A characterization on full-width profile response of a tunneling magnetoresistive reader in conventional perpendicular recording for two-dimensional magnetic recording technology | |
| Author | Agonon, Mark Valen Leal |
| Subject(s) | Tunneling Magnetic recorders and recording |
| Note | The Degree of Master of Science in Microelectronics and Embedded Systems, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Digital storage continues to grow at 40% compounded annual growth rate (CAGR) driving the need to increase areal density of Hard Disk Drive (HDD). A study thirteen years ago, predicts conventional recording to reach its limit around 1Tb/in2 dictated by the superparamagnetic effect (thermal stability) of the recording medium as the magnetic grains reduce in size. Two-Dimensional Magnetic Recording (TDMR) receives considerable interest in research as one of the few novel technologies than can overcome this limitation due to its remarkable potential to stimulate an era of multiple Tb/in2 in magnetic recording technology. Although TDMR can reach 10Tb/in2 areal density and beyond, its implementation requires a sophisticated fabrication of read-back transducer with an array of multiple sensors and a new signal processing architecture. In this study, the fundamental capability of a conventional reader to read magnetic response across its full surface-width during read-back and distinguish the different signals from overlapping patterns in conventional perpendicular recording is demonstrated. A conventional reader positioned across multiple tracks written in shingled for a single pass read back is studied. Three different frequencies are used to write three data tracks in shingled using spinstand. With conventional magnetic reader, the written tracks are read at seven positions and the magnetic profiles are analyzed. The read-back signals from track center of the middle track is characterized for the presence of the three different write frequencies and its classification individually. Similar method without the middle track is done to replicate the trend and confirm the signals obtained. Physical MWW is measured to validate the findings in spinstand. This method benefits a straightforward read-back scheme for TDMR using the current reader technology. No extensive magnetic head design and manufacturing technology to support TDMR are necessary. |
| Year | 2013 |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Bargmann, Brent; |
| Examination Committee(s) | Bohez, Erik L. J.;Padmanony, Rameshmanirangan; |