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Nanocomposite (Nd, Dy)2Fe14B/α-Fe magnetic materials coupled by exchange interactions

E. DOROLTI1, V. POP1,* , O. ISNARD2, D. GIVORD3, I. CHICINAŞ2,4

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 4000480 Cluj-Napoca, Romania
  2. Laboratoire de Cristallographie, CNRS, BP166, University J. Fourier, 38042 Grenoble, Cédex 9, France
  3. Laboratoire de Magnétisme Louis Néel, CNRS, BP166, F-38042 Grenoble, Cédex 9, France
  4. Materials Sciences and Technology Dept., Technical University of Cluj-Napoca, 103-105 Muncii ave., 400641 Cluj- Napoca, Romania

Abstract

The structural and magnetic properties of (Nd0.92Dy0.08)2Fe14B/α-Fe nanocomposite obtained by mechanical milling and subsequent annealing have been investigated. The structural evolution of the sample was followed versus the milling and annealing conditions by X-ray diffraction. The width of the diffraction peaks of the magnetic phase was found to increase with milling time and the peaks almost disappeared after 12 hours of milling. The characteristic diffraction peaks of the (Nd0.92Dy0.08)2Fe14B phase are restored during subsequent heat treatment. The coercive field, remanent magnetization and the degree of the exchange coupling between the hard magnetic gains and the soft grains are dependent on the milling time and the annealing conditions. The exchange coupling between the soft magnetic α-Fe, and the hard magnetic (Nd,Dy)2Fe14B-type phase is analysed..

Keywords

Nanocomposite magnetic materials, (Nd, Dy)2Fe14B/α-Fe, Exchange interactions.

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

Citation

E. DOROLTI, V. POP, O. ISNARD, D. GIVORD, I. CHICINAŞ, Nanocomposite (Nd, Dy)2Fe14B/α-Fe magnetic materials coupled by exchange interactions, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1474-1477 (2007)