TY - JOUR
T1 - Magnetometry of Individual Polycrystalline Ferromagnetic Nanowires
AU - Shamsudhin, Naveen
AU - Tao, Ye
AU - Sort, Jordi
AU - Jang, Bumjin
AU - Degen, Christian L.
AU - Nelson, Bradley J.
AU - Pané, Salvador
PY - 2016/12/14
Y1 - 2016/12/14
N2 - © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 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 microrheology. Quantifying the magnetic properties of individual isolated nanowires is crucial for such applications. Dynamic cantilever magnetometry is used to measure the magnetic properties of individual sub-500 nm 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. It is found 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.
AB - © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 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 microrheology. Quantifying the magnetic properties of individual isolated nanowires is crucial for such applications. Dynamic cantilever magnetometry is used to measure the magnetic properties of individual sub-500 nm 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. It is found 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.
KW - cantilever magnetometry
KW - electron backscattered diffraction
KW - ferromagnetic nanowires
KW - nanorobotics
UR - https://ddd.uab.cat/record/170466
U2 - https://doi.org/10.1002/smll.201602338
DO - https://doi.org/10.1002/smll.201602338
M3 - Article
VL - 12
SP - 6363
EP - 6369
JO - Small
JF - Small
SN - 1613-6810
IS - 46
ER -