J. F. Scott

Multiferroic and magnetoelectric materials

Phase transitions in BaMnF₄

BaMnF4 is a pyroelectric ferromagnet which displays a number of unusual physical characteristics, some of which are unique. It has the only known continuous antiferroelectric ph...

Ferroelectrically induced ferromagnetism

A new effect is reported: weak ferromagnetism induced in a ferroelectric antiferromagnet (BaMnF4) by means of a linear magnetoelectric interaction. The direction and magnitude o...

Mechanisms of dielectric anomalies in BaMn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

The $b$-axis dielectric anomaly at the commensurate-incommensurate phase-transition temperature in BaMn${\mathrm{F}}_{4}$ has been calculated. Its shape and magnitude agree with...

Magnetoelectric phenomena in BaMn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and Ba<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>0.99</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>0.01</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Dielectric behavior near the N\'eel temperatures of BaMn${\mathrm{F}}_{4}$ and Ba${\mathrm{Mn}}_{0.99}$${\mathrm{Co}}_{0.01}$${\mathrm{F}}_{4}$ has been measured. In accord with...