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Design of intense nanoscale stray fields and gradients at magnetic nanorod interfaces

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Abstract
We explore electrodeposited ordered arrays of Fe, Ni, and Co nanorods embedded in anodic alumina membranes as a source of intense magnetic stray field gradients localized at the nanoscale. We perform a multiscale characterization of the stray fields using a combination of experimental methods (magnetooptical Kerr effect and virtual bright field differential phase contrast imaging) and micromagnetic simulations and establish a clear correlation between the stray fields and the magnetic configurations of the nanorods. For uniformly magnetized Fe and Ni wires, the field gradients vary following saturation magnetization of the corresponding metal and the diameter of the wires. In the case of Co nanorods, very localized (similar to 10 nm) and intense (>1 T) stray field sources are associated with the cores of magnetic vortexes. Confinement of that strong field at extremely small dimensions leads to exceptionally high field gradients up to 10(8) T/m. These results demonstrate a clear path to design and fine-tune nanoscale magnetic stray field ordered patterns with a broad applicability in key nanotechnologies, such as nanomedicine, nanobiology, nanoplasmonics, and sensors.
Keywords
nanomagnets arrays, TEM, MOKE, micromagnetic simulations, patterned stray fields, DOMAIN-WALL, NANOWIRES, MANIPULATION, ARRAYS

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MLA
Ivanov, Yurii P., et al. “Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces.” ACS APPLIED MATERIALS & INTERFACES, vol. 11, no. 4, 2019, pp. 4678–85.
APA
Ivanov, Y. P., Leliaert, J., Crespo, A., Pancaldi, M., Tollan, C., Kosel, J., … Vavassori, P. (2019). Design of intense nanoscale stray fields and gradients at magnetic nanorod interfaces. ACS APPLIED MATERIALS & INTERFACES, 11(4), 4678–4685.
Chicago author-date
Ivanov, Yurii P, Jonathan Leliaert, Adrian Crespo, Matteo Pancaldi, Christopher Tollan, Jurgen Kosel, Andrey Chuvilin, and Paolo Vavassori. 2019. “Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces.” ACS APPLIED MATERIALS & INTERFACES 11 (4): 4678–85.
Chicago author-date (all authors)
Ivanov, Yurii P, Jonathan Leliaert, Adrian Crespo, Matteo Pancaldi, Christopher Tollan, Jurgen Kosel, Andrey Chuvilin, and Paolo Vavassori. 2019. “Design of Intense Nanoscale Stray Fields and Gradients at Magnetic Nanorod Interfaces.” ACS APPLIED MATERIALS & INTERFACES 11 (4): 4678–4685.
Vancouver
1.
Ivanov YP, Leliaert J, Crespo A, Pancaldi M, Tollan C, Kosel J, et al. Design of intense nanoscale stray fields and gradients at magnetic nanorod interfaces. ACS APPLIED MATERIALS & INTERFACES. 2019;11(4):4678–85.
IEEE
[1]
Y. P. Ivanov et al., “Design of intense nanoscale stray fields and gradients at magnetic nanorod interfaces,” ACS APPLIED MATERIALS & INTERFACES, vol. 11, no. 4, pp. 4678–4685, 2019.
@article{8587507,
  abstract     = {We explore electrodeposited ordered arrays of Fe, Ni, and Co nanorods embedded in anodic alumina membranes as a source of intense magnetic stray field gradients localized at the nanoscale. We perform a multiscale characterization of the stray fields using a combination of experimental methods (magnetooptical Kerr effect and virtual bright field differential phase contrast imaging) and micromagnetic simulations and establish a clear correlation between the stray fields and the magnetic configurations of the nanorods. For uniformly magnetized Fe and Ni wires, the field gradients vary following saturation magnetization of the corresponding metal and the diameter of the wires. In the case of Co nanorods, very localized (similar to 10 nm) and intense (>1 T) stray field sources are associated with the cores of magnetic vortexes. Confinement of that strong field at extremely small dimensions leads to exceptionally high field gradients up to 10(8) T/m. These results demonstrate a clear path to design and fine-tune nanoscale magnetic stray field ordered patterns with a broad applicability in key nanotechnologies, such as nanomedicine, nanobiology, nanoplasmonics, and sensors.},
  author       = {Ivanov, Yurii P and Leliaert, Jonathan and Crespo, Adrian and Pancaldi, Matteo and Tollan, Christopher and Kosel, Jurgen and Chuvilin, Andrey and Vavassori, Paolo},
  issn         = {1944-8244},
  journal      = {ACS APPLIED MATERIALS & INTERFACES},
  keywords     = {nanomagnets arrays,TEM,MOKE,micromagnetic simulations,patterned stray fields,DOMAIN-WALL,NANOWIRES,MANIPULATION,ARRAYS},
  language     = {eng},
  number       = {4},
  pages        = {4678--4685},
  title        = {Design of intense nanoscale stray fields and gradients at magnetic nanorod interfaces},
  url          = {http://dx.doi.org/10.1021/acsami.8b19873},
  volume       = {11},
  year         = {2019},
}

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