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

• Published in: Journal of magnetism and magnetic materials Vol. 561; p. 169702
• Main Authors: Teixeira, H.A., Araujo, C.I.L. de
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2022
• Subjects: Alloy; Curie temperature; Electrodeposition; Permalloy; Phase change; Thermoactivation; Electrodeposition; Thermoactivation; Permalloy; Alloy; Phase change; Curie temperature
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.169702

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≈800K from pure Permalloy to Tc≈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.
•Low cost and vacuum free technique to obtain thermal activated magnetic alloys.•Magnetic characterization showing magnetic properties hardening with Cu insertion.•Decrease in Curie temperature in function of non-magnetic impurities in the alloy.•Possible application in magnetic memories and sensors thermally activated.