| Author | Phakchira Ekbanphot |
| Note | A thesis submitted in partial fulfillment of the requirements for the
Degree of Master of Science in Mechatronics, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Areal Density (AD) trend in HDD has been rapidly growing. There are a lot of researches and techniques to achieve the AD targeting, and the favorite technique is reducing the magnetic physical dimension.
In the read sensor when scaling down the dimensions, it will affect the thermal magnetic noise stability. This also reduces the signal-to-noise ratio (SNR). The majority of thermal noise stability increase is caused by weakened Anti-ferromagnetic (AFM) layer pinning field and weakened coupling field between pinned layer (PL) and reference layer (RL). To enhance the pinning field strength, we propose to extend the pinning layer longer than the free layer (FL). This is to provide extra magnetic grain volume in PL and AFM layer.
This thesis proposes to study the read sensor characteristics and blocking temperature (Tb) effects when the PL is extended longer than the FL. Additionally, the thesis will provide the magnetic read back performance and magnetic sensor noise stability relative to SH changing. This thesis compares the read sensor performance between conventional PL design and extended PL design. The analysis result and discussion have been provided. |
| Year | 2015 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Huynh Trung Luong; |
| Examination Committee(s) | Mongkol Ekpanyapong ;Pramern Suwannasing; |
| Scholarship Donor(s) | Western Digital ;NECTEC, Thailand ;AIT Fellowship; |