Structural properties of alternate monatomic layered [Fe/Co]n epitaxial films on MgO substrate

In Chang Chu, Yoshinobu Saki, Shohei Kawasaki, Masaaki Doi, Masashi Sahashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Body-centered-cubic (bcc) Fe50Co50 material is reported to show a high bulk spin scattering coefficient on current perpendicular to plane-giant magneto-resistance (CPP-GMR) system. But the origin of that phenomenon does not make sure yet. We prepared artificially alternate monatomic layered (AML) [Fe/Co] 41 MLs epitaxial films (Ts: 75, 250 °C) by monatomic deposition method and investigated the topology of AML [Fe/Co]n epitaxial films on MgO substrate with different orientation (001), (011) by the scanning tunnel microscopy (STM) and reflection high energy electron diffraction (RHEED), which we could confirm Frank-van der Merwe (FM) growth mode for AML [Fe/Co]n on MgO(001) and Volmer-Weber (VW) growth mode for that on Mg(011). The roughness of surface, Ra (0.20 nm) of AML [Fe/Co] 41 MLs epitaxial film grown at 75 °C on MgO(001) is smaller than that (0.46 nm) of AML [Fe/Co] grown at 250 °C on MgO(001), which has the large terraces of over 50 nm (Ra: 0.17nm), even though there are some valleys between large terraces. Moreover we confirmed the structural properties of trilayered epitaxial films with AML [Fe/Co]n (Ra: 0.18 nm) and Fe50Co50 alloy epitaxial film on Au electrode by RHEED before confirming the characteristics of CPP-GMR devices.

Original languageEnglish
Pages (from-to)4511-4514
Number of pages4
JournalJapanese journal of applied physics
Volume47
Issue number6 PART 1
DOIs
Publication statusPublished - 2008 Jun 13

Keywords

  • Alternate monatomic deposition
  • CPP-GMR
  • Epitaxial film
  • FeCo B2 structure
  • Film growth mode

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Structural properties of alternate monatomic layered [Fe/Co]<sub>n</sub> epitaxial films on MgO substrate'. Together they form a unique fingerprint.

Cite this