Thermal Stability of Data Storage Tapes Prepared from Ultrafine Particles

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  • データストレージ用磁気テープの熱安定性(ヘッド・媒体および一般)

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Abstract

The reverse field dependence of the normalized magnetization decay and the effect of the ratio of the fluctuation field (H_f) to coercivity (H_c) on the temperature coefficient of coercivity {α(H_c)} were studied for advanced data storage tapes prepared from ultrafine acicular metal particulate (MP) composite and hexagonal platelet Ba-ferrite (BF) particles. The mean volume of particles (V_<phy>) for these tapes varied from approximately 2000-5000nm^3. The effects of the degree of particle orientation (OR) on the normalized magnetization decay and activation volume (V_<act>) were also studied for advanced MP tapes. The values of H_f were not constant, but were largely dependent on the reverse field for ultrafine MP and all of BF tapes. In comparison to MP and BF tapes with approximately same V_<phy>, the normalized magnetization decay and H_f of BF tapes were much larger than that of MP tapes. The smaller the V_<phy> was, the larger the normalized magnetization decay became. The value of α(H_c), which is important for the thermal stability of high-density recording media, increased as the ratio H_f/H_c increased for both tapes. In MP tape with a larger V_<phy> (5300nm^3), increasing the OR was found to decrease the normalized magnetization decay. However, OR values had little effect on the normalized magnetization decay of advanced MP tape with a smaller V_<phy> (1700nm^3) and it was difficult to decrease the irreversible susceptibility that is affected significantly the normalized magnetization decay. These may be attributed to the existence of a few particles approaching the theoretical superparamagnetic limit. The value of V_<act> in the low reverse field, which is a major factor affecting media noise, decreased as OR increased regardless of V_<phy>. To decrease the normalized magnetization decay, it is particularly important to originate in decreasing H_f and increase H_c that related to the anisotropy field and distribution for advanced MP and BF tapes with very small V_<phy>.

Journal

  • ITE Technical Report

    ITE Technical Report 33.28 (0), 19-24, 2009

    The Institute of Image Information and Television Engineers

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