Data storage is a critical enabler to all aspects of modern life. It was estimated that in 2023 digital data storage stood at 64 zettabytes, roughly doubling every two years. Contemporary computer storage technologies use either electric or magnetic polarization to store single bits of information; a power-hungry technology that will soon struggle to keep-up with the ever-increasing demands. Masanet et al. pointed-out that in 2018, data centers used 205 TWh of electricity, ca 1% of global consumption. Interestingly, due to major increases in energy efficiency this was only a 6% increase on the 2010 figure, despite a 550% increase in digital data storage over the same period. This emphasizes the importance for the sector of maintaining the energy-efficiency trajectory. Technologies that simultaneously combine ferroelectric and ferromagnetic/ferrimagnetic properties can use energy-efficient electric fields for the reading and writing of data and in-principle could allow an eight-times increase in data storage capacity per threshold 17 is a well-known strategy for enhancing long-range magnetic ordering and magnetization (Supplementary Section SI1). Additionally, computational studies on the Aurivillius phases by Birenbaum et al. have demonstrated that increasing the concentration of magnetic ions raises the ferrimagnetic Curie temperature. Thus, increasing the magnetic ion concentration at the B-site of the B6TFMO structure beyond the current level of ca. 40% is a critical factor in further improving its magnetic properties.