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Title: Microscale magnetic compasses

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. Finally, 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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [1];  [2];  [2]
  1. Univ. of Vienna (Austria). Faculty of Physics
  2. Arizona State Univ., Tempe, AZ (United States). Dept. of Physics
  3. Technische Univ. Wien, Vienna (Austria). Atominstitut
Publication Date:
Research Org.:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Org.:
USDOE; Austrian Science Fund (FWF)
OSTI Identifier:
1473880
Alternate Identifier(s):
OSTI ID: 1378143
Grant/Contract Number:  
FG02-04ER46168
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 9; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Shiozawa, Hidetsugu, Zhang, Desai, Eisterer, Michael, Ayala, Paola, Pichler, Thomas, McCartney, Martha R., and Smith, David J. Microscale magnetic compasses. United States: N. p., 2017. Web. doi:10.1063/1.4985838.
Shiozawa, Hidetsugu, Zhang, Desai, Eisterer, Michael, Ayala, Paola, Pichler, Thomas, McCartney, Martha R., & Smith, David J. Microscale magnetic compasses. United States. doi:10.1063/1.4985838.
Shiozawa, Hidetsugu, Zhang, Desai, Eisterer, Michael, Ayala, Paola, Pichler, Thomas, McCartney, Martha R., and Smith, David J. Fri . "Microscale magnetic compasses". United States. doi:10.1063/1.4985838. https://www.osti.gov/servlets/purl/1473880.
@article{osti_1473880,
title = {Microscale magnetic compasses},
author = {Shiozawa, Hidetsugu and Zhang, Desai and Eisterer, Michael and Ayala, Paola and Pichler, Thomas and McCartney, Martha R. and Smith, David J.},
abstractNote = {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. Finally, 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.},
doi = {10.1063/1.4985838},
journal = {Journal of Applied Physics},
number = 9,
volume = 122,
place = {United States},
year = {2017},
month = {9}
}

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