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Title: Correlated spin canting in ordered core-shell Fe 3 O 4 / Mn x Fe 3 - x O 4 nanoparticle assemblies

Abstract

Polarization-analyzed small-angle neutron-scattering methods are used to determine the spin arrangements and experimental length scales of magnetic correlations in ordered three-dimensional assemblies of ~7.4-nm-diam core-shell Fe3O4/MnxFe3–xO4 nanoparticles. In moderate to high magnetic fields, the assemblies display a canted magnetic structure where the canting direction is coherent from nanoparticle to nanoparticle, in contrast to the less extended, more single-particle-like behavior for similar ferrite assemblies. The observed magnetic scattering is modeled by assuming that the interparticle dipolar coupling combined with Zeeman effects in a field leads to nanoparticle domains with preferred net spin alignments relative to packing symmetry axes. Over a range of fields and temperatures, the model qualitatively explains the observed scattering anomalies in terms of clusters that vary in area and thickness, highlighting the complex structures adopted in real, dense nanoparticle systems. Here, the clusters often have a strong two-dimensional magnetic character which is attributed to structural stacking faults and the resulting influence of interparticle dipolar interactions for these magnetically soft nanoparticles.

Authors:
 [1];  [2];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [4]
+ Show Author Affiliations
  1. Oberlin College, OH (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609974
Alternate Identifier(s):
OSTI ID: 1501689
Grant/Contract Number:  
FG02-08ER46481; SC0019237
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics; magnetic interactions; magnetic order; magnetic nanoparticles; small angle neutron scattering

Citation Formats

Ijiri, Yumi, Krycka, K. L., Hunt-Isaak, I., Pan, H., Hsieh, J., Borchers, J. A., Rhyne, J. J., Oberdick, S. D., Abdelgawad, A., and Majetich, S. A. Correlated spin canting in ordered core-shell Fe3O4/MnxFe3-xO4 nanoparticle assemblies. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.094421.
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Ijiri, Yumi, Krycka, K. L., Hunt-Isaak, I., Pan, H., Hsieh, J., Borchers, J. A., Rhyne, J. J., Oberdick, S. D., Abdelgawad, A., & Majetich, S. A. Correlated spin canting in ordered core-shell Fe3O4/MnxFe3-xO4 nanoparticle assemblies. United States. https://doi.org/10.1103/physrevb.99.094421
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Ijiri, Yumi, Krycka, K. L., Hunt-Isaak, I., Pan, H., Hsieh, J., Borchers, J. A., Rhyne, J. J., Oberdick, S. D., Abdelgawad, A., and Majetich, S. A. Mon . "Correlated spin canting in ordered core-shell Fe3O4/MnxFe3-xO4 nanoparticle assemblies". United States. https://doi.org/10.1103/physrevb.99.094421. https://www.osti.gov/servlets/purl/1609974.
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@article{osti_1609974,
title = {Correlated spin canting in ordered core-shell Fe3O4/MnxFe3-xO4 nanoparticle assemblies},
author = {Ijiri, Yumi and Krycka, K. L. and Hunt-Isaak, I. and Pan, H. and Hsieh, J. and Borchers, J. A. and Rhyne, J. J. and Oberdick, S. D. and Abdelgawad, A. and Majetich, S. A.},
abstractNote = {Polarization-analyzed small-angle neutron-scattering methods are used to determine the spin arrangements and experimental length scales of magnetic correlations in ordered three-dimensional assemblies of ~7.4-nm-diam core-shell Fe3O4/MnxFe3–xO4 nanoparticles. In moderate to high magnetic fields, the assemblies display a canted magnetic structure where the canting direction is coherent from nanoparticle to nanoparticle, in contrast to the less extended, more single-particle-like behavior for similar ferrite assemblies. The observed magnetic scattering is modeled by assuming that the interparticle dipolar coupling combined with Zeeman effects in a field leads to nanoparticle domains with preferred net spin alignments relative to packing symmetry axes. Over a range of fields and temperatures, the model qualitatively explains the observed scattering anomalies in terms of clusters that vary in area and thickness, highlighting the complex structures adopted in real, dense nanoparticle systems. Here, the clusters often have a strong two-dimensional magnetic character which is attributed to structural stacking faults and the resulting influence of interparticle dipolar interactions for these magnetically soft nanoparticles.},
doi = {10.1103/physrevb.99.094421},
journal = {Physical Review B},
number = 9,
volume = 99,
place = {United States},
year = {Mon Mar 18 00:00:00 EDT 2019},
month = {Mon Mar 18 00:00:00 EDT 2019}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/physrevb.99.094421
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Cited by: 23 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of the composition of the core-shell nanoparticles, (b) organized into face-centered cubic close-packed clusters for magnetic modeling, (c) each with different possible orientation (indicated by angles $ψ, ω$, and $\Phi$) relative to an applied field along X (in red). Arrows within the depicted close-packed region inmore » (c) denote expected six-fold easy symmetry axes; the thicker (yellow) pair indicate the set closest to the applied field direction in this instance. The stacking of the layers is FCC to match the observed structural ordering. The direction of magnetization $\vec{M}$ is determined in the model by the energy minimum between alignment in the plane (black or yellow arrows) and along the field direction (red arrow). Inset (d) shows a TEM image of self-assembled monolayers and bilayers of the nanoparticles and the presence of dislocations and faults in the ordering.« less
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    Works referencing / citing this record:

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      FIG. 8 (p. 17)figure
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