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

86 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)

Access to Document

10.1063/1.368281

Cite this

@article{5ffcd9897e734f409d1f794415e2e033,

title = "Particle size effects and surface anisotropy in Fe-based granular films",

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.",

author = "Chen Chen and Osamu Kitakami and Yutaka Shimada",

year = "1998",

month = aug,

day = "15",

doi = "10.1063/1.368281",

language = "English",

volume = "84",

pages = "2184--2188",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

number = "4",

}

TY - JOUR

T1 - Particle size effects and surface anisotropy in Fe-based granular films

AU - Chen, Chen

AU - Kitakami, Osamu

AU - Shimada, Yutaka

PY - 1998/8/15

Y1 - 1998/8/15

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.

UR - http://www.scopus.com/inward/record.url?scp=0000725269&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000725269&partnerID=8YFLogxK

U2 - 10.1063/1.368281

DO - 10.1063/1.368281

M3 - Article

AN - SCOPUS:0000725269

VL - 84

SP - 2184

EP - 2188

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 4

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this