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The discovery of stable room temperature ferroelectricity in Croconic Acid,an organic ferroelectric material, with polarization values on par with thosefound in inorganic ferroelectric materials and highest among organicferroelectric materials, has opened up possibilities to realize myriads ofnano-electronic and spintronic devices based on organic ferroelectrics. Suchpossibilities require an adequate understanding of the ferroelectric propertiesof Croconic Acid grown on surfaces that are commonly employed in devicefabrication. While several macroscopic studies on relatively larger crystals ofCroconic Acid have been performed, studies on thin films are only in theirearly stages. We have grown thin films of Croconic Acid on gold and cobaltsurfaces, which are commonly used in spintronic devices as metallic electrodes,and studied the ferroelectric response of the films using ex-situ PiezoresponseForce Microscopy at room temperature. We show that the polarization reversal inCroconic Acid domains is sensitive to the substrate surface. Using the sameexperimental protocol, we observe the robust polarization reversal of a single,mostly in-plane electrical domain for a cobalt substrate, whereas polarizationreversal is hardly observed for a gold substrate. We attribute this differenceto the influence of substrates on the Croconic Acid molecular networks. Ourstudy suggests that to realize devices one has to take care about the substrateon which Croconic Acid will be deposited. The fact that polarization switchingis robust on cobalt surface can be used to fabricate multifunctional devicesthat utilize the cobalt-Croconic Acid interface.

Robust ferroelectric properties of organic Croconic Acid films grown on spintronically relevant substrates