Dependence of spatial coherence of coherent suppression of magnetization precession upon aspect ratio in Ni₈₁Fe₁₉ microdots

Barman, A., Kruglyak, V.V., Hicken, R.J., Scott, J. and Rahman, M. (2005) Dependence of spatial coherence of coherent suppression of magnetization precession upon aspect ratio in Ni₈₁Fe₁₉ microdots. Journal of Applied Physics, 97(10), 10A710. (doi: 10.1063/1.1850834)

Abstract

Coherent suppression of magnetization dynamics in circular microdots of Ni₈₁Fe₁₉ has been observed by time-resolved scanning Kerr effect microscopy. The applied pulsed field rose sharply, stimulating precession, and then exhibited an oscillatory behavior. For certain values of the static magnetic field the precession was suppressed at the point at which the magnetization lay in the sample plane. Time resolved images confirmed that coherent suppression had occurred at the center of the element, but nonuniformity was observed at the edges of the element, which became greater with decreasing aspect ratio. The nonuniform magnetization dynamics result from the dephasing of confined spin wave modes, suggesting that a more involved pulse shaping scheme may be required to coherently suppress the full mode spectrum.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Scott, Dr Jamie
• Authors: Barman, A., Kruglyak, V.V., Hicken, R.J., Scott, J., and Rahman, M.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Group: Solid State Physics
• Journal Name: Journal of Applied Physics
• Journal Abbr.: J. App. Phys.
• ISSN: 0021-8979
• ISSN (Online): 1089-7550
• Published Online: 28 April 2005

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
31412	1	Imaging high frequency magnetisation dynamics at the wafer level	Mahfuzur Rahman	Engineering & Physical Sciences Research Council (EPSRC)	GR/R73201/01	Physics and Astronomy