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MAGNETIC CHARACTERIZATION OF SELF-ASSEMBLED ONE-DIMENSIONAL NETWORKS OF MAGNETIC NANOPARTICLES

López Muñoz, Mario Salvador LU (2019) FYSK02 20191
Synchrotron Radiation Research
Department of Physics
Abstract
In this thesis, a magnetic study of two dierent arrangements of Fe3O4 nanoparticles is
presented. The nanoparticles are generated using an aerosol technique and guided onto a
substrate. The rst sample was produced by guiding the nanoparticles onto the substrate
using an electric eld, resulting in large clusters of randomly oriented Nanoparticle (NP).
The second sample was created by also applying a magnetic eld which resulted in the
formation of self-assembled networks of one-dimensional Nanowire (NW) made up from
individual nanoparticles. To measure the magnetic properties of the samples a Supercondunting
Quantum Interference Device (SQUID) is used. Magnetization curves measured
at 300 K and 1:8 K show a dierence in the... (More)
In this thesis, a magnetic study of two dierent arrangements of Fe3O4 nanoparticles is
presented. The nanoparticles are generated using an aerosol technique and guided onto a
substrate. The rst sample was produced by guiding the nanoparticles onto the substrate
using an electric eld, resulting in large clusters of randomly oriented Nanoparticle (NP).
The second sample was created by also applying a magnetic eld which resulted in the
formation of self-assembled networks of one-dimensional Nanowire (NW) made up from
individual nanoparticles. To measure the magnetic properties of the samples a Supercondunting
Quantum Interference Device (SQUID) is used. Magnetization curves measured
at 300 K and 1:8 K show a dierence in the magnetization behavior for the two samples
and an increase in the remanent magnetization of 50% for the self-assembled structures.
The results are interpreted based on the Stoner-Wohlfarth model, and the shortcomings of
applying this model to our systems are discussed. (Less)
Popular Abstract
Magnetic Characterization of self-assembled magnetic nanoparticles

The understanding of magnetism has always been an important goal for humankind. Magnetic materials are part of our daily routines nowadays. They are essential parts in remote controls, speakers and in magnetic resonance imaging (MRI) in hospitals. They are key components in renewable energy technology with the ability to convert motion into electric power and replace fossil fuel energy sources.

The presented Bachelor project is in the field of nanomagnetism, a branch of physics that deals with the magnetic behavior of nanoscale objects. The nano- prefix means 10E(-9), therefore nanoparticles are particles that are around 10E(-9)m. This Bachelor project investigates... (More)
Magnetic Characterization of self-assembled magnetic nanoparticles

The understanding of magnetism has always been an important goal for humankind. Magnetic materials are part of our daily routines nowadays. They are essential parts in remote controls, speakers and in magnetic resonance imaging (MRI) in hospitals. They are key components in renewable energy technology with the ability to convert motion into electric power and replace fossil fuel energy sources.

The presented Bachelor project is in the field of nanomagnetism, a branch of physics that deals with the magnetic behavior of nanoscale objects. The nano- prefix means 10E(-9), therefore nanoparticles are particles that are around 10E(-9)m. This Bachelor project investigates differences in the magnetic response of an ordered system, which organizes without external interaction, composed of nanowires made up from individual nanoparticles with a second sample with a random arrangement of nanoparticles. The material used is Magnetite (Fe3O4), a clear example of versatile material that works in MRI imaging, data storage, and cancer treatment. The structures are created for this project using an aerosol technique based on a Spark Discharge Generation (SDG), capable of producing particles with tunable composition, crystal structure, and narrow size distribution that can be deposited onto any substrate. Magnetic self-assembled structures made up of nanoparticles could be used in catalysis, energy storage, and as building blocks for future high performing permanent magnets for green technologies such as electric vehicles and wind turbines.

This Bachelor thesis is a part of a larger project that is studying how the particle size, particle composition, and deposition parameters determine the material's final properties. To measure the magnetic properties of our samples, we use the Superconducting Quantum Interference Device (SQUID), a very sensitive magnetometer. The comparison revealed a clear difference in magnetization behavior between the samples and an increase in the remanent magnetization of 50% for the self-assembled system. It is clear that the system is temperature dependent, and when the system is at ambient temperature, the differences are less noticeable. (Less)
Please use this url to cite or link to this publication:
author
López Muñoz, Mario Salvador LU
supervisor
organization
course
FYSK02 20191
year
type
M2 - Bachelor Degree
subject
keywords
Nanomagnetism, Stoner-Wohlfarth, Magnetite Fe3O4, nanoparticles, Magnetic Characterization, Spark Discharge Technique
language
English
id
8987598
date added to LUP
2019-07-05 15:14:30
date last changed
2019-07-05 15:14:30
@misc{8987598,
  abstract     = {{In this thesis, a magnetic study of two dierent arrangements of Fe3O4 nanoparticles is
presented. The nanoparticles are generated using an aerosol technique and guided onto a
substrate. The rst sample was produced by guiding the nanoparticles onto the substrate
using an electric eld, resulting in large clusters of randomly oriented Nanoparticle (NP).
The second sample was created by also applying a magnetic eld which resulted in the
formation of self-assembled networks of one-dimensional Nanowire (NW) made up from
individual nanoparticles. To measure the magnetic properties of the samples a Supercondunting
Quantum Interference Device (SQUID) is used. Magnetization curves measured
at 300 K and 1:8 K show a dierence in the magnetization behavior for the two samples
and an increase in the remanent magnetization of 50% for the self-assembled structures.
The results are interpreted based on the Stoner-Wohlfarth model, and the shortcomings of
applying this model to our systems are discussed.}},
  author       = {{López Muñoz, Mario Salvador}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{MAGNETIC CHARACTERIZATION OF SELF-ASSEMBLED ONE-DIMENSIONAL NETWORKS OF MAGNETIC NANOPARTICLES}},
  year         = {{2019}},
}