We fabricated polymer blends of recycled-PC (PC) and recycled-PET (PET) using high-shear processing technology. We also assessed its structure, morphology, and physical properties. Results of DSC measurements show that Tg of PC and Tc of PET shifted to higher temperatures by kneading under high-shear conditions. Results show further that the Tm of PET shifted to a lower temperature. Moreover, compatibilization progressed. TEM observations show that the PET domain was not confirmed completely under the kneading condition of 1 000 min−1/10 s or more. Compatibilization progressed. Tensile test results show that the PET ratio of 30 wt% (1 000 min−1/10 s) has higher breaking strain than neat PC does. Chemical resistance test results obtained by good solvent of PC demonstrated that blending of PET makes PC elution difficult.

Magnetic fluctuation noise due to a pinned layer (Nmag-pin) was measured to improve head-amp SNR by using fabricated heads, and the results were confirmed through micro-magnetic simulations. An experiment revealed that the Nmag-pin decreased as exchange coupling Jk and/or sensor aspect ratio (SH/Twr) increased. These results were consistent with the simulated ones. Reduced Nmag-pin was expected by both increasing Jk and larger SH/Twr. The simulations indicated that the head with Jk ~ 1.3 erg/cm 2 suppressed most Nmag-pin, and demonstrated improved head-amp SNR around 1 dB.