Critical exponents of NiFeV alloys for the ferromagnetic-paramagnetic phase transition

A systematic study of the magnetic critical exponents has been made in Ni-r ich NiFeV ternary alloys of compostions Ni77Fe7V16, Ni79Fe5V16 and Ni78Fe4V 18 in the critical region of ferromagnetic to paramagnetic (FM-PM) transiti on through detailed AC-susceptibiltiy and DC-magnetization measurements. In all the alloys, we have found a well-defined critical temperature T-C belo w which the spontaneous magnetization increases with decreasing temperature . The critical exponents and critical amplitudes associated with the transi tions are obtained. Their values show drastic changes from those of pure Ni . (C) 2000 Elsevier Science B.V. All rights reserved.