scispace - formally typeset
Search or ask a question
Topic

Magnetite

About: Magnetite is a research topic. Over the lifetime, 10277 publications have been published within this topic receiving 278071 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a stable water-based dispersion of sodium dodecyl sulfate (SDS)/oleic acid bilayer coated magnetite aggregates was first synthesized and mixed with monomer styrene miniemulsion.

174 citations

Journal ArticleDOI
TL;DR: The magnetic microstructure of a natural, finely exsolved intergrowth of submicron magnetite blocks in an ulvöspinel matrix is characterized by using off-axis electron holography in the transmission electron microscope to reveal an extremely complicated magnetic structure dominated by the shapes of the blocks and magnetostatic interactions.
Abstract: The magnetic microstructure of a natural, finely exsolved intergrowth of submicron magnetite blocks in an ulvospinel matrix is characterized by using off-axis electron holography in the transmission electron microscope. Single-domain and vortex states in individual blocks, as well as magnetostatic interaction fields between them, are imaged at a spatial resolution approaching the nanometer scale. The images reveal an extremely complicated magnetic structure dominated by the shapes of the blocks and magnetostatic interactions. Magnetic superstates, in which clusters of magnetite blocks act collectively to form vortex and multidomain states that have zero net magnetization, are observed directly.

173 citations

Journal ArticleDOI
TL;DR: In this paper, a well defined hematite and magnetite colloidal particles of different morphologies were prepared by hydrothermal aging of strongly alkaline solutions of ferric salts and triethanolamine (TEA) at 250°C.

173 citations

Journal ArticleDOI
TL;DR: Hysteresis measurements, Lowrie-Fuller tests, Cisowski tests, and low-temperature demagnetization experiments on samples of the Knox Dolomite, Trenton Limestone, and Onondaga Limestone indicate that the remanence in these remagnetized carbonate units resides principally in single-domain magnetite, in contrast to previous interpretations as mentioned in this paper.
Abstract: Hysteresis measurements, Lowrie-Fuller tests, Cisowski tests, and low-temperature demagnetization experiments on samples of the Knox Dolomite, Trenton Limestone, and Onondaga Limestone indicate that the remanence in these remagnetized carbonate units resides principally in single-domain magnetite, in contrast to previous interpretations. Volumetrically, however, a significant fraction of the magnetite is coarser grained, as previous scanning electron microscopic work on magnetic extracts has shown. These conclusions are based mainly on the characteristic “wasp-waisted” shape of the hysteresis loops and on the anomalously high ratios of remanent coercivity to bulk coercivity, both of which clearly indicate a bimodal distribution of coercivities/grain sizes. The magnetization is controlled mainly by cubic magnetocrystalline anisotropy, consistent with the spheroidal particles commonly observed in extracts. Hysteresis trends show that especially the finest particles lack shape anisotropy. In view of these conclusions, the two components of natural remanence in these rocks are interpreted as (1) a late Paleozoic (Kiaman) chemical remanence carried by single-domain diagenetic magnetite and (2) a Cenozoic thermoviscous overprint residing principally in coarser, pseudosingle domain and multidomain magnetite, also of late Paleozoic diagenetic origin.

173 citations


Network Information
Related Topics (5)
Carbon
129.8K papers, 2.7M citations
83% related
Amorphous solid
117K papers, 2.2M citations
83% related
Adsorption
226.4K papers, 5.9M citations
83% related
Oxide
213.4K papers, 3.6M citations
82% related
Nanoparticle
85.9K papers, 2.6M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023570
20221,277
2021367
2020478
2019494
2018446