Particle Orientation Effects of Barium Ferrite Particulate Media

Modeling of the write and read back performances of hexagonal Ba-ferrite particulate media for high density tape recording

“…In most cases the #P media show the best SNR performance and the #R media show the worst. The results are in good agreement with the experimental studies [7].…”

“…1a). The particles started to grow from the randomly distributed seed points until the spatial packing density reaches about 40%, which reproduces the experimental results [7]. The microstructural models of the particulate media models are shown in Fig.…”

“…1c and d. According to the hysteresis loops, the chosen Dy and Df values lead to squarenesses and coercivities which are close to experimental data as shown in Table 1 [7,12,13].…”

“…The 6.7 Gbit/in 2 writing and read-back processes were performed using randomly oriented h-BaFe media. However, as h-BaFe particles have been originally suggested for perpendicular media, recent results reveal a higher signal-to-noise ratio (SNR) when the media particles are aligned to a certain direction [7,8].…”

Development of advanced barium ferrite tape media

“…As described in [19], the thermal stability factor, K u V/k B T, should be at least 60, where K u is the anisotropy energy density, V the particle volume, k B the Boltzmann constant, and T the absolute temperature. The K u V/k B T value, which was estimated by the method described in [20], is also presented in Table 1 as the ensemble median. Particle A had a K u V/k B T value of 63; therefore, thermal stability was ensured for such fine magnetic particles.…”