Growth and magnetic properties of epitaxial Fe4N films on insulators possessing lattice spacing close to Si(001) plane

Keita Ito, Soma Higashikozono, Fumiya Takata, Toshiki Gushi, Kaoru Toko, Takashi Suemasu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We grew ferromagnetic Fe4N films by molecular beam epitaxy on MgO(001), MgAl2O4(MAO)(001), SrTiO3(STO)(001), and CaF2(001) substrates, possessing the lattice spacing close to Si(001) plane. Highly oriented epitaxial growth was confirmed for the Fe4N films on the MgO, MAO, and STO by reflection high-energy electron diffraction and x-ray diffractions. The degree of orientation of the Fe4N film on the STO was the best among these samples. This was attributed to the smallest lattice mismatch of −2.8% between Fe4N(001) and STO(001). On the other hand, crystallinity of the Fe4N film on the CaF2(001) substrate was poor due to a very large lattice mismatch of −30% between Fe4N(001) and CaF2(001) arising from the unexpected epitaxial relationship as Fe4N(001)[100] || CaF2(001)[100]. The saturation magnetization of the Fe4N films was approximately 1200 emu/cm3 at room temperature for all the samples, and the magnetization easy axis was in-plane Fe4N[100]. We consider that STO is the suitable buffer layer for the growth of Fe4N on Si(001), hence to realize the Si-based spintronics devices using highly spin-polarized Fe4N.

Original languageEnglish
Pages (from-to)66-70
Number of pages5
JournalJournal of Crystal Growth
Volume455
DOIs
Publication statusPublished - 2016 Dec 1

Keywords

  • A3. MBE
  • B1. CaF
  • B1. FeN
  • B1. MgAlO
  • B1. MgO
  • B1. SrTiO

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Growth and magnetic properties of epitaxial Fe<sub>4</sub>N films on insulators possessing lattice spacing close to Si(001) plane'. Together they form a unique fingerprint.

  • Cite this