Large exchange bias in Cr substituted Fe 3 O 4 nanoparticles with FeO subdomains
Source abstract
Abstract
Tuning the anisotropy through exchange bias in bimagnetic nanoparticles is an active research strategy for enhancing and tailoring the magnetic properties for a wide range of applications. Here we present a structural and magnetic characterization of unique FeCr-oxide nanoparticles generated from seed material with a Fe : Cr ratio of 4.71 : 1 using a physical aerosol method based on spark ablation. The nanoparticles have a novel bimagnetic structure composed of a 40 nm ferrimagnetic Cr-substituted Fe3O4 structure with 4 nm antiferromagnetic FexO subdomains. Cooling in an applied magnetic field across the Néel temperature of the FexO subdomains results in a significant shift in the hysteresis, demonstrating the presence of a large exchange bias. The observed shift of μ0HE = 460 mT is among the largest values reported for FexO-Fe3O4-based nanoparticles and is attributed to the large antiferromagnetic-ferrimagnetic interface area provided by the subdomains.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Synthesis of Ferrites · Iron oxide chemistry and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
NanoLund, Lund University, Box 118, 22100 Lund, Sweden
Synchrotron radiation research, Lund University, SE-22100 Lund, Sweden
Solid State Physics, Lund University, Box 118, 22100 Lund, Sweden
Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
MAX IV Laboratory, Lund University, PO Box 118, 221 00, Lund, Sweden
Funding
Crafoordska Stiftelsen · Energimyndigheten · Vetenskapsrådet · Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung · VINNOVA · Svenska Forskningsrådet Formas · Villum Fonden · DanScatt · U.S. Department of Energy · NanoLund, Lunds Universitet
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