Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/27787
Title: Magnetic domain study of micron-and nano-sized permalloy structures induced by a local current
Authors: SOH YEE SIANG
Keywords: Magnetic Force Microscopy, Permalloy, Domain Structures and Micro-
Issue Date: 30-May-2006
Source: SOH YEE SIANG (2006-05-30). Magnetic domain study of micron-and nano-sized permalloy structures induced by a local current. ScholarBank@NUS Repository.
Abstract: In spin-tronic devices such as magnetic random access memory (MRAM), patterned magnetic elements are widely used as unit cells of bit storage. To manipulate data bits, perpendicular electric currents are passed above and below each unit cell to generate the required magnetic field for magnetization reversal. In our work, we study the domain evolution of 40-nm-thick permalloy rods with lengths between 12 I?m and 200 nm with a length:width aspect ratio of 4:1 using a magnetic force microscope (MFM). A simplified MRAM structure which consists of arrays of magnetic elements patterned on top of Au conductors allows us to pass currents and generate localized magnetic fields. The domain changes are compared with results from micro-magnetic simulations (OOMMF) and vibrating sample magnetometer (VSM) measurements. Depending on the applied field angle, domain structures such as quasi-single domain structure, 3-diamond, 2-diamond and 1-diamond structures are observed.
URI: http://scholarbank.nus.edu.sg/handle/10635/27787
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
MEng Thesis - All.pdf12.27 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

253
checked on Dec 11, 2017

Download(s)

564
checked on Dec 11, 2017

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.