dc.contributor.author | Keatley, Paul Steven | |
dc.contributor.author | Kruglyak, V.V. | |
dc.contributor.author | Neudert, A. | |
dc.contributor.author | Hicken, R.J. | |
dc.contributor.author | Poimanov, V.D. | |
dc.contributor.author | Childress, J.R. | |
dc.contributor.author | Katine, J.A. | |
dc.date.accessioned | 2015-09-23T12:59:19Z | |
dc.date.issued | 2015-05-07 | |
dc.description.abstract | Picosecond magnetization dynamics in the free and pinned layers of a microscale magnetic tunnel valve have been studied using time-resolved scanning Kerr microscopy. A comparison of the observed dynamics with those of individual free and pinned layers allowed the effect of interlayer coupling to be identified. A weak interlayer coupling in the tunnel valve continuous film reference sample was detected in bulk magnetometry measurements, while focused Kerr magnetometry showed that the coupling was well maintained in the patterned structure. In the tunnel valve, the free layer precession was observed to have reduced amplitude and an enhanced relaxation. During magnetization reversal in the pinned layer, its frequency approached that of the low frequency mode associated with the free layer. At the pinned layer switching field, the linewidth of the free layer became similar to that of the pinned layer. The similarity in their frequencies promotes the formation of precessional modes that exhibit strong collective properties such as frequency shifting and enhanced linewidth, while inhomogeneous magnetization of the pinned layer during reversal may also play a role in these observations. The collective character of precessional dynamics associated with mixing of the free and pinned layer magnetization dynamics must be accounted for even in tunnel valves with a small interlayer coupling. | en_GB |
dc.description.sponsorship | Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
dc.description.sponsorship | European Community's Seventh Framework Programme (FP7/2007-2013) | en_GB |
dc.identifier.citation | Vol. 117, article 17B301 | en_GB |
dc.identifier.doi | 10.1063/1.4907701 | |
dc.identifier.grantnumber | EP/C52022X/1 | en_GB |
dc.identifier.grantnumber | EP/D000572/1 | en_GB |
dc.identifier.grantnumber | EP/I038470/1 | en_GB |
dc.identifier.grantnumber | 247556 (NoWaPhen) | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/18308 | |
dc.language.iso | en | en_GB |
dc.publisher | American Institute of Physics (AIP) | en_GB |
dc.subject | Linewidths | en_GB |
dc.subject | Magnetic fields | en_GB |
dc.subject | Magnetization dynamics | en_GB |
dc.subject | Exchange interactions | en_GB |
dc.subject | Kerr effects | en_GB |
dc.title | Resonant enhancement of damping within the free layer of a microscale magnetic tunnel valve | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2015-09-23T12:59:19Z | |
dc.identifier.issn | 0021-8979 | |
dc.description | Copyright © 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics Vol. 117, article 17B301 and may be found at http://dx.doi.org/10.1063/1.4907701 | en_GB |
dc.identifier.eissn | 1089-7550 | |
dc.identifier.journal | Journal of Applied Physics | en_GB |