Interfacial ferromagnetism and atomic structures in high-temperature grown Fe3O4/Pt/Fe3O4 epitaxial trilayers

T. Kikkawa, M. Suzuki, R. Ramos, M. H. Aguirre, J. Okabayashi, K. Uchida, I. Lucas, A. Anadón, D. Kikuchi, P. A. Algarabel, L. Morellón, M. R. Ibarra, E. Saitoh

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2 Citations (Scopus)

Abstract

Induced Pt ferromagnetism in Fe 3 O 4 / Pt / Fe 3 O 4 epitaxial trilayer films has been investigated by means of X-ray magnetic circular dichroism (XMCD) at the Pt L 3, 2-edges at various temperatures from 300 K to 12 K, including the metal-insulator transition temperature of Fe 3 O 4 (T V ∼ 114 K). At all the temperatures, we observed clear XMCD signals due to Pt ferromagnetism, the amplitude of which was determined to be 0.39 μ B at 300 K and 0.52 μ B at 12 K for the sample with the Pt thickness of ∼ 2 nm. Interestingly, these values are comparable to or even greater than those in Pt/3 d-ferromagnetic-metal (Fe, Ni, Co, and Ni 81 Fe 19) junction systems. The results can be interpreted in terms of a possible Fe interdiffusion into the Pt layer and also possible Fe-Pt alloying due to its high-temperature deposition.

Original languageEnglish
Article number143903
JournalJournal of Applied Physics
Volume126
Issue number14
DOIs
Publication statusPublished - 2019 Oct 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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