Electromagnetic field in light band produced heat on TuMR read sensor

Abstract

The lights of fluorescent used in hard disk assembly (HDA) process is the one form of the electromagnetic field that can generate heat and lead to read sensor degradation due to the field induced. In this work, the characteristic of heat occurred on TuMR read sensor is observed by using electromagnetic simulation software. We have found that the highest temperature occurs at the nearest side of TuMR sensor, which directly contacts with the front of incident wave that is anti-ferromagnetic layer with 164.0654 ?C at 750 THz. Moreover, when the middle of each layer in the TuMR is observed, the spacer layer has the highest temperature of 43.9427 ?C at 750 THz. However, when both of blocking and melting temperatures of read sensor material are determined, the temperature level occurred in TuMR read sensor is lower than both of them. Therefore, the heat induced from the electromagnetic field in light band that E-file is 10 V/m has no effect on the magnetic properties of TuMR read sensor and HDA process.