Two-magnon bound state causes ultrafast thermally induced magnetisation switching.

Abstract:

:There has been much interest recently in the discovery of thermally induced magnetisation switching using femtosecond laser excitation, where a ferrimagnetic system can be switched deterministically without an applied magnetic field. Experimental results suggest that the reversal occurs due to intrinsic material properties, but so far the microscopic mechanism responsible for reversal has not been identified. Using computational and analytic methods we show that the switching is caused by the excitation of two-magnon bound states, the properties of which are dependent on material factors. This discovery allows us to accurately predict the onset of switching and the identification of this mechanism will allow new classes of materials to be identified or designed for memory devices in the THz regime.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Barker J,Atxitia U,Ostler TA,Hovorka O,Chubykalo-Fesenko O,Chantrell RW

doi

10.1038/srep03262

subject

Has Abstract

pub_date

2013-11-20 00:00:00

pages

3262

issn

2045-2322

pii

srep03262

journal_volume

3

pub_type

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