Multimetal-Substituted Epsilon-Iron Oxide ϵ-Ga_0.31Ti_0.05Co_0.05Fe_1.59O₃ for Next-Generation Magnetic Recording Tape in the Big-Data Era

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• 作者：Prof. Shin-ichi Ohkoshi ; Dr. Asuka Namai ; Marie Yoshikiyo ; Dr. Kenta Imoto ; Kazunori Tamazaki ; Koji Matsuno ; Osamu Inoue ; Tsutomu Ide ; Kenji Masada ; Masahiro Goto ; Takashi Goto ; Takayuki Yoshida and Tatsuro Miyazaki
• 刊名：Angewandte Chemie
• 出版年：2016
• 出版时间：September 12, 2016
• 年：2016
• 卷：128
• 期：38
• 页码：11575-11578
• 全文大小：2491K
• ISSN：1521-3757

文摘

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 ϵ-Fe₂O₃, ϵ-Ga^III_0.31Ti^IV_0.05Co^II_0.05Fe^III_1.59O₃, nanoparticles with an average size of 18 nm. Ga, Ti, and Co cations tune the magnetic properties of ϵ-Fe₂O₃ to the specifications demanded for a magnetic recording tape. The coercive field was tuned to 2.7 kOe by introduction of single-ion anisotropy on Co^II (S=3/2) along the c-axis. The saturation magnetization was increased by 44 % with Ga^III (S=0) and Ti^IV (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.