Magnetic properties and Curie temperature tuning in copper-Permalloy alloys obtained by electrodeposition

Permalloy copper (CuPy) structures, produced by low cost vacuum free pulsed electrodeposition technique, present relevant results as magnetic material properties hardening and Curie temperature decay in function of Cu concentration. Such properties modification are here related to the slight crystalline phase shift of face cubic centered (FCC) structure to lower angles, evidenced by X-ray measurements, with lattice parameter increase and successively magnetization weakening by Ni atoms substitution by Cu. The fine tuning of Curie temperature decrease reported here, Tc approximate to 800K from pure Permalloy to Tc approximate to 380K for alloy with 67% of Cu, could allow utilization of such technique to develop magnetic sensors and memories with thermal activation achieved near room temperature.

Automated summary

Permalloy copper (CuPy) structures prepared by low cost vacuum free pulsed electrodeposition technique show improved magnetic material properties and reduced Curie temperature, making them suitable for the development of magnetic sensors and memories operating near room temperature.