ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
The origin of wasp-waisted shape of magnetization hysteresis loops in 3D CoxFe3-xO4 nanoassemblies
Abstract: Magnetic nanoassemblies magnetize to saturation at low magnetic fields thereby experiencing cooperative magnetic couplings between their building blocks. It is well known that doping Co2+ into iron oxide nanoparticles effectively enhances magnetic anisotropy and coercivity of particles. The magnetization hysteresis loops of binary metal oxides often reveal intriguing features. As such, CoxFe3-xO4 nanoparticles show peculiar non-continuous magnetization reversal processes at zero magnetic fields, the origin of which is still controversial. This abrupt jump in the magnetization is known as wasp-waisted hysteresis loops and its first encounter dates back a few decades ago. Becker et al. have proposed that this anomalous behavior is the result of a superposition of hysteresis loops of grains with different magnetic coercivities. Since then several underlying mechanisms including the co-existence of soft-hard magnetic phases, magnetic dipole-dipole interactions, and spin canting have been reported. We recently synthesized nano-assembled nanoparticles with a complex flower-shape configuration. We found that this unique assembly of Co0.82Fe2.18O4 petal shape nanocrystallites into 3D flower-like nanoassemblies exhibits a wasp-waisted shape of magnetization hysteresis loops that is nonexistent in single-core NPs. In order to shed light on the origin of this peculiar magnetization process and test our hypotheses, we aim to perform magnetic SANS (SANSPOL) measurements at Larmor.
Local Contact: Dr Dirk Honecker
Experimenter: Dr Aidin Lak
Experimenter: Professor Sabrina Disch
Experimenter: Mr Leonhard Rochels
DOI: 10.5286/ISIS.E.RB2300061
ISIS Experiment Number: RB2300061
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2300061-1 | LARMOR | 25 September 2026 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
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publication is as:
[author], [date], [title], [publisher],
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For Example:
Dr Dirk Honecker et al; (2023): The origin of wasp-waisted shape of magnetization hysteresis loops in 3D CoxFe3-xO4 nanoassemblies, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2300061
Data is released under the CC-BY-4.0 license.
