12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Investigation of artificial domains realized by...
View graph of relations

« Back

Investigation of artificial domains realized by local gallium focused ion-beam modification of Pt/Co/Pt trilayer structures

Research output: Contribution to journalJournal article

Published

  • A Aziz
  • SJ Bending
  • H Roberts
  • S Crampin
  • PJ Heard
  • CH Marrows
???articleNumber???08C504
Journal publication date15/04/2006
JournalJournal of Applied Physics
Journal number8
Volume99
Number of pages3
Original languageEnglish

Abstract

We present the results of experimental investigations of magnetic switching and magnetotransport in a generation of magnetic devices containing artificially patterned domains. Our devices are realized by locally reducing the coercive field of a perpendicularly magnetized Pt(3.5 nm)/Co(0.5 nm)/Pt(1.6 nm) trilayer structure using a gallium focused ion beam. Artificial domain walls are created at the interfaces between dosed and undosed regions when an external magnetic field switches the former but not the latter. We have exploited this property to create stripelike domains with widths down to submicron length scales, separated by undosed regions. Using the extraordinary Hall effect to monitor the local magnetization we have investigated the reversal dynamics of these artificial domains by measuring major and minor hysteresis loops. The coercive field of regions irradiated with identical doses systematically increases as their size decreases. In the lower branch of minor loops, reversal is seen to occur via a few large Barkhausen events. Preliminary measurements of transport across domain walls reveal a positive domain-wall resistance, that does not change sign from 4.2 to 300 K. (C) 2006 American Institute of Physics.