Title :
Giant magnetoresistance in intermetallics
Author :
Sechovsky, Vladimir ; Havela, Ladislav ; Nakotte, Heinrich ; Brück, Ekkehard
Author_Institution :
Dept. of Metal Phys., Charles Univ., Prague, Czech Republic
fDate :
9/1/1996 12:00:00 AM
Abstract :
Some typical examples of large magnetoresistance effects observed in intermetallic compounds are reviewed and briefly compared with the giant magnetoresistance (GMR) of magnetic multilayers. Basically, the large magnetoresistance changes are observed at metamagnetic transitions in two classes of intermetallics, antiferromagnetics and spin fluctuators. In the former case, a metamagnetic-transition is connected with the suppression of the antiferromagnetic coupling between magnetic moments as discussed with several examples of f-electron materials (NdGa 2, UNiGa and other UTX antiferromagnets). The latter class is represented by the RCo2 compounds in which a large resistivity drop is connected with the formation and ferromagnetic ordering of Co magnetic moments, which leads to the suppression of the spin fluctuation scattering of conduction electrons. In FeRh based alloys we observe combination of both phenomena, the suppression of antiferromagnetic coupling in the Fe sublattice and the formation of Rh moments. The possibilities of tuning the material parameters desired for applications are discussed with several examples of SmMn2Ge 2, Ce(Fe,T)2, Ce(Fe,X)2, (Mn,T)2 Sb and MnPtAl
Keywords :
antiferromagnetic materials; cobalt alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic moments; magnetic multilayers; magnetic transitions; rare earth alloys; spin fluctuations; (Mn,T)2Sb; Ce(Fe,T)2; Ce(Fe,X)2; Co magnetic moments; FeRh based alloys; MnPtAl; NdGa2; RCo2 compounds; SmMn2Ge2; UNiGa; antiferromagnetic coupling suppression; antiferromagnetics; conduction electrons; f-electron materials; giant magnetoresistance; intermetallics; large magnetoresistance effects; magnetic multilayers; metamagnetic transitions; metamagnetic-transition; spin fluctuation scattering; spin fluctuators; Antiferromagnetic materials; Conductivity; Couplings; Fluctuations; Giant magnetoresistance; Intermetallic; Magnetic materials; Magnetic moments; Magnetic multilayers; Scattering;
Journal_Title :
Magnetics, IEEE Transactions on
