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Driving Spin Excitations by Hydrostatic Pressure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>BiFeO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Optical spectroscopy has been combined with computational and theoretical techniques to show how the spin dynamics in the model multiferroic ${\mathrm{BiFeO}}_{3}$ responds to the application of hydrostatic pressure and its corresponding series of structural phase transitions from $R3c$ to the $Pnma$ phases. As pressure increases, multiple spin excitations associated with …