Determining the AC susceptibility of thin metal films using the anisotropic magnetoresistance

Kevin Booth, Isaiah Gray, E. Dan Dahlberg

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The differential ac magnetic susceptibility of thin magnetic films was determined using the anisotropic magnetoresistance (AMR) to measure the response of the magnetization to an applied AC magnetic field. The differential AMR was measured with a small AC magnetic field (1 Oe) at frequencies from 5 Hz to 5000 Hz as a function of the magnitude of an applied DC field that was varied from −60 Oe to +60 Oe. A model relating the magnitude of the differential AMR to the differential AC susceptibility was developed. The ferromagnetic films investigated were permalloy, cobalt, nickel, and nickel with an antiferromagnetic nickel oxide layer on one surface. For all the samples investigated, the differential susceptibility magnitude was a function of the DC field magnitude and was frequency dependent, decreasing with increasing frequency.

Original languageEnglish (US)
Article number167631
JournalJournal of Magnetism and Magnetic Materials
StatePublished - Apr 1 2021

Bibliographical note

Funding Information:
This work was supported by NSF GRANT DMR 1609782.

Publisher Copyright:
© 2020


  • Anisotropic magnetoresistance
  • Magnetic susceptibility
  • Thin films


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