Magnetometry of individual polycrystalline ferromagnetic nanowires
Shamsudhin, Naveen (ETH Zurich. Multi-Scale Robotics Laboratory)
Tao, Ye (ETH Zurich. Department of Physics)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Jang, Bumjin (ETH Zurich. Multi-Scale Robotics Laboratory)
Degen, Christian L. (ETH Zurich. Department of Physics)
Nelson, Bradley J. (ETH Zurich. Multi-Scale Robotics Laboratory)
Pané i Vidal, Salvador (ETH Zurich. Department of Physics)

Date:	2016
Abstract:	Ferromagnetic nanowires are finding use as untethered sensors and actuators for probing micro- and nanoscale biophysical phenomena, such as for localized sensing and application of forces and torques on biological samples, for tissue heating through magnetic hyperthermia, and for micro-rheology. Quantifying the magnetic properties of individual isolated nanowires is crucial for such applications. We use dynamic cantilever magnetometry to measure the magnetic properties of individual sub-500nm diameter polycrystalline nanowires of Ni and Ni80Co20 fabricated by template-assisted electrochemical deposition. The values are compared with bulk, ensemble measurements when the nanowires are still embedded within their growth matrix. We find that single-particle and ensemble measurements of nanowires yield significantly different results that reflect inter-nanowire interactions and chemical modifications of the sample during the release process from the growth matrix. The results highlight the importance of performing single-particle characterization for objects that will be used as individual magnetic nanoactuators or nanosensors in biomedical applications.
Grants:	European Commission 296679 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Cantilever magnetometry ; Ferromagnetic nanowires ; Nanorobotics ; Electron backscattered diffraction
Published in:	Small, Vol. 12, issue 46 (Dec. 2016) , p. 6363-6369, ISSN 1613-6829

DOI: 10.1002/smll.201602338

Post-print 17 p, 2.8 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Research articles
Articles > Published articles