By Topic

Study of One-Side-Flat Edge on Vortex in Submicro-Scaled Permalloy Disks

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
Chao-Hsien Huang$^{1}$Department of Physics,, National Changhua University of Education,, Changhua , Taiwan ; Cheng-Ta Yang ; Kuo-Ming Wu ; Tian-Chiuan Wu
more authors

By introducing a one-side-flat edge to a submicroscaled Permalloy disk, the isotropy of the disk is broken to achieve the control on vortex nucleation and annihilation. Series one-side-flat magnetic disk arrays with different cutting percentages of disk are fabricated to observe the influence from asymmetry on the vortex configuration in submicroscaled magnetic disks. In the excised angles were varied from 15° to 90° in 500-nm-diameter and 40-nm-thick NiFe disk arrays, it is observed the dependences of vortex nucleation and annihilation fields on the asymmetry. Linear relations of vortex nucleation and annihilation fields to aspect ratio were found that would be useful for controlling nucleation and annihilation fields on purpose. Micromagnetism simulations for Permalloy disk array with a diameter of 500 nm and different excise dangles were executed to compare with experimental data. The relations of vortex existence field to the aspect ratio were found that could be taken into account for designing single vortex element applications. In addition to magnetic field parallel to excised flat edge, the constant perpendicular field (Hy) applied to sample could change vortex nucleation and annihilation field of Py disk array. Finally, It was found that a higher asymmetry effect could depress the unpleasantly interactions and lead to a narrow range of switching field distribution, which was an important index for designing high-density magnetic devices.

Published in:

IEEE Transactions on Magnetics  (Volume:46 ,  Issue: 6 )