Enhanced magnetic field concentration using windmill-like ferromagnets

Applied field; Diameter ratio; Different effects; Ferromagnetic systems; Ferromagnets; Field concentrations; Finite-element calculations; High magnetic fields; Magnetic-field; Proof of concept; Materials Science (all); Engineering (all); General Engineering; General Materials Science

Abstract :

[en] 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.

Disciplines :

Physics

Author, co-author :

Bort-Soldevila, Natanael ; Departament de Física, Universitat Autònoma de Barcelona, Barcelona, Spain

Cunill-Subiranas, Jaume ; Departament de Física, Universitat Autònoma de Barcelona, Barcelona, Spain

Barrera, Aleix ; Institut de Ciència de Materials de Barcelona ICMAB-CSIC, Campus UAB, Barcelona, Spain

Del-Valle, Nuria ; Departament de Física, Universitat Autònoma de Barcelona, Barcelona, Spain

Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés

Uhlír, Vojtech ; CEITEC BUT, Brno University of Technology, Brno, Czech Republic ; Institute of Physical Engineering, Brno University of Technology, Brno, Czech Republic

Bending, Simon ; Department of Physics, Centre for Nanoscience and Nanotechnology, University of Bath, Bath, United Kingdom

Palau, Anna ; Institut de Ciència de Materials de Barcelona ICMAB-CSIC, Campus UAB, Barcelona, Spain

Navau, Carles ; Departament de Física, Universitat Autònoma de Barcelona, Barcelona, Spain

Language :

English

Title :

Enhanced magnetic field concentration using windmill-like ferromagnets

Publication date :

February 2024

Journal title :

APL Materials

ISSN :

2166-532X

Publisher :

American Institute of Physics Inc.

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://pubs.aip.org/aip/apm/article-pdf/doi/10.1063/5.0187035/19685057/021123_1_5.0187035.pdf

Funders :

MICINN - Ministerio de Ciencia e Innovacion [ES]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
COST - European Cooperation in Science and Technology [BE]
EPSRC - Engineering and Physical Sciences Research Council [GB]
AGAUR - Agència de Gestió d'Ajuts Universitaris i de Recerca [ES]

Funding text :

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.

Available on ORBi :

since 20 March 2024

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