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Phys. Rev. Lett. 101, 137203 (2008) [4 pages]

Formation of Pancakelike Ising Domains and Giant Magnetic Coercivity in Ferrimagnetic LuFe2O4

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Weida Wu1,*, V. Kiryukhin1, H.-J. Noh2,†, K.-T. Ko2, J.-H. Park2, W. Ratcliff, II3, P. A. Sharma4,‡, N. Harrison4, Y. J. Choi1, Y. Horibe1, S. Lee1, S. Park1, H. T. Yi1, C. L. Zhang1, and S.-W. Cheong1
1Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
2Department of Physics and Electron Spin Science Center, Pohang University of Science and Technology, Pohang, 790-784, Korea
3NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899, USA
4NHMFL-LANL, Los Alamos, New Mexico 87544, USA

Received 23 June 2008; published 24 September 2008

We have studied quasi-two-dimensional multiferroic LuFe2O4 with strong charge-spin-lattice coupling, in which low-temperature coercivity approaches an extraordinary value of 9 T in single crystals. The enhancement of the coercivity is connected to the collective freezing of nanoscale pancakelike ferrimagnetic domains with large uniaxial magnetic anisotropy (“Ising pancakes”). Our results suggest that collective freezing in low-dimensional magnets with large uniaxial anisotropy provides an effective mechanism to achieve enhanced coercivity. This observation may help identify novel approaches for synthesis of magnets with enhanced properties.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.137203
DOI:
10.1103/PhysRevLett.101.137203
PACS:
75.50.Vv, 75.25.+z, 77.84.−s

*wdwu@physics.rutgers.edu

†Also at: Department of Physics, Chonnam National University, Gwangju 500-757, Korea

‡Current address: Materials Physics Department, Sandia National Laboratories, Livermore, CA 94551

 
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