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Control of Chiral Magnetism Through Electric Fields in Multiferroic Compounds above the Long-Range Multiferroic
J Stein1, M Baum1, S Holbein1,2
1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany.
Physical Review Letters
|December 9, 2017
Summary
Type-II multiferroics enable electric field control of spin chirality, even without long-range magnetic order. This chiral magnetism, linked to electromagnions, is observable above the transition temperature in TbMnO3 and MnWO4.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Type-II multiferroics exhibit a coupling between magnetic and electric properties.
- Controlling spin chirality is crucial for advanced electronic devices.
- Long-range multiferroic order is typically required for such control.
Purpose of the Study:
- To investigate the electric field control of spin chirality in type-II multiferroics.
- To determine if spin chirality can be controlled independently of long-range multiferroic order.
- To explore the temperature dependence of chiral magnetism in TbMnO3 and MnWO4.
Main Methods:
- Polarized neutron scattering experiments were employed.
- The study focused on two prototype compounds: Terbium Manganite (TbMnO3) and Manganese Tungstate (MnWO4).
- Measurements were conducted above the multiferroic transition temperature (TMF).
Main Results:
- Spin chirality control via electric fields was demonstrated, even without long-range multiferroic order.
- Chiral magnetism, associated with soft overdamped electromagnions, was observed above TMF in both compounds.
- TbMnO3 showed chiral magnetism over a wider temperature range compared to MnWO4.
Conclusions:
- External electric fields can control spin chirality in type-II multiferroics, offering new avenues for device applications.
- The findings challenge the necessity of long-range multiferroic order for electric field control of magnetism.
- TbMnO3 serves as a promising material for studying and utilizing electric-field-controlled chiral magnetism.
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