Multimetal-Substituted Epsilon-Iron Oxide -Ga0.31Ti0.05Co0.05Fe1.59O3 for Next-Generation Magnetic Recording Tape in the Big-Data Era

From the viewpoints of large capacity, long-term guarantee, and low cost, interest in magnetic recording tapes has undergone a revival as an archive storage media for big data. Herein, we prepared a new series of metal-substituted -Fe2O3, -GaIII0.31TiIV0.05CoII0.05FeIII1.59O3, nanoparticles with an average size of 18nm. Ga, Ti, and Co cations tune the magnetic properties of -Fe2O3 to the specifications demanded for a magnetic recording tape. The coercive field was tuned to 2.7kOe by introduction of single-ion anisotropy on CoII (S=3/2) along the c-axis. The saturation magnetization was increased by 44% with GaIII (S=0) and TiIV (S=0) substitution through the enhancement of positive sublattice magnetizations. The magnetic tape media was fabricated using an actual production line and showed a very sharp signal response and a remarkably high signal-to-noise ratio compared to the currently used magnetic tape.