Switching field distribution of magnetic fine particles |
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| Affiliation: | 1. Bundesanstalt für Materialforschung und –prüfung (BAM), Unter Den Eichen 87, 12205 Berlin, Germany;2. Microwave Physics and Dielectrics Dept. of National Research Centre (NRC), 33 El Behouth St., Dokki, Giza, P.O.12622, Egypt;3. Packing and Packaging Materials Dept. of National Research Centre (NRC), 33 El Behouth St., Dokki, Giza, P.O.12622, Egypt;1. Department of Physics, Faculty of Science, Beirut Arab University, P.O. Box 11-5020 Riad El Solh, Beirut, Lebanon;2. Department of Chemistry, Faculty of Science, Beirut Arab University, P.O. Box 11-5020 Riad El Solh, Beirut, Lebanon;3. Department of Physics, Faculty of Science, Alexandria University, P.O. Box 21511, Egypt;1. Department of Materials and Ceramic Engineering / CICECO, Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal;2. Department of Physics / CICECO, Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal |
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| Abstract: | In the magnetic recording media the switching field distribution (SFD) is an important micromagnetic characteristic curve. However, in general case, methods of assessing SFD have not presented a reasonable relation between the macroscopic measurements and the microscopic properties of the system. The degree of alignment of particles easy axis in a texture and the angular dependence of switching field are two fundamental factors for the distribution function. A technique for determining the switching field distribution curve due to these factors is reported. This technique is performed for textured iron fine particles and samples of CrO2 and γFe2O3 commercial tapes. The distribution differs from a gaussian function. However, the width and the mean switching field equal to twice of the width of dMr/dH curve and the remanent coercivity, respectively. Furthermore, it is shown that the width of the switching field distribution decreases with increasing the degree of easy axis orientation. |
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