Abstract

Microscale magnetic compasses have been synthesized with high yield. These ferromagnetic iron carbide nano-particles, which are encapsulated in a pair of parallel carbon needles, change their orientation in response to an external magnetic field. Electron holography reveals magnetic fields confined to the vicinity of the bicone-shaped particles, which are composed of only a few ferromagnetic domains. Aligned magnetically and encapsulated in an acrylate polymer matrix, these micro-compasses exhibit anisotropic bulk magnetic permeability with an easy axis normal to the needle direction that can be understood as a result of the anisotropic demagnetizing field of a non-spherical single-domain particle. This novel type of material with orthogonal magnetic and structural axes could be highly useful as magnetic components in electromagnetic wave absorbent materials and magnetorheological fluids.

Original languageEnglish (US)
Article number094301
JournalJournal of Applied Physics
Volume122
Issue number9
DOIs
StatePublished - Sep 7 2017

Fingerprint

magnetic compasses
microbalances
needles
magnetorheological fluids
absorbents
acrylates
magnetic fields
carbides
holography
electromagnetic radiation
magnetic permeability
iron
carbon
fluids
polymers
matrices
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Shiozawa, H., Zhang, D., Eisterer, M., Ayala, P., Pichler, T., McCartney, M., & Smith, D. (2017). Microscale magnetic compasses. Journal of Applied Physics, 122(9), [094301]. https://doi.org/10.1063/1.4985838

Microscale magnetic compasses. / Shiozawa, Hidetsugu; Zhang, Desai; Eisterer, Michael; Ayala, Paola; Pichler, Thomas; McCartney, Martha; Smith, David.

In: Journal of Applied Physics, Vol. 122, No. 9, 094301, 07.09.2017.

Research output: Contribution to journalArticle

Shiozawa, H, Zhang, D, Eisterer, M, Ayala, P, Pichler, T, McCartney, M & Smith, D 2017, 'Microscale magnetic compasses', Journal of Applied Physics, vol. 122, no. 9, 094301. https://doi.org/10.1063/1.4985838
Shiozawa H, Zhang D, Eisterer M, Ayala P, Pichler T, McCartney M et al. Microscale magnetic compasses. Journal of Applied Physics. 2017 Sep 7;122(9). 094301. https://doi.org/10.1063/1.4985838
Shiozawa, Hidetsugu ; Zhang, Desai ; Eisterer, Michael ; Ayala, Paola ; Pichler, Thomas ; McCartney, Martha ; Smith, David. / Microscale magnetic compasses. In: Journal of Applied Physics. 2017 ; Vol. 122, No. 9.
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