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

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3565

Lastpage

3567

Abstract

At low temperatures melt-spun and subsequently annealed ribbons with the nominal composition Dy_xCu_100-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 T_m and T_c=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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619499

Filename

619499