Acoustically Assisted Magnetic Recording: A New Paradigm in Magnetic Data Storage

Author

Weiyang Li ; Buford, Benjamin ; Jander, Albrecht ; Dhagat, Pallavi

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR, USA

Volume

50

Issue

3

fYear

2014

fDate

Mar-14

Firstpage

37

Lastpage

40

Abstract

A new paradigm in energy-assisted magnetic recording, acoustically assisted magnetic recording (AAMR), is investigated. In this approach, a surface acoustic wave (SAW) is applied to a magnetostrictive recording medium to temporarily lower its coercivity below the write field. Akin to other energy-assisted recording technologies, AAMR provides a strategy to enable writing on high-coercivity media required for thermal stability in high-density disk drives. Using a contact recording tester, it is demonstrated that the write current needed to record data on a galfenol film is reduced in the presence of SAWs. Further, it is shown that standing and focused acoustic waves can, respectively, be used to lower the coercivity in selected regions on the medium.

Keywords

coercive force; data recording; disc drives; magnetic film stores; magnetic recording; magnetostrictive devices; surface acoustic wave devices; thermal stability; AAMR; SAW; acoustically assisted magnetic recording; contact recording tester; data recording; energy-assisted magnetic recording; galfenol film; high-coercivity media; high-density disk drive; magnetic data storage; magnetostrictive recording medium; surface acoustic wave; thermal stability; Coercive force; Magnetic recording; Magnetoacoustic effects; Magnetostriction; Surface acoustic waves; Magnetic recording; surface acoustic wave;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2285018

Filename

6774941