Magneto-Impedance measurements in thin films of the Spin-Glass Cu100-xMnxAu13.5 (x = 6.75 and 13.5) alloys

P. R.T. Ribeiro, F. L.A. Machado, D. C. Harrison, E. Dan Dahlberg, S. M. Rezende

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Abstract

Magneto-impedance measurements (MI) were carried out on thin-films of Cu100-xMnxAu13.5 (x = 6.75 and 13.5). The sample with × = 6.75 (13.5) undergoes a phase transition to a spin-glass state below a glass temperature of about TG = 31 K (55 K). The MI measurements were carried out for temperatures (T) from 300 K down to 5 K in applied magnetic fields in the range of ± 3.5 kOe and for an ac electric current with frequency of 9.0 MHz. Short-range interaction and spin-fluctuations yielded non-vanishing values for the MI data for all values of T. The transverse magnetic permeability (μT) was obtained for both sample compositions demonstrating that MI is a suitable technique to study canonical spin-glasses in the MHz regime. Moreover, it was observed that the spin-fluctuations in very short time scale (∼10−7 s) are important down to the lowest temperature investigated of 5 K. The transverse magnetic susceptibility, μT, showed a minimum near the freezing temperature.

Original languageEnglish (US)
Article number168537
JournalJournal of Magnetism and Magnetic Materials
Volume541
DOIs
StatePublished - Jan 1 2022

Bibliographical note

Funding Information:
This work was supported in Brazil by CNPq, CAPES, FACEPE and FINEP, and in the USA by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0013599.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • Magnetic materials
  • Magneto-impedance
  • Spin-glasses

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