Magnetic-field control of the electric polarization in BiMnO3

Abstract

We present the microscopic theory of improper multiferroicity in BiMnO3, which can be summarized as follows: (1) the ferroelectric polarization is driven by the hidden antiferromagnetic order in the otherwise centrosymmetric C2/c structure; (2) the relativistic spin-orbit interaction is responsible for the canted spin ferromagnetism. Our analysis is supported by numerical calculations of electronic polarization using Berry's phase formalism, which was applied to the low-energy model of BiMnO3 derived from the first-principles calculations. We explicitly show how the electric polarization can be controlled by the magnetic field and argue that BiMnO3 is a rare and potentially interesting material where ferroelectricity can indeed coexist and interplay with the ferromagnetism.

4 pages, 3 figures

References in corpus (6)

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• Combining DFT and Many-Body Methods to Understand Correlated Materials
• Long-Range Magnetic Interactions Induced by the Lattice Distortions and the Origin of the E-type Antiferromagnetic Phase in the Undoped Orthorhombic Manganites
• Orbital Ordering and Magnetic Interactions in BiMnO${}_3$
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• Self-consistent linear response for the spin-orbit interaction related properties
• Magnetic structure and ferroelectric activity in orthorhombic YMnO3: relative roles of magnetic symmetry breaking and atomic displacements
• Activating magnetoelectric optical properties by twisting antiferromagnetic bilayers