Title :
Magnetoresistance and magnetization of melt-spun Dy-Cu alloys
Author :
Müller, K-H ; Idzikowski, B. ; Eckert, D. ; Nenkov, K. ; Engelmann, H.-J. ; Teresiak, A. ; Wolf, M.
Author_Institution :
Inst. fur Festkorper- und Werkstofforschung Dresden, Germany
fDate :
9/1/1997 12:00:00 AM
Abstract :
At low temperatures melt-spun and subsequently annealed ribbons with the nominal composition DyxCu100-x (x<20) show a remarkable magnetoresistance ratio which is negative and isotropic. This effect is caused by the cubic DyCu5 phase with the AuBe5-type structure. Below a critical temperature T m≈7 K this phase is metamagnetic. Between Tm and Tc=14.5 K it shows a spontaneous magnetization i.e. it is ferromagnetic. The hexagonal DyCu7 phase (TbCu7-type structure) is ferromagnetic with a Curie temperature of about 18 K. This 1:7 phase as well as the lamellar Cu/DyCu5 microstructure caused by the eutectoid decomposition of DyCu7 do not result in a large magnetoresistance of the ribbons
Keywords :
Curie temperature; annealing; copper alloys; dysprosium alloys; ferromagnetic materials; magnetic transition temperature; magnetoresistance; metamagnetism; spontaneous magnetisation; 14.5 K; 7 K; Dy-Cu; annealed ribbon; critical temperature; eutectoid decomposition; ferromagnetic; hexagonal DyCu7 phase; lamellar Cu/DyCu5 microstructure; large magnetoresistance; magnetization; magnetoresistance; melt-spun Dy-Cu alloys; nominal composition; spontaneous magnetization; Annealing; Electrical resistance measurement; Electrons; Enhanced magnetoresistance; Giant magnetoresistance; Magnetic field measurement; Magnetic materials; Magnetic properties; Magnetization; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
