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Magnetic and structural behaviour of Nd2Fe14B/α-Fe and (NdDy)2Fe14B/ α-Fe obtained by mechanical milling and annealing

S. GUTOIU1, E. DOROLTI1, O. ISNARD2, I. CHICINAŞ3, V. POP1,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania
  2. Institut Néel, CNRS, University Joseph Fourier de Grenoble, BP 166X, 38042 Grenoble, Cédex 9, France
  3. Materials Sciences and Technology Dept., Technical University of Cluj-Napoca, 103-105 Muncii ave., 400641 ClujNapoca, Romania

Abstract

Two type of nanocomposite Nd2Fe14B+10 wt % α-Fe and (Nd0.92Dy0.08)2Fe14B+22 wt % α-Fe were prepared by high energy ball milling and subsequent annealing under high vacuum at different temperatures and annealing times. X-ray diffraction followed by electron microscopy were used to evidenced the evolution of the structure and microstructure of the samples. The width of the diffraction peaks of the hard magnetic phase increases with milling times and disappears after 12 h of milling. The remanent magnetisation, the coercive field and the exchange coupling between the hard and the soft magnetic phases were deduced from room temperature magnetic hysteresis loops, performed in magnetic fields up to 10 T..

Keywords

Soft/hard nanocomposite, Mechanical milling, Exchange-coupling, Coercivity.

Submitted at: Sept. 4, 2010
Accepted at: Oct. 14, 2010

Citation

S. GUTOIU, E. DOROLTI, O. ISNARD, I. CHICINAŞ, V. POP, Magnetic and structural behaviour of Nd2Fe14B/α-Fe and (NdDy)2Fe14B/ α-Fe obtained by mechanical milling and annealing, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 10, pp. 2126-2131 (2010)