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Defect‐Driven Magnetization Configuration of Isolated Linear Assemblies of Iron Oxide Nanoparticles
- Source :
- Advanced Functional Materials, Advanced Functional Materials, Wiley, 2019, 29 (45), pp.1903927. ⟨10.1002/adfm.201903927⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; The magnetization state of one-dimensional magnetic nanoparticle chains plays a key role for a wide range of applications ranging from diagnosis and therapy in medicine to actuators, sensors and quantum recording media. The interplay between the exact particle orientation and the magnetic anisotropy is in turn crucial for controlling the overall magnetization state with high precision. Here, we report on a three-dimensional description of the magnetic structure of one-NP-wide chains. In this aim, we combined two complementary experimental techniques, magnetic force microscopy (MFM) and electronic holography (EH) which are sensitive to out-of-plane and in-plane magnetization components, respectively. We extended our approach to micromagnetic simulations which provided results in good agreement with MFM and EH. The findings are at variance with the known results on unidirectional nanoparticle assemblies, and show that magnetization is rarely strictly collinear to the chain axis. The magnetic structure of one-NP-wide chains can be interpreted as head-to-head magnetic domain structures with off-axis magnetization components, which is very sensitive to morphological defects in the chain structure such as minute size variation of NPs, tiny misalignment of NPs and/or crystal orientation with respect to easy magnetization axis.
- Subjects :
- Materials science
Magnetic domain
AFM / MFM
magnetization states
Nanoparticle
02 engineering and technology
010402 general chemistry
01 natural sciences
e-holography
HR-TEM
Biomaterials
Magnetization
chemistry.chemical_compound
micromagnetic simulations
Electrochemistry
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
One-NP-wide chains
Magnetic structure
Condensed matter physics
[CHIM.MATE]Chemical Sciences/Material chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
3. Good health
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Magnetic anisotropy
chemistry
Particle
Magnetic force microscope
0210 nano-technology
Iron oxide nanoparticles
Subjects
Details
- Language :
- English
- ISSN :
- 1616301X and 16163028
- Database :
- OpenAIRE
- Journal :
- Advanced Functional Materials, Advanced Functional Materials, Wiley, 2019, 29 (45), pp.1903927. ⟨10.1002/adfm.201903927⟩
- Accession number :
- edsair.doi.dedup.....1a696d24716bbf039bfceea71e363b58