is advantageous for magnetic
    sensors with nanoscale dimensions. We found that AHE readers using topological
    ferromagnets with giant AHE, such as Co2MnGa, can achieve a higher SNR than current
    TMR readers. The higher SNR originates from the large output signal of the giant
    AHE as well as from the reduced thermal magnetic noise, which is the dominant
    noise in TMR readers. We highlight a major challenge in the development of AHE
    readers: the reduction in the output signal due to the shunting of the bias current
    and the leakage of the Hall voltage through the soft magnetic shields surrounding
    the AHE reader. We propose reader structures that overcome this challenge. Finally,
    we discuss the scope for future research to realize AHE readers.'
  description_type: abstract
  lang: und

## Creator

- name: Tomoya Nakatani
  role: author
  orcid: https://orcid.org/0000-0001-9590-216X
  organization: National Institute for Materials Science
- name: Prabhanjan D. Kulkarni
  role: author
  orcid: https://orcid.org/0000-0002-4605-5256
  organization: National Institute for Materials Science
- name: Hirofumi Suto
  role: author
  orcid: https://orcid.org/0000-0003-4387-5862
  organization: National Institute for Materials Science
- name: Keisuke Masuda
  role: author
  orcid: https://orcid.org/0000-0002-6884-6390
  organization: National Institute for Materials Science
- name: Hitoshi Iwasaki
  role: author
  organization: National Institute for Materials Science
- name: Yuya Sakuraba
  role: author
  orcid: https://orcid.org/0000-0003-4618-9550
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: anomalous Hall effect
  schema: not_defined
- subject: topological materials
  schema: not_defined
- subject: Weyl semimetal
  schema: not_defined
- subject: magnetic sensors
  schema: not_defined
- subject: read head
  schema: not_defined
- subject: magnetic recording
  schema: not_defined

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## Embargo



## Journal

- title: Applied Physics Letters
  issn: '00036951'

## Conference



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## Funding

- identifier: JPMJCR21O1
  funder_name: Core Research for Evolutional Science and Technology
- identifier: JPMXP1122715503
  funder_name: Ministry of Education, Culture, Sports, Science and Technology

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## Fileset

- id: 568f4f25-4708-4836-a64d-d1064b7f1b7c
  filename: AHE reader MDR.pdf
  content_type: application/pdf
  size: 1479529
  md5: aecf2cf463bb5a87bd834a1c2b3570de
- id: 2bb8cfe8-a9c0-425e-b375-a913b75fed9c
  filename: Supplementary_material_AHEreader.pdf
  content_type: application/pdf
  size: 643651
  md5: c37be2036c55c1736556f38b3b9adcf8

## Thumbnail

fileset_id: 568f4f25-4708-4836-a64d-d1064b7f1b7c
filename: AHE reader MDR.pdf