Magnetization reversal measurements of size-selected iron oxide particles produced via an aerosol route

Bertram Schleicher, Unto Tapper, Esko Kauppinen, M. Martin, L. Roschier, M. Paalanen, W. Wernsdorfer, A. Benoit

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

We report first measurements of the magnetization reversal of monodisperse 30 nm and 50 nm ferromagnetic Fe3O4 particles. These particles are produced in a carrier gas as an aerosol by spray pyrolysis. After production and size selection, they are precipitated on a silicon chip with a niobium SQUID (superconducting quantum interference device) incorporated on its surface. By changing a magnetic field in the plane of the SQUID, we can measure the magnetization reversal of the particles by the flux they induce into the SQUID.
The angular dependence of this reversal is determined by rotating the magnetic field around the SQUID. Scanning electron microscope (SEM) images have confirmed the particle size and revealed the position of the collected particles. If the particle concentration is too high, we cannot detect changes in the magnetic moment of a single particle, but measure the magnetic properties of the whole assembly.
If only a few particles are found on the SQUID loop the angular dependence of the magnetic reversal of a single particle can be measured; this result is compared with a simple model of magnetization reversal.
Original languageEnglish
Pages (from-to)315-320
JournalApplied Organometallic Chemistry
Volume12
Issue number5
DOIs
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed
EventNanoporous Materials and Magnetic Properties of Nanostructured Materials: Organized by the ECNM - Frascati, Italy
Duration: 19 Sep 199720 Sep 1997

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Magnetization reversal
SQUIDs
Aerosols
Niobium
Magnetic fields
Spray pyrolysis
Silicon
Magnetic moments
Magnetic properties
Electron microscopes
Gases
Particle size
ferric oxide
Fluxes
Scanning

Cite this

Schleicher, Bertram ; Tapper, Unto ; Kauppinen, Esko ; Martin, M. ; Roschier, L. ; Paalanen, M. ; Wernsdorfer, W. ; Benoit, A. / Magnetization reversal measurements of size-selected iron oxide particles produced via an aerosol route. In: Applied Organometallic Chemistry. 1998 ; Vol. 12, No. 5. pp. 315-320.
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abstract = "We report first measurements of the magnetization reversal of monodisperse 30 nm and 50 nm ferromagnetic Fe3O4 particles. These particles are produced in a carrier gas as an aerosol by spray pyrolysis. After production and size selection, they are precipitated on a silicon chip with a niobium SQUID (superconducting quantum interference device) incorporated on its surface. By changing a magnetic field in the plane of the SQUID, we can measure the magnetization reversal of the particles by the flux they induce into the SQUID. The angular dependence of this reversal is determined by rotating the magnetic field around the SQUID. Scanning electron microscope (SEM) images have confirmed the particle size and revealed the position of the collected particles. If the particle concentration is too high, we cannot detect changes in the magnetic moment of a single particle, but measure the magnetic properties of the whole assembly. If only a few particles are found on the SQUID loop the angular dependence of the magnetic reversal of a single particle can be measured; this result is compared with a simple model of magnetization reversal.",
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Magnetization reversal measurements of size-selected iron oxide particles produced via an aerosol route. / Schleicher, Bertram; Tapper, Unto; Kauppinen, Esko; Martin, M.; Roschier, L.; Paalanen, M.; Wernsdorfer, W.; Benoit, A.

In: Applied Organometallic Chemistry, Vol. 12, No. 5, 1998, p. 315-320.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Magnetization reversal measurements of size-selected iron oxide particles produced via an aerosol route

AU - Schleicher, Bertram

AU - Tapper, Unto

AU - Kauppinen, Esko

AU - Martin, M.

AU - Roschier, L.

AU - Paalanen, M.

AU - Wernsdorfer, W.

AU - Benoit, A.

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N2 - We report first measurements of the magnetization reversal of monodisperse 30 nm and 50 nm ferromagnetic Fe3O4 particles. These particles are produced in a carrier gas as an aerosol by spray pyrolysis. After production and size selection, they are precipitated on a silicon chip with a niobium SQUID (superconducting quantum interference device) incorporated on its surface. By changing a magnetic field in the plane of the SQUID, we can measure the magnetization reversal of the particles by the flux they induce into the SQUID. The angular dependence of this reversal is determined by rotating the magnetic field around the SQUID. Scanning electron microscope (SEM) images have confirmed the particle size and revealed the position of the collected particles. If the particle concentration is too high, we cannot detect changes in the magnetic moment of a single particle, but measure the magnetic properties of the whole assembly. If only a few particles are found on the SQUID loop the angular dependence of the magnetic reversal of a single particle can be measured; this result is compared with a simple model of magnetization reversal.

AB - We report first measurements of the magnetization reversal of monodisperse 30 nm and 50 nm ferromagnetic Fe3O4 particles. These particles are produced in a carrier gas as an aerosol by spray pyrolysis. After production and size selection, they are precipitated on a silicon chip with a niobium SQUID (superconducting quantum interference device) incorporated on its surface. By changing a magnetic field in the plane of the SQUID, we can measure the magnetization reversal of the particles by the flux they induce into the SQUID. The angular dependence of this reversal is determined by rotating the magnetic field around the SQUID. Scanning electron microscope (SEM) images have confirmed the particle size and revealed the position of the collected particles. If the particle concentration is too high, we cannot detect changes in the magnetic moment of a single particle, but measure the magnetic properties of the whole assembly. If only a few particles are found on the SQUID loop the angular dependence of the magnetic reversal of a single particle can be measured; this result is compared with a simple model of magnetization reversal.

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DO - 10.1002/(SICI)1099-0739(199805)12:5<315::AID-AOC723>3.0.CO;2-6

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