Spin canting across core/shell Fe3 O4 /Mnx Fe3-x O4 nanoparticles

Scientific Reports
Samuel D OberdickSara A Majetich

Abstract

Magnetic nanoparticles (MNPs) have become increasingly important in biomedical applications like magnetic imaging and hyperthermia based cancer treatment. Understanding their magnetic spin configurations is important for optimizing these applications. The measured magnetization of MNPs can be significantly lower than bulk counterparts, often due to canted spins. This has previously been presumed to be a surface effect, where reduced exchange allows spins closest to the nanoparticle surface to deviate locally from collinear structures. We demonstrate that intraparticle effects can induce spin canting throughout a MNP via the Dzyaloshinskii-Moriya interaction (DMI). We study ~7.4 nm diameter, core/shell Fe3O4/MnxFe3-xO4 MNPs with a 0.5 nm Mn-ferrite shell. Mössbauer spectroscopy, x-ray absorption spectroscopy and x-ray magnetic circular dichroism are used to determine chemical structure of core and shell. Polarized small angle neutron scattering shows parallel and perpendicular magnetic correlations, suggesting multiparticle coherent spin canting in an applied field. Atomistic simulations reveal the underlying mechanism of the observed spin canting. These show that strong DMI can lead to magnetic frustration within the shell and ...Continue Reading

References

Oct 1, 1996·Physical Review. B, Condensed Matter·J P ChenA Kostikas
Jun 1, 1991·Physical Review. B, Condensed Matter· van der Laan G, B T Thole
Jul 8, 1996·Physical Review Letters·R H KodamaS Foner
Jul 11, 2002·Journal of the American Chemical Society·Shouheng Sun, Hao Zeng
Jan 8, 2004·Journal of the American Chemical Society·Shouheng SunGuanxiong Li
Jul 20, 2010·Micron : the International Research and Review Journal for Microscopy·Eli Stavitski, Frank M F de Groot
Sep 28, 2010·Physical Review Letters·K L KryckaS A Majetich
Jun 28, 2011·Nature Nanotechnology·Jae-Hyun LeeJinwoo Cheon
Sep 17, 2013·Micron : the International Research and Review Journal for Microscopy·G LucasC Hébert
Dec 18, 2013·Nature Communications·M EstraderJ Nogués
Oct 18, 2014·Physical Review Letters·K L KryckaS A Majetich
Jun 30, 2016·Chemical Reviews·Liheng WuShouheng Sun

❮ Previous
Next ❯

Citations

Sep 26, 2020·Physical Review Letters·Laura G VivasAndreas Michels
Jul 14, 2020·Nanotechnology·Mathias BersweilerPhilipp Bender
Feb 19, 2020·Scientific Reports·Roberto MorenoRichard F L Evans
Apr 16, 2021·Advanced Science·Aidin LakPhilipp Bender
Oct 1, 2019·Analytical Chemistry·Sarah E SandlerO Thompson Mefford
Dec 31, 2021·Chemical Reviews·Zhenhui MaShouheng Sun

❮ Previous
Next ❯

Methods Mentioned

BETA
neutron diffraction
small
angle neutron scattering
scanning
transmission electron microscopy
electron
atomic
X-ray
circular dichroism
atomic absorption spectroscopy

Software Mentioned

CiMe
VAMPIRE
CTM4XAS
PASANS

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

© 2022 Meta ULC. All rights reserved