Coercivity and nanostructure in magnetic spinel Mg(Mn, Fe) 2O4

C. L. Zhang, S. Yeo, Y. Horibe, Y. J. Choi, S. Guha, M. Croft, S. W. Cheong, S. Mori

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

When Fe ions in the ferrimagnetic cubic MgFe2O4 are replaced by Jahn-Teller (JT)-active Mn ions, the structure evolves with two-step processes. For example, the quenched cubic MgMn1.5Fe 0.5O4 becomes tetragonal and JT distorted with slow cooling. However, with further slow cooling, the clustering tendency of JT-distorted Mn ions induces the formation of a checkerboard nano-self-assembly consisting of Mn-rich (tetragonal, paramagnetic) and -poor (cubic, ferrimagnetic) rods. This morphological evolution accompanies a drastic modification of ferrimagnetic properties, e.g., the magnetic coercivity changes by ∼25. The nanocheckerboard assembly with ferrimagnetic nanorods with large shape anisotropy can be a platform for ultra high-density memory devices.

Original languageEnglish
Article number133123
JournalApplied Physics Letters
Volume90
Issue number13
DOIs
Publication statusPublished - 2007

Bibliographical note

Funding Information:
Work at Rutgers was supported by the NSF DMR-0405682.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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