Enhanced magnetic field concentration using windmill-like ferromagnets

Natanael Bort-Soldevila; Jaume Cunill-Subiranas; Aleix Barrera; Nuria Del-Valle; Alejandro V. Silhanek; Vojtech Uhlír; Simon Bending; Anna Palau; Carles Navau

doi:10.1063/5.0187035

Enhanced magnetic field concentration using windmill-like ferromagnets

Natanael Bort-Soldevila, Jaume Cunill-Subiranas, Aleix Barrera, Nuria Del-Valle, Alejandro V. Silhanek, Vojtech Uhlír, Simon Bending, Anna Palau, Carles Navau

Research output: Contribution to journal › Article › peer-review

Abstract

Magnetic sensors are used in many technologies and industries, such as medicine, telecommunications, robotics, the Internet of Things, etc. The sensitivity of these magnetic sensors is a key aspect, as it determines their precision. In this article, we investigate how a thin windmill-like ferromagnetic system can hugely concentrate a magnetic field at its core. A magnetic sensor combined with such a device enhances its sensitivity by a large factor. We describe the different effects that provide this enhancement: the thickness of the device and its unique windmill-like geometry. An expression for the magnetic field in its core is introduced and verified using finite-element calculations. The results show that a high magnetic field concentration is achieved for a low thickness-diameter ratio of the device. Proof-of-concept experiments further demonstrate the significant concentration of the magnetic field when the thickness-diameter ratio is low, reaching levels up to 150 times stronger than the applied field.

Original language	English
Article number	021123
Number of pages	7
Journal	APL Materials
Volume	12
Issue number	2
Early online date	20 Feb 2024
DOIs	https://doi.org/10.1063/5.0187035
Publication status	Published - 29 Feb 2024

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding

This work was supported by (a) the Spanish Ministry of Science and Innovation MCIN/AEI/10.13039/501100011033/through CHIST-ERA PCI2021-122028-2A, PCI2021-122083-2A (co-financed by the European Union Next Generation EU/PRTR), HTSUPERFUN PID2021-124680OB-I00 (co-financed by ERDF “A way of making Europe”), and PID2019-104670GB-I00; (b) Fonds de la Recherche Scientifique—FNRS under the programs PDR T.0204.21, CDR J.0176.22, and EraNet-CHIST-ERA R.8003.21; (c) the Research Foundation and by European Cooperation in Science and Technology (COST, www.cost.eu ) through COST Action SUPERQUMAP (CA 21144); (d) TACR EraNet CHIST-ERA project MetaMagIC TH77010001; and (e) Engineering and Physical Sciences Research Council (EPSRC) in the United Kingdom under Grant No. EP/W022680/1. J.C.-S. acknowledges funding from AGAUR-FI Joan Oró grants (2023 FI-3 00065), Generalitat de Catalunya. A.B. acknowledges support from the MICIN Predoctoral Fellowship (PRE2019-09781) and the UAB doctorate program on Materials Science.

Funders	Funder number
Catalan agency AGAUR	2023 FI-3 00065
European Union Next Generation EU/PRTR	PID2021-124680OB-I00
Engineering and Physical Sciences Research Council	EP/W022680/1
COST Association	MetaMagIC TH77010001, CA 21144
Fonds de la Recherche Scientifique FNRS	CDR J.0176.22, PDR T.0204.21
Departament de Salut - Generalitat de Catalunya
Ministerio de Ciencia e Innovacion	PCI2021-122083-2A, MCIN/AEI/10.13039/501100011033/through CHIST-ERA PCI2021-122028-2A, PRE2019-09781
European Regional Development Fund	PID2019-104670GB-I00
Universitat Autònoma de Barcelona

ASJC Scopus subject areas

General Materials Science
General Engineering

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10.1063/5.0187035Licence: CC BY

Cite this

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AU - Silhanek, Alejandro V.

AU - Uhlír, Vojtech

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Enhanced magnetic field concentration using windmill-like ferromagnets

Abstract

Data Availability Statement

Funding

ASJC Scopus subject areas

Access to Document

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