書誌事項
- タイトル別名
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- Long-Range Order Parameter of L10-Type FePd Ordered Alloy Nanoparticles
- L1oガタ FePd キソク ゴウキン ナノ リュウシ ノ チョウハンイ キソクド
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抄録
Hard magnetic properties of FePd nanoparticles originate from their L10-type tetragonal ordered structure with high magnetocrystalline anisotropy energy. In order to know correlations among the long-range order (LRO) parameter (S), the particle size and the anisotropy energy, we employed a new technique to determine LRO parameter of single L10-FePd nanoparticle using nanobeam electron diffraction (NBD) . The LRO parameter was determined by quantitative analysis of NBD intensities recorded on imaging plates together with intensity calculations considering the multiple scattering of electrons. In taking NBD patterns, hh0 systematic reflections were excited using a transmission electron microscope with a field emission gun operated at 300 kV. Specimen thickness was evaluated by electron holography. The obtained order parameters of individual nanoparticles larger than 8 nm are almost around the mean LRO parameter (S=0.79) determined by selected area electron diffraction. In contrast, the parameters gradually decrease as the particle size decreases below 8 nm (S=0.60-0.73) . The low degree of order in very small particles is responsible for the coercivity (anisotropy energy) decrease of the L10 nanoparticles in smaller sized region. Experimental conditions required for NBD analysis are presented in detail and the possible experimental errors of the determined LRO parameters are discussed.
収録刊行物
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- 日本結晶学会誌
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日本結晶学会誌 50 (4), 262-268, 2008
日本結晶学会
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詳細情報 詳細情報について
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- CRID
- 1390282679063248256
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- NII論文ID
- 10024283110
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- NII書誌ID
- AN00188364
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- COI
- 1:CAS:528:DC%2BD1cXhtFelsL3I
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- ISSN
- 18845576
- 03694585
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- NDL書誌ID
- 9643457
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- KAKEN
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- 抄録ライセンスフラグ
- 使用不可