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journal article·2024-02-01Open access

Enhanced magnetic field concentration using windmill-like ferromagnets

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

APL Materials· Volume 12· Issue 2
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Source abstract

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.
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Research context

OpenAlex topics: Magnetic Field Sensors Techniques · Characterization and Applications of Magnetic Nanoparticles · Wireless Power Transfer Systems

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departament de Física, Universitat Autònoma de Barcelona 1 , 08193 Bellaterra, Barcelona, Spain

Institut de Ciència de Materials de Barcelona ICMAB-CSIC, Campus UAB 2 , 08193 Bellaterra, Barcelona, Spain

Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège 3 , B-4000 Sart Tilman, Belgium

CEITEC BUT, Brno University of Technology 4 , Purkyňova 123, 612 00 Brno, Czechia

Institute of Physical Engineering, Brno University of Technology 5 , Technická 2, 616 69 Brno, Czechia

Department of Physics, Centre for Nanoscience and Nanotechnology, University of Bath 6 , BA2 7AY Bath, United Kingdom

Funding

Ministerio de Ciencia e Innovación · Fonds De La Recherche Scientifique - FNRS · European Cooperation in Science and Technology · Technology Agency of the Czech Republic · Engineering and Physical Sciences Research Council · Agència de Gestió dʼAjuts Universitaris i de Recerca

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