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Remanence Plots as ...
Remanence Plots as a Probe of Spin Disorder in Magnetic Nanoparticles
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- De Toro, José A. (author)
- Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain
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- Vasilakaki, Marianna (author)
- NCSR Demokritos, Inst Nanosci & Nanotechnol, Athens 15310, Greece
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- Lee, Su Seong (author)
- Inst Bioengn & Nanotechnol, 31 Biopolis Way, Singapore 138669, Singapore
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- Andersson, Mikael (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Normile, Peter S. (author)
- Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain
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- Yaacoub, Nader (author)
- Univ Maine, CNRS, UMR 6283, Inst Mol & Mat Mans, F-72085 Le Mans, France
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- Murray, Peyton (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
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- Sanchez, Elena H. (author)
- Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain
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- Muñiz, Pablo (author)
- Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain
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- Peddis, Davide (author)
- CNR, Ist Struttura Mat, I-00015 Monterotondo Scale, RM, Italy
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- Mathieu, Roland (author)
- Uppsala universitet,Fasta tillståndets fysik
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- Liu, Kai (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
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- Geshev, Julian (author)
- Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
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- Trohidou, Kalliopi N. (author)
- NCSR Demokritos, Inst Nanosci & Nanotechnol, Athens 15310, Greece
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- Nogués, Josep (author)
- CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain.;Barcelona Inst Sci & Technol, Campus UAB, Barcelona 08193, Spain.;ICREA, Pg Lluis Co 23, Barcelona 08010, Spai
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Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain NCSR Demokritos, Inst Nanosci & Nanotechnol, Athens 15310, Greece (creator_code:org_t)
- 2017-10-02
- 2017
- English.
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In: Chemistry of Materials. - Washington, D.C., USA : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 29:19, s. 8258-8268
- Related links:
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https://ddd.uab.cat/...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Remanence magnetization plots (e.g., Henkel or delta M plots) have been extensively used as a straightforward way to determine the presence and intensity of dipolar and exchange interactions in assemblies of magnetic nanoparticles or single domain grains. Their evaluation is particularly important in functional materials whose performance is strongly affected by the intensity of interparticle interactions, such as patterned recording media and nanostructured permanent magnets, as well as in applications such as hyperthermia and magnetic resonance imaging. Here, we demonstrate that delta M plots may be misleading when the nanoparticles do not have a homogeneous internal magnetic configuration. Substantial dips in the delta M plots of gamma-Fe2O3 nanoparticles isolated by thick SiO2 shells indicate the presence of demagnetizing interactions, usually identified as dipolar interactions. results, however, demonstrate that it is the inhomogeneous spin structure of the nanoparticles, as most clearly evidenced by Mossbauer measurements, that has a pronounced effect on the delta M plots, leading to features remarkably similar to those produced by dipolar interactions. X-ray diffraction results combined with magnetic characterization indicate that this inhomogeneity is due to the presence of surface structural (and spin) disorder. Monte Carlo simulations unambiguously corroborate the critical role of the internal magnetic structure in the delta M plots. Our findings constitute a cautionary tale on the widespread use of remanence plots to assess interparticle interactions as well as offer new perspectives in the use of Henkel and delta M plots to quantify the rather elusive inhomogeneous magnetization states in nanoparticles.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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De Toro, José A.
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Vasilakaki, Mari ...
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Lee, Su Seong
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Andersson, Mikae ...
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Normile, Peter S ...
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Yaacoub, Nader
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show more...
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Murray, Peyton
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Sanchez, Elena H ...
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Muñiz, Pablo
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Peddis, Davide
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Mathieu, Roland
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Liu, Kai
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Geshev, Julian
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Trohidou, Kallio ...
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Nogués, Josep
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Chemistry of Mat ...
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Uppsala University