Finite size effects with variable range exchange coupling in thin-film Pd/Fe/Pd trilayers

R. K. Das, R. Misra, S. Tongay, R. Rairigh, A. F. Hebard

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The magnetic properties of thin-film Pd/Fe/Pd trilayers in which an embedded ∼ 1.5 over(Å,)- thick ultrathin layer of Fe induces ferromagnetism in the surrounding Pd have been investigated. The thickness of the ferromagnetic trilayer is controlled by varying the thickness of the top Pd layer over a range from 8 to 56 over(Å,). As the thickness of the top Pd layer decreases, or equivalently as the embedded Fe layer moves closer to the top surface, the saturated magnetization normalized to area and the Curie temperature decreases, whereas the coercivity increases. These thickness-dependent observations for proximity-polarized thin-film Pd are qualitatively consistent with finite size effects that are well known for regular thin-film ferromagnets. The critical exponent β of the order parameter (magnetization) is found to approach the mean field value of 0.5 as the thickness of the top Pd layer increases. The functional forms for the thickness dependences, which are strongly modified by the nonuniform exchange interaction in the polarized Pd, provide important new insights to understand nanomagnetism in two-dimensions.

Original languageEnglish (US)
Pages (from-to)2618-2621
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number17
DOIs
StatePublished - Sep 2010
Externally publishedYes

Keywords

  • Ferromagnetic palladium
  • Thickness dependent Curie temperature
  • Thickness dependent coercivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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