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Uniaxial-stress control of spin-driven ferroelectricity in multiferroic Ba(2)CoGe(2)O(7)
Taro Nakajima1, Yusuke Tokunaga1, Vilmos Kocsis2
1RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
Physical Review Letters
|February 28, 2015
Summary
Applying compressive stress to the multiferroic material Ba(2)CoGe(2)O(7) induces spin-driven ferroelectricity. This stress rotates magnetic order, enabling electric polarization along the c axis.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Multiferroic materials exhibit coupled magnetic and electric properties.
- Spin-driven ferroelectricity arises from magnetic ordering.
- Controlling multiferroic behavior is key for advanced electronic applications.
Purpose of the Study:
- To investigate the effect of uniaxial stress on spin-driven ferroelectricity in Ba(2)CoGe(2)O(7).
- To explore the relationship between magnetic sublattice rotation and electric polarization.
- To demonstrate stress-induced control over multiferroic phenomena.
Main Methods:
- Experimental application of uniaxial compressive stress along the [110] direction.
- Analysis of magnetic sublattice magnetization and its rotation.
- Observation of spontaneous electric polarization along the c axis.
Main Results:
- Compressive stress along [110] induces a 45° or 135° rotation of the antiferromagnetic sublattice magnetization.
- This magnetic rotation enables the emergence of spontaneous electric polarization along the c axis.
- Demonstrated stress-controlled spin-driven ferroelectricity in Ba(2)CoGe(2)O(7).
Conclusions:
- Uniaxial stress is an effective method to control spin-driven ferroelectricity in multiferroics.
- Anisotropic stress can induce diverse cross-correlated phenomena in magnetic materials.
- This provides a pathway for designing novel multiferroic devices.
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