Microscale magnetic compasses

Hidetsugu Shiozawa; Desai Zhang; Michael Eisterer; Paola Ayala; Thomas Pichler; Martha R. McCartney; David J. Smith

doi:10.1063/1.4985838

Microscale magnetic compasses

Hidetsugu Shiozawa (Corresponding author), Desai Zhang, Michael Eisterer, Paola Ayala, Thomas Pichler, Martha R. McCartney, David J. Smith

Electronic Properties of Materials

Publications: Contribution to journal › Article › Peer Reviewed

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 language	English
Article number	094301
Number of pages	6
Journal	Journal of Applied Physics
Volume	122
Issue number	9
DOIs	https://doi.org/10.1063/1.4985838
Publication status	Published - 7 Sept 2017

Austrian Fields of Science 2012

103018 Materials physics
103009 Solid state physics
103020 Surface physics

Keywords

DRUG-DELIVERY
CARBON NANOTUBES
BIOMEDICAL APPLICATIONS
NANOPARTICLES
NICKEL
FUNCTIONALIZATION
IRON
STABILIZATION
NANOCAPSULES
PARTICLES

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10.1063/1.4985838

Cite this

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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. 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.",

keywords = "DRUG-DELIVERY, CARBON NANOTUBES, BIOMEDICAL APPLICATIONS, NANOPARTICLES, NICKEL, FUNCTIONALIZATION, IRON, STABILIZATION, NANOCAPSULES, PARTICLES",

author = "Hidetsugu Shiozawa and Desai Zhang and Michael Eisterer and Paola Ayala and Thomas Pichler and McCartney, {Martha R.} and Smith, {David J.}",

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doi = "10.1063/1.4985838",

language = "English",

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T1 - Microscale magnetic compasses

AU - Shiozawa, Hidetsugu

AU - Zhang, Desai

AU - Eisterer, Michael

AU - Ayala, Paola

AU - Pichler, Thomas

AU - McCartney, Martha R.

AU - Smith, David J.

PY - 2017/9/7

Y1 - 2017/9/7

N2 - 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.

AB - 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.

KW - DRUG-DELIVERY

KW - CARBON NANOTUBES

KW - BIOMEDICAL APPLICATIONS

KW - NANOPARTICLES

KW - NICKEL

KW - FUNCTIONALIZATION

KW - IRON

KW - STABILIZATION

KW - NANOCAPSULES

KW - PARTICLES

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VL - 122

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

M1 - 094301

ER -

Microscale magnetic compasses

Abstract

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Electron and Spin Correlations in Nano Carbon-Metal Hybrids

Correlation and Spin Dynamics in Carbon Nanotubes

Cite this

Microscale magnetic compasses

Abstract

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Projects

Electron and Spin Correlations in Nano Carbon-Metal Hybrids

Correlation and Spin Dynamics in Carbon Nanotubes

Cite this