Phys. Rev. B 79, 180401(R) (2009) [4 pages]

Pancakelike Ising domains and charge-ordered superlattice domains in LuFe₂O₄

Abstract

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S. Park, Y. Horibe, Y. J. Choi, C. L. Zhang^*, S.-W. Cheong, and Weida Wu^†
Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersey 08854, USA

Received 25 January 2009; revised 3 March 2009; published 1 May 2009

We report magnetic and superlattice imaging of ferrimagnetic bilayered LuFe₂O₄ with strong uniaxial magnetic anisotropy. Magnetization reversal is imaged in magnetic fields up to 8 T at several temperatures below T_N (∼230 K) and charge-ordered superlattice domains are imaged at 92 K. We observed random packing of irregular pancakelike magnetic domains (∼100 nm×30 nm) and charge-ordered superlattice domains with similar shape (∼30 nm×6 nm). The magnetic domain structure shows a strong memory effect in magnetization reversal. Our results are consistent with a spin-charge cross-coupling mechanism in LuFe₂O₄.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.79.180401

DOI:

10.1103/PhysRevB.79.180401

PACS:

75.60.−d, 77.80.Dj, 72.80.Ga

^*Present address: Department of Physics, University of Tennessee Knoxville, TN 37996, USA.

^†Corresponding author: wdwu@physics.rutgers.edu

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