Magnetic microstructure of YFe11Ti aggregates

被引：5
作者：
Nunes, D. [1 ]
Colaco, R. [2 ]
de Hosson, J. Th. M.
Gonclves, A. P. [3 ]
Pereira, L. C. J. [3 ]
Carvalho, P. A. [1 ]
机构：
[1] Univ Tecn Lisboa, Inst Super Tecn, Dept Mat Engn, P-10491000 Lisbon, Portugal
[2] Univ Groningen, Dept Appl Phys, NL-9747 AG Groningen, Netherlands
[3] CFMC UL, Inst Tecnol & Nucl, Dept Chem, P-2686953 Sacavem, Portugal
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 487卷 / 1-2期
关键词：
Rare-earth alloys and compounds; Microstructure; Magnetic domain structure; Transmission electron microscopy; Lorentz microscopy; Magnetic force microscopy; RFE11TI INTERMETALLIC COMPOUNDS; THERMAL-EXPANSION; SINGLE-CRYSTALS; DOMAIN-STRUCTURES; THMN12; STRUCTURE; PHASE; SMFE11TI; SM; MAGNETOSTRICTION; ANISOTROPY;
D O I：
10.1016/j.jallcom.2009.07.150
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructure and magnetic domain configuration of splat-quenched YFe11Ti aggregates have been investigated by transmission electron microscopy, Lorentz microscopy and magnetic force microscopy. The splat-quenched material adopted essentially the ThMn12-type structure and displayed an equiaxed polycrystalline microstructure with a scattered presence of alpha-Fe(Ti). Lorentz microscopy and magnetic force microscopy showed that the critical size for single-domain behaviour in the splat-quenched aggregates is close to 100 nm. Annealing induced a decrease in coercivity justified by overall grain coarsening and additional alpha-Fe(Ti) formation. Lorentz microscopy evidenced stripe/maze patterns in coarse YFe11Ti grains; while coarse alpha-Fe(Ti) grains exhibited vortex configurations resulting from accommodation to the demagnetizing fields of adjacent YFe11Ti grains. Planar defects with twin appearance and thermal antiphase boundaries have been observed in YFe11Ti grains but showed no interaction with domain walls. On the other hand, grain boundaries and in particular grain-boundary triple joints exhibited a moderate pinning effect. (C) 2009 Elsevier B.V. All rights reserved.
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页码：11 / 17
页数：7
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