Title :
Anisotropy and FOMP in (SmxPr1-x)3Fe27.5Ti1.5 (x=0-1) and Pr3(Fe1-yCoy)27.5Ti1.5 (y=0-0.4) compounds
Author :
Markandeyulu, G. ; Shah, V.R. ; Rao, K. V S Rama ; Huang, M.Q. ; Sirisha, K. ; McHenry, M.E. ; Ramanan, V.R.V.
Author_Institution :
Dept. of Phys., Indian Inst. of Technol., Madras, India
fDate :
7/1/2001 12:00:00 AM
Abstract :
Alloys of composition (SmxPr1-x)3Fe27.5Ti1.5 (x=0-1) and Pr3(Fe1-yCoy)27.5Ti1.5 (y=0-0.4) were synthesized and characterized in the temperature range of 10-1273 K in fields up to 5 T. The magnetization curves along the hard direction clearly indicate the presence of a type II FOMP (first order magnetization processes) below 200 K. The critical fields H cr at which FOMP is observed, have been determined from the occurrence of a maximum in dM/dH as a function of H. For (SmxPr1-x)3Fe27.5Ti1.5 compounds, Hcr is the largest (4.4 T at 5-10 K) for the x=0 composition, and the lowest (1.4 T at 5-10 K) for the x=0.5 composition. For the Pr3(Fe1-yCoy)27.5Ti1.5 compounds, the Hcr are about 3.6 T at 5-10 K for y=0 and 0.1 whereas, Hcr is seen to decrease monotonically for higher Co contents. The FOMP exhibits a strong monotonically decreasing temperature dependence for both systems. The effects of the R sublattice (Sm and Pr) and the 3d sublattice (Fe and Co) on the anisotropy and FOMP are reported
Keywords :
cobalt alloys; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetisation; praseodymium alloys; samarium alloys; titanium alloys; (SmxPr1-x)3Fe27.5Ti 1.5; (SmPr)3Fe27.5Ti1.5; 10 to 1273 K; 5 T; Pr3(Fe1-yCoy)27.5Ti 1.5; Pr3(FeCo)27.5Ti1.5; critical field; first order magnetization process; magnetic anisotropy; rare earth-transition metal intermetallic compound; temperature dependence; Anisotropic magnetoresistance; Cobalt alloys; Iron alloys; Magnetic anisotropy; Magnetization processes; Perpendicular magnetic anisotropy; Samarium alloys; Superconducting magnets; Temperature distribution; Titanium alloys;
Journal_Title :
Magnetics, IEEE Transactions on
