The enhancement of magnetic damping in Fe4N films with increasing thickness

Shinji Isogami, Masakiyo Tsunoda, Mikihiko Oogane, Akimasa Sakuma, Migaku Takahashi

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4 Citations (Scopus)

Abstract

The film thickness dependence of the magnetic damping coefficient (α) was investigated by measuring the ferromagnetic resonance (FMR) of Fe 4N/NM (NM: Pt and Cu) bilayer films at room temperature. We observed that α in Fe4N/Pt films increased with increasing Fe 4N film thickness. Moreover, the enhancement of α, which is represented by the difference in the α values of Fe4N/Pt and Fe4N/Cu films, also increased as the Fe4N film thickness increased. The behavior observed in the Fe4N system was the opposite of that observed for the conventional Ni-Fe system. We speculated two mechanisms occurring in Fe4N/Pt films, which are less magnetic and/or nonmagnetic impurities in the Fe4N films and enhancement of the coercive force (Hc) with increasing Fe4N film thickness.

Original languageEnglish
Article number073001
JournalJapanese journal of applied physics
Volume52
Issue number7 PART 1
DOIs
Publication statusPublished - 2013 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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