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)
Data: |
2016 |
Resum: |
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. |
Ajuts: |
European Commission 296679 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015
|
Drets: |
Tots els drets reservats  |
Llengua: |
Anglès |
Document: |
Article ; recerca ; Versió acceptada per publicar |
Matèria: |
Cantilever magnetometry ;
Ferromagnetic nanowires ;
Nanorobotics ;
Electron backscattered diffraction |
Publicat a: |
Small, Vol. 12, issue 46 (Dec. 2016) , p. 6363-6369, ISSN 1613-6829 |
DOI: 10.1002/smll.201602338
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Registre creat el 2017-02-20, darrera modificació el 2022-02-06