The effect of Co on the magnetic properties of the off stoichiometric YGdFe 17-x Co x Ga compounds are presented. The lattice parameters, saturation magnetization and Curie temperature of the compound were obtained. Structural characterization was carried out by taking X-ray diffraction patterns on sample powders. Magnetization and Curie temperatures were determined using a vibrating sample magnetometer up to an applied field of 12 kOe.

G. Markandeyulu

Department Of Physics

R. Srilatha

V. S. Murty

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Effect of Co on the magnetic properties of YGdFe17Ga

INTERMAG 2006 - IEEE International Magnetics Conference

The effect of GaAl substitution on the structural and magnetic properties of YGdFe17 has been investigated. A structural transformation from hexagonal to rhombohedral has been observed. The saturation magnetization increases up to x= 1 (Ga)2 (Al) and then decreases with further increase of x. Curie temperature increases from 476 K for YGdFe17 to 595 K for YGdFe14Ga3 and 495 K for YGdFe14Al3 and decreases with further substitution of GaAl. The easy magnetization direction is planar up to x=6 for Ga- and 7 for Al-substituted compounds and shifts to along c axis for x=8. © 2005 American Institute of Physics.

Fulltext

Journal of Applied Physics

Magnetic properties of YGdFe 17-x(Ga,Al) x (x=0-8)

The alloys ErPrFe17-xGax and ErPrFe17-xSix (x = 0-3.5) have been prepared and their structure and magnetization have been investigated. Powder X-ray diffraction patterns show that these compounds crystallize in hexagonal Th2Ni17 (2:17) structure. The lattice parameters are found to increase as the Ga concentration is increased and decrease with increase of Si concentration. The saturation magnetization (Ms) measured at 20 K is found to increase initially and then decrease as the Ga and Si concentration are increased beyond 0.1. The Curie temperatures of ErPrFe15Ga3.5 and ErPrFe15Si3.5 are 528 and 537 K which are 241 and 250 K, respectively, higher than that of the parent compound ErPrFe17 and this has been explained on the basis of band model. The X-ray diffraction patterns taken for the magnetically aligned samples suggest that the easy magnetization direction (EMD) is in the basal plane in the Si substituted samples whereas in the case of the Ga substituted samples the EMD tend to be away from the basal plane. The anisotropy fields (HA) calculated from the magnetization measurements on aligned samples show that in the case of the Ga substituted compounds there is a significant increase in HA compared to the ones that are seen in the Si substituted compounds. © 2002 Elsevier Science B.V. All rights reserved.

Journal of Alloys and Compounds

Structural and magnetic properties of ErPrFe17-xMx (M = Ga, Si; x = 0-3.5)

Structural and magnetic properties of Sm2Fe17−xTxM (T=Co, Ti; M=Al, Si) compounds

Band theoretical investigation of the Curie temperatures of modified R2Fe17-based intermetallic compounds

Reports on Progress in Physics

New developments in hard magnetic materials

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