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

doi:10.1063/1.2717568

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

Department of Physics

Research output: Contribution to journal › Article › peer-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 MgMn_1.5Fe _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 language	English
Article number	133123
Journal	Applied Physics Letters
Volume	90
Issue number	13
DOIs	https://doi.org/10.1063/1.2717568
Publication status	Published - 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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title = "Coercivity and nanostructure in magnetic spinel Mg(Mn, Fe) 2O4",

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.",

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AU - Zhang, C. L.

AU - Yeo, S.

AU - Horibe, Y.

AU - Choi, Y. J.

AU - Guha, S.

AU - Croft, M.

AU - Cheong, S. W.

AU - Mori, S.

N1 - Funding Information: Work at Rutgers was supported by the NSF DMR-0405682.

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