Multimetalâ Substituted Epsilonâ Iron Oxide ϵâ Ga0.31Ti0.05Co0.05Fe1.59O3 for Nextâ Generation Magnetic Recording Tape in the Bigâ Data Era

Abstract

From the viewpoints of large capacity, longâ 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 metalâ substituted ϵâ Fe2O3, ϵâ GaIII0.31TiIV0.05CoII0.05FeIII1.59O3, nanoparticles with an average size of 18â nm. Ga, Ti, and Co cations tune the magnetic properties of ϵâ Fe2O3 to the specifications demanded for a magnetic recording tape. The coercive field was tuned to 2.7â kOe by introduction of singleâ ion anisotropy on CoII (S=3/2) along the câ axis. The saturation magnetization was increased by 44â % 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 signalâ toâ noise ratio compared to the currently used magnetic tape.For the record: A new series of metalâ substituted ϵâ Fe2O3 nanoparticles, ϵâ GaIII0.31TiIV0.05CoII0.05FeIII1.59O3, with an average size of 18â nm was prepared. The Ga, Ti, and Co cations tune the magnetic properties of ϵâ Fe2O3 to the specifications demanded for a magnetic recording tape. The fabricated magnetic tape showed a remarkably high signalâ toâ noise ratio. This series of materials should be applicable for data storage in the bigâ data era.