http://repository.iitr.ac.in/handle/123456789/14070| Title: | Magnetic properties of silica coated spindle-type hematite particles |
| Authors: | Reufer M. Dietsch H. Gasser U. Grobety B. Hirt A.M. Malik, Vivek K. Schurtenberger P. |
| Published in: | Journal of Physics Condensed Matter |
| Abstract: | 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 super-paramagnetic 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. © 2011 IOP Publishing Ltd. |
| Citation: | Journal of Physics Condensed Matter (2011), 23(6): - |
| URI: | https://doi.org/10.1088/0953-8984/23/6/065102 http://repository.iitr.ac.in/handle/123456789/14070 |
| Issue Date: | 2011 |
| ISSN: | 9538984 |
| Author Scopus IDs: | 9638530500 23097064900 57203713454 6701916437 7006725735 24758795000 7004874512 |
| Author Affiliations: | Reufer, M., Adolphe Merkle Institute, Fribourg Center for Nanomaterials, University of Fribourg, 1723 Marly, Switzerland Dietsch, H., Adolphe Merkle Institute, Fribourg Center for Nanomaterials, University of Fribourg, 1723 Marly, Switzerland Gasser, U., Adolphe Merkle Institute, Fribourg Center for Nanomaterials, University of Fribourg, 1723 Marly, Switzerland, Laboratory for Neutron Scattering, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland Grobety, B., Department of Geosciences, Fribourg Center for Nanomaterials, University of Fribourg, 1700 Fribourg, Switzerland Hirt, A.M., Institute of Geophysics, ETH Zürich, 8092 Zürich, Switzerland Malik, V.K., Department of Physics, Fribourg Center for Nanomaterials, University of Fribourg, 1700 Fribourg, Switzerland Schurtenberger, P., Physical Chemistry, Department of Chemistry, Lund University, S-221 00 Lund, Sweden |
| Corresponding Author: | Reufer, M.; Adolphe Merkle Institute, Fribourg Center for Nanomaterials, University of Fribourg, 1723 Marly, Switzerland |
| Appears in Collections: | Journal Publications [PH] |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.