Ferromagnetism induced by lattice volume expansion and amorphization in EuTiO3 thin films

Katsuhisa Tanaka, Koji Fujita, Yuya Maruyama, Yoshiro Kususe, Hideo Murakami, Hirofumi Akamatsu, Yanhua Zong, Shunsuke Murai

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Lattice volume expansion or amorphization renders EuTiO3 ferromagnetic, although the stable phase of crystalline EuTiO3 is an antiferromagnet. The lattice volume expansion is induced into the crystalline EuTiO3 thin film by utilizing the lattice mismatch between the thin film and a substrate. The magnetization at low temperatures monotonically increases with an increase in lattice volume for the crystalline EuTiO 3 thin film, coincident with the results of calculations based on the hybrid Hartree-Fock density functional approach. The ferromagnetic interaction between Eu2+ ions is enhanced by the amorphization as well; the amorphous EuTiO3 thin film becomes a ferromagnet, and the Curie temperature is higher for amorphous Eu2TiO4 than for its crystalline counterpart. The phenomenon, that is, the volume expansion- and amophization-induced ferromagnetism, is explained in terms of the competition between ferromagnetic and antiferromagnetic interactions among Eu2+ ions.

Original languageEnglish
Pages (from-to)1031-1041
Number of pages11
JournalJournal of Materials Research
Volume28
Issue number8
DOIs
Publication statusPublished - Apr 28 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Ferromagnetism induced by lattice volume expansion and amorphization in EuTiO<sub>3</sub> thin films'. Together they form a unique fingerprint.

  • Cite this

    Tanaka, K., Fujita, K., Maruyama, Y., Kususe, Y., Murakami, H., Akamatsu, H., Zong, Y., & Murai, S. (2013). Ferromagnetism induced by lattice volume expansion and amorphization in EuTiO3 thin films. Journal of Materials Research, 28(8), 1031-1041. https://doi.org/10.1557/jmr.2013.60