Microstructural Changes Influencing the Magnetoresistive Behavior of Bulk Nanocrystalline Materials

Abstract

Bulk nanocrystalline materials of small and medium ferromagnetic content were produced using severe plastic deformation by high-pressure torsion at roomtemperature. Giant magnetoresistive behavior was found for as deformed materials, which was further improved by adjusting the microstructure with thermal treatments. The adequate range of annealing temperatures was assessed with in-situ synchrotron diffraction measurements. Thermally treated CuCo materials show larger giant magnetoresistance after annealing for 1 h at 300C, while for CuFe this annealing temperature is too high and decreases the magnetoresistive properties. The improvement of magnetoresistivity by thermal treatments is discussed with respect to the microstructural evolution as observed by electron microscopy and ex situ synchrotron diffraction measurements.

References in corpus (6)

• Phase separation of a supersaturated nanocrystalline Cu Co alloy and its influence on thermal stability
• Magnetic Binary Supersaturated Solid Solutions Processed by Severe Plastic Deformation
• Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC- and AC-SQUID susceptometry and atom probe tomography
• Magnetic dilution by severe plastic deformation
• On the magnetic nanostructure of a Co-Cu alloy processed by high-pressure torsion
• Tuneable Magneto-Resistance by Severe Plastic Deformation

Cited by in corpus (5)

• Sampling the Cu-Fe-Co phase diagram by severe plastic deformation for enhanced soft magnetic properties
• On the magnetic nanostructure of a Co-Cu alloy processed by high-pressure torsion
• Oxide-stabilized microstructure of severe plastically deformed CuCo alloys
• In situ AC-hysteresis measurements of SPD-processed Cu20(Fe15Co85)80
• Magnetoresistive behaviour of ternary Cu-based materials processed by high-pressure torsion