Abstract
Structure and magnetic properties of Fe/SiO2 and Fe/Al2O3 granular films were studied in the particle size (d) range of 1-50 nm. The coercivity (Hc) shows a maximum around 600 Oe at the particle size dm≈ 18 nm, and then decreases in the larger particle size range for both Fe/SiO2 and Fe/Al2O3 systems at room temperature. A relation of coercivity, particle size, and temperature was built by using the Néel-Brown theory and the Stoner-Wohlfarth model basically. The experimental results were successfully fitted by assuming that the α-Fe particles possess uniaxial surface anisotropy KS≈0.4 erg/cm2.
Original language | English |
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Pages (from-to) | 2184-2188 |
Number of pages | 5 |
Journal | Journal of Applied Physics |
Volume | 84 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1998 Aug 15 |
ASJC Scopus subject areas
- Physics and Astronomy(all)