{"id":258,"date":"2024-03-18T19:31:13","date_gmt":"2024-03-18T17:31:13","guid":{"rendered":"https:\/\/webs.uab.cat\/simmas\/?page_id=258"},"modified":"2025-10-17T19:25:09","modified_gmt":"2025-10-17T17:25:09","slug":"shaping-magnetic-fields-at-simmas","status":"publish","type":"page","link":"https:\/\/webs.uab.cat\/simmas\/shaping-magnetic-fields-at-simmas\/","title":{"rendered":"Manipulation of magnetic fields at SiMMaS"},"content":{"rendered":"\n

Some topics developed at SiMMaS<\/h2>\n\n\n\n
Windmill-like concentrators<\/strong><\/em><\/summary>
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We have investigated how a thin windmill-like ferromagnetic system can hugely concentrate a magnetic field at its core. We have described the different effects that provide this enhancement: the thickness of the device and its unique windmill-like geometry. The idea is to use the central part of the windmill as a sensor that would enhance its sensitivity by a large factor due to the presence of the blades. Factors up to 150 times stronger than the applied field can be achieved.<\/p>\n\n\n\n

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Generic representation of a concentration device comparing the magnetic field modulus B<\/em> in (a) a bare ferromagnetic cylindrical core with (b) the same ferromagnetic core but with a shell of windmill blades, both exposed to the same uniform in-plane magnetic field, B<\/em>0<\/sub>.<\/figcaption><\/figure>\n\n\n\n

These windmill-like concentrators have also been studied in the dimensional transition from 3D to 2D. Their properties have been analysed in detail, both theoretically and experimentally. This is a collaborative work together with ICMAB-CSIC in Barcelona, Universit\u00e9 de Li\u00e8ge (Belgium), University of Bath (UK), and CEITEC of Brno University of Technology (Czech Republic) in the context of the METAMAGIC project<\/a>.<\/p>\n\n\n\n

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Simulation of the variation in concentration gains with the concentrator thickness (outer radius R<\/em>o<\/em><\/sub> = 400 \u00b5<\/em>m and inner radius R<\/em>i<\/em><\/sub> = 100 \u00b5<\/em>m.). Panels (a) and (b) illustrate the differences in results obtained with a concentrator without a central core with a ferromagnetic core, respectively.<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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Schematic representation of the system and the XPEEM experiment employing X-ray Magnetic Circular Dichroism (XMCD) for magnetic contrast. The evolution of the average magnetic contrast as a function of the applied field is also depicted.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

More Information:<\/p>\n\n\n\n