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Nanostructured magnetic materials obtained by mechanical alloying/milling

V. POP1,* , I. CHICINAŞ2

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 4000480 Cluj-Napoca, Romania
  2. Materials Sciences and Technology Dept., Technical University of Cluj-Napoca, 103-105 Muncii ave., 400641 Cluj- Napoca, Romania

Abstract

Generally, polycrystalline solids with grain size less than 100 nm are called nanocrystalline materials. Nanomaterials behave differently from their macroscopic counterparts because their characteristic sizes are smaller than the characteristic length scales of physical phenomena occurring in bulk materials. Nanocrystalline structures offer a new opportunity to improve current magnetic materials. This refers to materials such as permanent magnets, soft magnetic materials, recording media and also to materials involved in spin electronics. The properties of nanocrystalline materials are very often superior to those of conventional polycrystalline coarse grain materials. These materials can be produced using various methods and different starting phases: vapour (inert gas condensation, sputtering, plasma processing, vapour deposition), liquid (electrodeposition, rapid solidification) or solid (mechanical alloying, severe plastic deformation, spark erosion). A survey on mechanical alloying and mechanical milling as methods to obtain nanostructured permanent magnets and soft magnetic materials will be presented. The influence of the annealing on the structure and microstructure is also discussed. Some of our results obtained in soft Ni-Fe based magnetic materials and in spring magnets type materials, obtained by mechanical alloying (soft magnetic materials) or by mechanical milling (spring magnets) and annealing, are presented..

Keywords

Soft magnetic materials, Spring magnets, Mechanical alloying/milling.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

V. POP, I. CHICINAŞ, Nanostructured magnetic materials obtained by mechanical alloying/milling, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1478-1491 (2007)