Multiferroicity in the square-lattice antiferromagnet of Ba 2CoGe2O7

H. T. Yi, Young Jai Choi, S. Lee, S. W. Cheong

Research output: Contribution to journalArticle

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Abstract

We have discovered the appearance of ferroelectricity below the Neel temperature of 6.7 K in the antiferromagnetic Ba2CoGe 2O7 with square magnetic lattice. The ferroelectric polarization is rather small in magnitude and aligned along the c axis, but its magnitude increases remarkably and its direction rotates away smoothly from the c axis when magnetic fields are applied along the c axis. The electric polarization's behavior of smooth rotation, rather than a sudden flip, is unique. It also accompanies a linear increase in magnetization and a smooth change of dielectric constant with little hysteresis, which may be important for certain technological applications.

Original languageEnglish
Article number212904
JournalApplied Physics Letters
Volume92
Issue number21
DOIs
Publication statusPublished - 2008 Jun 6

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ferroelectricity
polarization
neel temperature
hysteresis
permittivity
magnetization
magnetic fields

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Multiferroicity in the square-lattice antiferromagnet of Ba 2CoGe2O7. / Yi, H. T.; Choi, Young Jai; Lee, S.; Cheong, S. W.

In: Applied Physics Letters, Vol. 92, No. 21, 212904, 06.06.2008.

Research output: Contribution to journalArticle

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AB - We have discovered the appearance of ferroelectricity below the Neel temperature of 6.7 K in the antiferromagnetic Ba2CoGe 2O7 with square magnetic lattice. The ferroelectric polarization is rather small in magnitude and aligned along the c axis, but its magnitude increases remarkably and its direction rotates away smoothly from the c axis when magnetic fields are applied along the c axis. The electric polarization's behavior of smooth rotation, rather than a sudden flip, is unique. It also accompanies a linear increase in magnetization and a smooth change of dielectric constant with little hysteresis, which may be important for certain technological applications.

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