Millimeter Sized Ferromagnetic Fe-clusters: Formation by Mechanical Attrition, Microstructure and Magnetic Properties
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- Ram Shanker
- Materials Science Centre, Indian Institute of Technology
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- Jörg-Fecht Hans
- Faculty of Engineering, University of Ulm
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説明
Ferromagnetic Fe-clusters of millimeter size are fabricated by surface deformation and recombination of spherical Fe-particles (1–2 μm in diameter) by mechanical attrition in a pure argon. The morphology changed from spherical particles to clusters during a non-interrupted attrition for 50 h. The clusters are separated apart and have an ellipsoidal shape with a sharp size distribution. The particles in cluster are interconnected through a structurally disordered surface structure. A strong dipole-dipole (DD) interaction between the particles designs a reduced effective magnetic moment, μn=2.21μB per atom, in the clusters if compared with that in the individual particles (e.g., μn=2.30μB in 8–20 nm particles). An extended milling for 100 h, with 5 mass% addition of a volatile hydrocarbon liquid, recovers the disordered structure with a resolved and refined structure of 8–20 nm particles. The sample, which consists of single magnetic domain particles, exhibits a monotonically increasing value of coercivity Hc with a decrease of temperature from 300 to 12 K, with Hc=7.2 kA/m at 295 K and Hc=150 kA/m at 12 K. A similar temperature dependence of Hc, from 11.9 kA/m at 295 K to 191.7 kA/m at 12 K, appears in the clusters because of intracluster DD interactions. The results are discussed in relation to microstructure and modified magnetic anisotropies of the particles.
収録刊行物
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- Materials Transactions, JIM
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Materials Transactions, JIM 41 (7), 754-760, 2000
社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390001204245625856
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- NII論文ID
- 130003557394
- 10005352544
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- NII書誌ID
- AA10699969
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- COI
- 1:CAS:528:DC%2BD3cXmt1Onsrg%3D
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- ISSN
- 2432471X
- 09161821
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- NDL書誌ID
- 5470495
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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