Giant Improper Ferroelectricity in the Ferroaxial Magnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CaMn</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:math>

D. Johnson, Roger; C. Chapon, L.; D. Khalyavin, D.; Manuel, Pascal; G. Radaelli, P.; Martin, C.

doi:10.1103/physrevlett.108.067201

Public

Giant Improper Ferroelectricity in the Ferroaxial MagnetCaMn7O12

Published in Physical Review Letters • Feb 6, 2012

Authors:

Roger D. Johnson

L. C. Chapon

D. D. Khalyavin

Abstract

In rhombohedral ${\mathrm{CaMn}}_{7}{\mathrm{O}}_{12}$, an improper ferroelectric polarization of magnitude $2870\text{ }\text{ }\ensuremath{\mu}\mathrm{C}\text{ }{\mathrm{m}}^{\ensuremath{-}2}$ is induced by an incommensurate helical magnetic structure that evolves below ${T}_{\mathrm{N}1}=90\text{...

Subject

Ferroelectricity

Polarization (electrochemistry)

Physics

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