Particle size effects and surface anisotropy in Fe-based granular films

Chen Chen; Osamu Kitakami; Yutaka Shimada

doi:10.1063/1.368281

Particle size effects and surface anisotropy in Fe-based granular films

Chen Chen, Osamu Kitakami, Yutaka Shimada

Division of Inorganic Material Research

Research output: Contribution to journal › Article › peer-review

84 Citations (Scopus)

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 (H_c) shows a maximum around 600 Oe at the particle size d_m≈ 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 K_S≈0.4 erg/cm².

Original language	English
Pages (from-to)	2184-2188
Number of pages	5
Journal	Journal of Applied Physics
Volume	84
Issue number	4
DOIs	https://doi.org/10.1063/1.368281
Publication status	Published - 1998 Aug 15

ASJC Scopus subject areas

Physics and Astronomy(all)

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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 N{\'e}el-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.",

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N2 - 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.

AB - 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.

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