| Magnetic properties of silica coated spindle-type hematite particles. | |
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MedLine Citation:
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PMID: 21406920 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Magnetic properties of particles are generally determined from randomly oriented ensembles and the influence of the particle orientation on the magnetic response is neglected. Here, we report on the magnetic characterization of anisotropic spindle-type hematite particles. The easy axis of magnetization is within the basal plane of hematite, which is oriented perpendicular to the spindle axis. Two standard synthesis routes are compared and the effects of silica coating and particle orientation on the magnetic properties are investigated. Depending on the synthesis route we find fundamentally different magnetic behavior compatible with either single domain particles or superparamagnetic sub-units. Furthermore, we show that silica coating reduces the mean blocking temperature to nearly room temperature. The mechanical stress induced by the silica coating appears to reduce the magnetic coupling between the sub-units. |
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Authors:
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M Reufer; H Dietsch; U Gasser; B Grobety; A M Hirt; V K Malik; P Schurtenberger |
Publication Detail:
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Type: Journal Article Date: 2011-01-24 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 23 ISSN: 0953-8984 ISO Abbreviation: J Phys Condens Matter Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-03-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: England |
Other Details:
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Languages: eng Pagination: 065102 Citation Subset: IM |
Affiliation:
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Adolphe Merkle Institute and Fribourg Center for Nanomaterials, University of Fribourg, 1723 Marly, Switzerland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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