Reference : Optimal electron, phonon, and magnetic characteristics for low energy thermally induc...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching
Atxitia, U. [> >]
Ostler, Thomas mailto [Université de Liège > Département de physique > Physique des matériaux et nanostructures >]
Chantrell, R. W. [> >]
Chubykalo-Fesenko, O. [> >]
Applied Physics Letters
[en] electron-phonon coupling ; ultrafast magnetism ; magnetisation dynamics ; thermally induced magnetisation reversal
[en] Using large-scale computer simulations, we thoroughly study the minimum energy required to ther- mally induced magnetization switching (TIMS) after the application of a femtosecond heat pulse in transition metal-rare earth ferrimagnetic alloys. We find that for an energy efficient TIMS, a low ferrimagnetic net magnetization with a strong temperature dependence is the relevant factor for the magnetic system. For the lattice and electron systems, the key physics for efficient TIMS is a large electron-phonon relaxation time. Importantly, we show that as the cooling time of the heated elec- trons is increased, the minimum power required to produce TIMS can be reduced by an order of magnitude. Our results show the way to low power TIMS by appropriate engineering of magnetic heterostructures.
FP7 ; 281043 - FEMTOSPIN - Multiscale Modelling of Femtosecond Spin Dynamics

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