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Transmission electron microscopy and scanning electron microscopy (SEM) observations show that the Fe clusters in the assemblies maintain their original size at room temperature. In the SEM images, a random stacking of the Fe clusters and a porous structure with a low cluster packing fraction of about 25% are observed. For the Fe cluster assemblies, magnetic coercivity (Hc) at room temperature increases from 4×101 to 4×102 Oe by increasing the mean cluster size from 7.3 to 16.3 nm. Using the experimental values of the coercivity at T?100 K and the fitting values of blocking temperature TB from Hc=Hc0[1-(T/TB)1/2], we estimated the values of magnetic anisotropy constant K of the order of 106 erg/cm3 from TB=KV/25kB, which is larger by an order of magnitude than the bulk Fe value (5×105 erg/cm3). Such a large effective anisotropy at T?100 K is ascribed to the large surface anisotropy effects of the small clusters and the low cluster-packing fraction of the Fe cluster assemblies. For the oxide-coated Fe cluster samples, the coercivity strongly depends on the oxygen gas flow rate during deposition, cluster size, and temperature. 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Structural and magnetic characteristics of monodispersed Fe and oxide-coated Fe cluster assemblies
https://nitech.repo.nii.ac.jp/records/5088
https://nitech.repo.nii.ac.jp/records/5088bd1b6eb5-dba3-4207-868d-7772591c1a41
名前 / ファイル | ライセンス | アクション |
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本文_fulltext (682.8 kB)
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Copyright (2002) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.The following article appeared in Journal of Applied Physics, 92(6), pp.3075- 3083 ; 2002and may be found at http://link.aip.org/link/?jap/92/3075
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2012-11-06 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Structural and magnetic characteristics of monodispersed Fe and oxide-coated Fe cluster assemblies | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Peng, D. L.
× Peng, D. L.× Hihara, Takehiko× Sumiyama, Kenji× Morikawa, H. |
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著者別名 | ||||||
姓名 | 日原, 岳彦 | |||||
著者別名 | ||||||
姓名 | 隅山, 兼治 | |||||
書誌情報 |
JOURNAL OF APPLIED PHYSICS 巻 92, 号 6, p. 3075-3083, 発行日 2002-09-15 |
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出版者 | ||||||
出版者 | American Institute of Physics | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00218979 | |||||
書誌レコードID(NCID) | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00693547 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | http://dx.doi.org/10.1063/1.1501754 | |||||
関連名称 | 10.1063/1.1501754 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We systematically studied structural and magnetic characteristics of size- monodispersed Fe and oxide-coated Fe cluster assemblies with the mean cluster sizes of 7-16 nm. Transmission electron microscopy and scanning electron microscopy (SEM) observations show that the Fe clusters in the assemblies maintain their original size at room temperature. In the SEM images, a random stacking of the Fe clusters and a porous structure with a low cluster packing fraction of about 25% are observed. For the Fe cluster assemblies, magnetic coercivity (Hc) at room temperature increases from 4×101 to 4×102 Oe by increasing the mean cluster size from 7.3 to 16.3 nm. Using the experimental values of the coercivity at T?100 K and the fitting values of blocking temperature TB from Hc=Hc0[1-(T/TB)1/2], we estimated the values of magnetic anisotropy constant K of the order of 106 erg/cm3 from TB=KV/25kB, which is larger by an order of magnitude than the bulk Fe value (5×105 erg/cm3). Such a large effective anisotropy at T?100 K is ascribed to the large surface anisotropy effects of the small clusters and the low cluster-packing fraction of the Fe cluster assemblies. For the oxide-coated Fe cluster samples, the coercivity strongly depends on the oxygen gas flow rate during deposition, cluster size, and temperature. In the case of a high oxygen gas flow rate (namely high surface-oxidized clusters), the ferrimagnetic oxide shell crystallites also affect the coercivity at T>50 K: The hysteresis loop shift disappears, leading to a complex change in the coercivity and an enhancement of the effective anisotropy constant. | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf |